RT056 Ug R1520 V.1.0.4

Robustel R1520 User Guide
User Guide
R1520
Industrial Dual SIM Cellular VPN Router
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 1
Guangzhou Robustel Co., Ltd.

www.robustel.com
About This Document

This document provides hardware and software information of the Robustel High-speed intelligent LTE router R1520,
including introduction, installation, configuration and operation.
Copyright©2022 Guangzhou Robustel Co., Ltd.

All rights reserved.
Trademarks and Permissions

are trademark of Guangzhou Robustel Co., Ltd. All other trademarks and trade
names mentioned in this document are the property of their respective owners.
Disclaimer
No part of this document may be reproduced in any form without the written permission of the copyright owner.
The contents of this document are subject to change without notice due to continued progress in methodology,
design and manufacturing. Robustel shall have no liability for any error or damage of any kind resulting from the
inappropriate use of this document.
Technical Support
Tel: +86-20-82321505
Fax: +86-20-82321505
Email: support@robustel.com
Web: www.robustel.com
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 2

Important Notice
Due to the nature of wireless communications, transmission and reception of data can never be guaranteed. Data
may be delayed, corrupted (i.e., have errors) or be totally lost. Although significant delays or losses of data are rare
when wireless devices such as the router is used in a normal manner with a well-constructed network, the router
should not be used in situations where failure to transmit or receive data could result in damage of any kind to the
user or any other party, including but not limited to personal injury, death, or loss of property. Robustel accepts no
responsibility for damages of any kind resulting from delays or errors in data transmitted or received using the
router, or for failure of the router to transmit or receive such data.
Safety Precautions
General
 The router generates radio frequency (RF) power. When using the router, care must be taken on safety issues
related to RF interference as well as regulations of RF equipment.
 Do not use your router in aircraft, hospitals, petrol stations or in places where using cellular products is
prohibited.
 Be sure that the router will not be interfering with nearby equipment. For example: pacemakers or medical
equipment. The antenna of the router should be away from computers, office equipment, home appliance, etc.
 An external antenna must be connected to the router for proper operation. Only uses approved antenna with
the router. Please contact authorized distributor on finding an approved antenna.
 Always keep the antenna with minimum safety distance of 20 cm or more from human body. Do not put the
antenna inside metallic box, containers, etc.
 RF exposure statements
1. For mobile devices without co-location (the transmitting antenna is installed or located more than 20cm
away from the body of user and nearby person)
 FCC RF Radiation Exposure Statement
1. This Transmitter must not be co-located or operating in conjunction with any other antenna or transmitter.
2. This equipment complies with FCC RF radiation exposure limits set forth for an uncontrolled environment.
This equipment should be installed and operated with a minimum distance of 20 centimeters between the
radiator and human body.
Note: Some airlines may permit the use of cellular phones while the aircraft is on the ground and the door is open.
Router may be used at this time.
Using the Router in Vehicle

 Check for any regulation or law authorizing the use of cellular devices in vehicle in local country before installing
the router.
 The driver or operator of any vehicle should not operate the router while driving.
 Install the router by qualified personnel. Consult your vehicle distributor for any possible interference of
electronic parts by the router.
 The router should be connected to the vehicle’s supply system by using a fuse-protected terminal in the
vehicle’s fuse box.
 Be careful when the router is powered by the vehicle’s main battery. The battery may be drained after extended
period.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 3

Protecting Your Router

To ensure error-free usage, please install and operate your router with care. Do remember the following:
 Do not expose the router to extreme conditions such as high humidity / rain, high temperature, direct sunlight,
caustic / harsh chemicals, dust, or water.
 Do not try to disassemble or modify the router. There is no user serviceable part inside and the warranty would
be void.
 Do not drop, hit or shake the router. Do not use the router under extreme vibrating conditions.
 Do not pull the antenna or power supply cable. Attach/detach by holding the connector.
 Connect the router only according to the instruction manual. Failure to do it will void the warranty.
 In case of problem, please contact authorized distributor.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 4

Regulatory and Type Approval Information

Table 1: Directives
2011/65/EU The European RoHS2.0 2011/65/EU Directive was issued by the European parliament
and the European Council on 1 July 2011 on the restriction of the use of certain
Hazardous substances in electrical and electronic equipment.
2012/19/EU The European WEEE 2012/19/EU Directive was issued by the European parliament
and the European Council on 24 July 2012 on waste electrical and electronic equipment.
2013/56/EU The European 2013/56/EU Directive is a battery Directive which published in the EU official gazette
on 10 December 2013. The button battery used in this product conforms to the standard of
2013/56/EU directive.
Table 2: Standards of the electronic industry of the People’s Republic of China

SJ/T The electronic industry standard of the People's Republic of China SJ/T 11363-2006 “Requirements
11363-2006 for Concentration Limits for Certain Toxic and Hazardous Substances in Electronic Information
Products” issued by the ministry of information industry of the People's Republic of China on
November 6, 2006, stipulates the maximum allowable concentration of toxic and hazardous
substances in electronic information products.
Please see Table 3 for an overview of toxic or hazardous substances or elements that might be
contained in product parts in concentrations above the limits defined by SJ/T 11363-2006.
SJ/T The electronic industry standard of the People's Republic of China SJ/T 11364-2014 “Labeling
11364-2014 Requirements for Restricted Use of Hazardous Substances in Electronic and Electrical Products”
issued by the ministry of Industry and information technology of the People's Republic of China on
July 9, 2014, stipulates the Labeling requirements of hazardous substances in electronic and
electrical products, environmental protection use time limit and whether it can be recycled.
This standard is applicable to electronic and electrical products sold within the territory of the
People's Republic of China, and can also be used for reference in the logistics process of electronic
and electrical products.
The orange logo below is used for Robustel products:
Indicates its warning attribute, that is, some hazardous substances are contained in the product.
The "10" in the middle of the legend refers to the environment-friendly Use Period (EFUP) * of
electronic information product, which is 10 years. It can be used safely during the
environment-friendly Use Period. After the environmental protection period of use, it should enter
the recycling system.
*The term of environmental protection use of electronic information products refers to the term
during which the toxic and hazardous substances or elements contained in electronic information
products will not be leaked or mutated and cause serious pollution to the environment or serious
damage to people and property under normal conditions of use.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 5

Table 3: Toxic or Hazardous Substances or Elements with Defined Concentration Limits

Name of the Hazardous Substances
Part (Pb) (Hg) (Cd) (Cr(VI)) (PBB) (PBDE) (DEHP) (BBP) (DBP) (DIBP)
Metal parts o o o o - - - - - -
Circuit
o o o o o o o o o o
modules
Cables and
cable o o o o o o o o o o
assemblies
Plastic and
polymeric o o o o o o o o o o
parts
o:
Indicates that this toxic or hazardous substance contained in all of the homogeneous materials for this part is
below the limit requirement in RoHS2.0.
X:
Indicates that this toxic or hazardous substance contained in at least one of the homogeneous materials for this
part might exceed the limit requirement in RoHS2.0.
-:
Indicates that it does not contain the toxic or hazardous substance.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 6

Operating Frequency and Maximum Transmit Power for EU

Cellular frequency bands
Model: R1520-4L (V): B056708, R1520-4L Global: B056701
Technology Frequency Range Maximum transmit power
GSM850 824~849MHz, 869~894MHz 33dBm±2dB
EGSM900 880~915MHz, 925~960MHz 33dBm±2dB
DCS1800 1710~1785MHz, 1805~1880MHz 30dBm±2dB
PCS1900 1850~1910MHz, 1930~1990MHz 30dBm±2dB
WCDMA B1 1920~1980MHz, 2110~2170MHz 24dBm+1/-3dB
LTE FDD B1 1920~1980MHz, 2110~2170MHz 23dBm±2dB
LTE TDD B38 2570~2620MHz 23dBm±2dB
Model: R1520-4L (V): B056703

Technology Frequency Range Maximum transmit power
GSM 900 880~915MHz, 925~960MHz 33dBm±2dB
GSM 1800 1710~1785MHz, 1805~1880MHz 33dBm±2dB
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 7


LTE FDD B28A 703-733MHz, 758-788MHz 23dBm±2dB
Wi-Fi frequency bands

Frequency Range Maximum transmit power
2412 ~ 2484MHz 18.58dBm
The device is restricted to indoor use only when operating in the 5150 to 5350 MHz frequency range.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 8

Document History
Updates between document versions are cumulative. Therefore, the latest document version contains all updates
made to previous versions.
Date Firmware Version Document Version Change Description

Jun 11, 2020 3.1.0 v.1.0.0 Initial release.
Oct 15, 2020 3.1.0 v.1.0.1 1. Revise the maximum output current of DO.
2. Revise the description of DO.
3. Revise the picture of SIM Card Sticker.
May 28, 2021 3.1.9 v.1.0.2 1. Ethernet cable becomes optional material.
2. Revise the description of LED indicators.
3. Revise the description of cellular.
4. Add Smart Roaming.
5. Add Edge2Cloud.
Mar 31, 2022 3.1.13 v.1.0.3 1. Update company name and address.
2. Add transmitting band and power for EU.
Feb 27, 2023 5.0.0 V1.0.4 1. Optimized text description.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 9

Contents
Chapter 1 Product Overview ............................................................................................................................... 12
1.1 Introduction ....................................................................................................................................................... 12
1.2 Package Contents ...............................................................................................................................................12
1.3 Specifications ..................................................................................................................................................... 15
1.4 Dimensions ........................................................................................................................................................ 16
Chapter 2 Hardware Installation ..........................................................................................................................17
2.1 Definition of Power Interface ............................................................................................................................ 17
2.2 Interface Definition of 2 * 3 3.5mm .................................................................................................................. 17
2.3 Interface Definition of 2 * 4 3.5mm .................................................................................................................. 18
2.4 LED indicator ......................................................................................................................................................19
2.5 USB Interface ..................................................................................................................................................... 20
2.6 Reset Button ...................................................................................................................................................... 21
2.7 Ethernet Ports ....................................................................................................................................................21
2.8 Insert or Remove SIM Card ................................................................................................................................22
2.9 Attach External Antenna (SMA Type) ................................................................................................................ 23
2.10 Mount the Router ............................................................................................................................................ 24
2.11 Connect the Router to a Computer ................................................................................................................. 26
2.12 Power Supply ................................................................................................................................................... 26
2.13 DI/DO Interface ................................................................................................................................................27
2.14 AI Interface .......................................................................................................................................................28
Chapter 3 Initial Configuration ............................................................................................................................ 29
3.1 Configure the PC ................................................................................................................................................ 29
3.2 Factory Default Settings .....................................................................................................................................31
3.3 Log in the Router ............................................................................................................................................... 32
3.4 Control Panel ..................................................................................................................................................... 32
Chapter 4 Router Configuration ...........................................................................................................................35
4.1 Status ................................................................................................................................................................. 35
4.1.1 System Information .................................................................................................................................35
4.1.2 Internet Status ........................................................................................................................................ 36
4.1.3 LAN Status ...............................................................................................................................................36
4.2 Interface .............................................................................................................................................................37
4.2.1 Link Manager .......................................................................................................................................... 37
4.2.2 LAN ..........................................................................................................................................................48
4.2.3 Ethernet .................................................................................................................................................. 52
4.2.4 Cellular .................................................................................................................................................... 53
4.2.5 WiFi ......................................................................................................................................................... 58
4.2.6 USB ..........................................................................................................................................................66
4.2.7 DI/DO ...................................................................................................................................................... 67
4.2.8 AI ............................................................................................................................................................. 71
4.2.9 Serial Port ................................................................................................................................................73
4.3 Network ............................................................................................................................................................. 77
4.3.1 Route .......................................................................................................................................................77
4.3.2 Firewall ....................................................................................................................................................79
4.3.3 IP Passthrough ........................................................................................................................................ 84
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 10

4.4 VPN .................................................................................................................................................................... 85

4.4.1 IPsec ........................................................................................................................................................ 85
4.4.2 OpenVPN ................................................................................................................................................ 93
4.4.3 GRE ........................................................................................................................................................106
4.5 Services ............................................................................................................................................................ 107
4.5.1 Syslog .................................................................................................................................................... 107
4.5.2 Event ..................................................................................................................................................... 108
4.5.3 NTP ........................................................................................................................................................112
4.5.4 SMS ....................................................................................................................................................... 113
4.5.5 Email ..................................................................................................................................................... 114
4.5.6 DDNS .....................................................................................................................................................115
4.5.7 SSH ........................................................................................................................................................ 116
4.5.8 GPS (Optional) ...................................................................................................................................... 117
4.5.9 Web Server ........................................................................................................................................... 122
4.5.10 Advanced ............................................................................................................................................ 123
4.5.11 Smart Roaming ................................................................................................................................... 124
4.6 System ..............................................................................................................................................................128
4.6.1 Debug ....................................................................................................................................................128
4.6.2 Update .................................................................................................................................................. 129
4.6.3 App Center ............................................................................................................................................ 129
4.6.4 Tools ......................................................................................................................................................130
4.6.5 Profile ....................................................................................................................................................133
4.6.6 User Management ................................................................................................................................ 135
4.7 Edge2cloud ...................................................................................................................................................... 136
4.7.1 Edge2cloud ........................................................................................................................................... 136
4.7.2 E2C Broker .............................................................................................................................................136
Chapter 5 Configuration Examples .....................................................................................................................139
5.1 Cellular ............................................................................................................................................................. 139
5.1.1 Cellular Dial-Up .....................................................................................................................................139
5.1.2 SMS Remote Control .............................................................................................................................141
5.2 VPN Configuration Example .............................................................................................................................143
5.2.1 IPsec VPN .............................................................................................................................................. 143
5.2.2 OpenVPN .............................................................................................................................................. 147
5.2.3 GRE VPN ................................................................................................................................................149
Chapter 6 Introductions for CLI ..........................................................................................................................151
6.1 What Is CLI ....................................................................................................................................................... 151
6.2 How to Configure the CLI .................................................................................................................................153
6.3 Commands Reference ......................................................................................................................................153
6.4 Quick Start with Configuration ExampleS ........................................................................................................154
Glossary ........................................................................................................................................................... 161
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 11

Chapter 1 Product Overview
1.1 Introduction
The Robustel industrial dual SIM cellular VPN router (R1520) is a rugged cellular router can support 2G, 3G, and 4G
LTE Cat 4 networks. It provides high-speed wireless network bandwidth for devices through wireless connections to
ensure stable wireless network connections.
R1520 is a powerful router developed from RobustOS, a Robustel self-developed and Linux-based operating system
which is designed to be used in Robustel devices. The RobustOS includes basic networking features and protocols
providing customers with a very good customized user experience, which is more diverse, convenient, and practical.
Meanwhile, Robustel offers a Software Development Kit (SDK) for partners and customers to allow additional
customization by using C. It also provides rich Apps to meet fragmented IoT market demands.
1.2 Package Contents
Before installing your R1520 Router, verify the kit contents as following.
Note: The following pictures are for illustration purposes only, not based on their actual sizes.
 1 x Robustel R1520 High-speed intelligent LTE router
 1 x 2-pin 3.5 mm male terminal block with lock for power supply
 1 x 2*4-pin 3.5 mm male terminal block for serial port
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 12

 1 x 2*3-pin 3.5 mm male terminal block for DI/DO/AI interface
 1 x SMA-J cellular antenna (rubber antenna)
 1 x RP-SMA-J WiFi antenna (rubber antenna)
 1 x SIM Card Sticker
 Optional Accessories (sold separately)
 Ethernet cable
 SMA-J cellular antenna (rubber antenna or Magnet antenna is optional）

rubber antenna Magnet antenna
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 13

 RP-SMA-J WiFi antenna (rubber antenna or Magnet antenna is optional）

rubber antenna Magnet antenna
 SMA-J GPS antenna (Magnetic or adhesive is optional)
 35 mm DIN Rail mounting kit
 AC/DC power adapter (12V DC，1.5 A；EU/US/UK/AU plug optional)
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 14

1.3 Specifications
Cellular Interface
 Number of antennas: 2 (MAIN + AUX)
 Connector: SMA-K
 SIM: 2 , Mini-SIM or eSIM
 Standards: FDD LTE/TDD LTE, backward compatible to 2G/3G
Ethernet Interface
 Number of ports: 5 x 10/100 Mbps (It can be configured as 5x LAN or 4 x LAN + 1 x WAN)
 ETH0 port: supports 802.3at PD function
 Magnet isolation protection: 1.5 KV
WiFi Interface
 Number of antennas: 2 (WiFi1 + WiFi2)
 Connector: RP-SMA-K
 Standards: 802.11b/g/n, 2*2 MIMO, supports AP and Client modes
 Frequency bands: 2.4GHz
 Security: Open、WPA、WPA2、WEP
 Encryption: AES、TKIP、WEP64
 Data speed: Maximum rate is 300 Mbps
GPS Interface (Optional, depending on the cellular module)

 Number of antennas: 1
 Connector: SMA-K, 50 ohm characteristic impedance
 Positioning technology: GPS, QZSS, GLONASS, Galileo, BeiDou
Serial Interface
 Number of ports: 1 x RS232 and 1 x RS485
 Connector: 2 *4-pin 3.5 mm female socket
 ESD protection: ±8 KV Air
 RS232: TxD, RxD, RTS, CTS, SGND
 RS485: Data+ (A), Data- (B)
DI/DO
 Type: 1 x DI (wet contact) + 1 x DO (wet contact)
 Connector: 2*3-pin 3.5 mm female socket
 Isolation: 3KVDC
 Absolute maximum: + 30 V DC
 Maximum input current of DI: 10 mA
 Maximum output current of DO: 10 mA
Analog Input
 Type: 1 x AI
 Connector: 2*3-pin 3.5 mm female socket(Shared with DI / DO)
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 15

 Measuring range: 4 ~ 20mA / 0 ~ 24V
Others
 1 x Reset button (Tact Switch)
 1 x 480 Mbps high-speed USB 2.0 interface (host mode), Type A, 5V / 500 mA
 LED indicators - 1 x RUN, 1 x Modem, 1 x USR, 1 x WiFi, 1 x RSSI
Power Supply and Consumption

 Connector: 2-pin 3.5 mm female socket with lock
 Input voltage: 9 to 36V DC
 Power consumption: Idle: 100 mA@12 V;
Data link: 1000 mA (peak) @12 V
Physical Characteristics
 Ingress protection: IP30
 Housing & Weight: Plastic, 250 g
 Dimensions: 105mm (length) x 90mm(width) x 46mm(thickness)
 Installations: Desktop, wall mounting or DIN rail mounting (Wall mounting and Din rail mounting installation
requires additional installation accessories)
 Operating Temperature: -25~+70 °C
 Storage Temperature: -40~+85 °C
 Relative Humidity: 5~95% RH
1.4 Dimensions
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 16

Chapter 2 Hardware Installation
2.1 Definition of Power Interface
PIN Description Note

1 V+ Positive
2 V- Negative
2.2 Interface Definition of 2 * 3 3.5mm
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 17

PIN DI DO AI Note
1 IN -- Digital input positive
2 -- OUT -- Digital output positive
3 -- -- AI Analog input
4 IGND -- -- Digital input negative
5 -- OGND -- Digital output negative
Analog input signal

6 -- -- AGND
ground
2.3 Interface Definition of 2 * 4 3.5mm
PIN RS232 RS485 Note
1 TXD -- Router  Device
2 RTS -- Router  Device
3 -- GND RS485 signal ground
4 B RS485 Data+ (B)
5 RXD -- Router  Device
6 CTS -- Router  Device
7 SGND -- RS232 signal ground
8 -- A RS485 Data+ (A)
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 18

2.4 LED indicator
Name Color Status Description
On, solid Router is powered on (System is initializing)

RUN Green On, blinking Router starts operating
Off Router is powered off
On, solid Link connection is working
MDM Green On, blinking Data is sent and received.
Off Link connection is not working
On, solid OpenVPN connection is established
USR-OpenVPN Green
Off OpenVPN connection is not established
USR
On, solid IPsec connection is established
USR-IPsec Green
Off IPsec connection is not established
Received Signal Strength Indication greater than -73 dBm
Green On, solid
(Strong signal)
Received Signal Strength Indication -91 to -73 dBm
Green On, blinking
RSSI (Moderate signal)
Received Signal Strength Indication -111 to -93dBm (Weak
Green Off
signal)
Green Off No signal
Green On, solid WiFi is enabled and working properly
WLAN
Green Off WiFi is disabled or not working properly
Note: 1. click Services > Advanced > system > System Settings > Custom LED Indicator type to set the display type of
USR LED.
2. When the LEDs start blinking one by one, the WLAN indicator will not turn on and off.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 19

2.5 USB Interface
Function Operation
The USB interface can be used for batch firmware upgrades, but it cannot
send or receive data with slave devices connected to the USB interface. The
Firmware user can insert a USB storage device, such as a U disk or a hard disk, at the
upgrade USB interface. If there is a configuration file or router firmware in the USB
storage device, the router will automatically update the configuration file or
firmware. For details, please refer to "4.2.6 USB".
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 20

2.6 Reset Button
Function Operation
Reboot Press and hold the RST button for 2 to 7 seconds under the operating status.
Restore to factory Wait for 0~20 seconds after powering up the router, press and hold the RST button with a
default settings pointed bar until all five LEDs start blinking one by one, and release the button to return the
router to factory defaults.
2.7 Ethernet Ports
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 21

There are five Ethernet ports on R1520, including ETH0 (POE), ETH1, ETH2, ETH3 and ETH4. Each has two LED
indicators. The green one is a link indicator but the yellow one doesn’t mean anything. For details about status, see
the table below.
Indicator Status Description

Link indicator On, solid Connection is established
(Green) On, blinking Data is being transferred
Off Connection is not established
2.8 Insert or Remove SIM Card
Insert or remove the SIM card as shown in the following steps.

 Insert SIM card
1. Make sure router is powered off.
2. To insert SIM card, press the card with finger until you hear a click.
3. After the SIM card is inserted, attach the SIM card sticker to the card slot.
 Remove SIM card

1. Make sure router is powered off.
2. Tear the SIM card sticker from the slot.
3. To remove SIM card, press the SIM card with finger until you hear a click and it pops out and then take out the
card.
Note:
1. Use the specific M2M SIM card when the device is working in extreme temperature, because the regular card for
long-time working in harsh environment will be disconnected frequently.
2. Do not touch the metal of the card surface in case information in the card will lose or be destroyed.
3. Do not bend or scratch the card.
4. Keep the card away from electricity and magnetism.
5. Make sure router is powered off before inserting or removing the card.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 22

2.9 Attach External Antenna (SMA Type)
Attach an external SMA antenna to the router’s antenna connector and twist tightly. Make sure the antenna is within
the correct frequency range provided by the ISP and with 50 Ohm impedance.
Note: Recommended torque for tightening is 0.35 N.m.
RP-SMA-K antenna for

WLAN connection
SMA-K antenna for cellular

connection (When there is
only one antenna, it is
connected to MAIN)
RP-SMA-K antenna for

WLAN connection
SMA-K antenna for SMA-K antenna for

cellular connection GPS connection
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 23

2.10 Mount the Router
The router can be placed on a desktop or mounted to a wall or a 35 mm DIN rail.
Two methods for mounting the router

1. Wall mounting (measured in mm)
First, drill holes on the wall, the distance between the two holes is 60mm, then knock the expansion pipe into the
wall with a rubber hammer, align the screw with the expansion pipe, insert the screw and reserve the corresponding
length, and finally fix the product on the wall.
Note: Recommended torque for mounting is 1.0 N.m, and the maximum allowed is 1.2 N.m.
2. DIN rail mounting (measured in mm)

Option 1: Vertical installation
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 24

Use 3 pcs of M3*8 Black cross recessed countersunk head tapping screws to mount the router on the DIN rail, and
then hang the DIN rail on the holder. You need to choose a standard holder.
Option 2: Horizontal installation
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 25

Use 3 pcs of M3*8 Black cross recessed countersunk head tapping screws to mount the router on the DIN rail, and
then hang the DIN rail on the holder. You need to choose a standard holder.
2.11 Connect the Router to a Computer
Connect the Ethernet port (ETH1 ~ ETH4) of the router to a PC with a standard crossover cable.
2.12 Power Supply
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 26

PIN Description Note

Power supply
1 Connect the adapter or battery positive (red wire)
Positive
Power supply
2 Connect the adapter or battery negative (black wire)
negative
2.13 DI/DO Interface
R1520 supports 1 channel DI and 1 channel DO, the internal schematic diagram is as shown above;
1. DI application
R1520 DI input is internally isolated by opt coupler, internal current-limiting design, within the working level of 0 ~
30V, external input does not need current limiting, DI input logic level range is as follows:
Logic 1 level range: min 3.5 V to max 30 V;
Logic 0 level range: min 0 V to max 1 V;
The application example is as follows:
2. DO application
R1520 DO output is internally isolated by opt ocoupler, OUT is OC gate output, Normal use requires external resistor
pull-up, the pull-up voltage range is 3V ~ 30V (for actual use, please consult Technical Support Engineer for selection
of pull-up resistor);
The application example is as follows:
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 27

2.14 AI Interface
R1520 supports one channel AI interface for analog signal voltage and current measurement;
1. 0 ~ 24V voltage measurement, wiring as shown below:
2. 4 ~ 20mA current signal measurement requires an external parallel 1.2kohm resistor, wiring as shown below:
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 28

Chapter 3 Initial Configuration

The router can be configured through your web browser that including IE 8.0 or above, Chrome and Firefox, etc. A
web browser is included as a standard application in the following operating systems: Linux, Mac OS, Windows
98/NT/2000/XP/Me/Vista/7/8, etc. It provides an easy and user-friendly interface for configuration. There are various
ways to connect the router, either through an external repeater/hub or connect directly to your PC. However, make
sure that your PC has an Ethernet interface properly installed prior to connecting the router. You must configure your
PC to obtain an IP address through a DHCP server or a fixed IP address that must be in the same subnet as the router.
If you encounter any problems accessing the router web interface, it is advisable to uninstall your firewall program on
your PC, as this tends to cause problems accessing the IP address of the router.
3.1 Configure the PC
There are two methods to get IP address for the PC. One is to obtain an IP address automatically from “Local Area
Connection”, and another is to configure a static IP address manually within the same subnet of the router. Please
refer to the steps below.
Here take Windows 7 as example, and the configuration for windows system is similar.
1. Click Start > Control Panel, double-click Network and Internet, and then double-click Network Connections.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 29

2. Click Properties in the window of Local Area Connection Status.
3. Choose Internet Protocol Version 4 (TCP/IPv4) and click Properties.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 30

4. Two ways for configuring the IP address of PC

Obtain an IP address from the DHCP server automatically; Click “Obtain an IP address automatically ";
Use the following IP address:

(Configured a static IP address manually within the same subnet of the router, click and configure "Use the following
IP address"
5. Click OK to finish the configuration.
3.2 Factory Default Settings
Before configuring your router, you need to know the following default settings.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 31

Item Description
Username admin
Password admin
ETH0/POE Default WAN mode
ETH1 192.168.0.1/255.255.255.0, LAN mode
ETH2 192.168.0.1/255.255.255.0, LAN mode
ETH3 192.168.0.1/255.255.255.0, LAN mode
ETH4 192.168.0.1/255.255.255.0, LAN mode
DHCP Server Enabled
3.3 Log in the Router
To log in to the management page and view the configuration status of your router, please follow the steps below.
1. On your PC, open a web browser such as Internet Explorer and Google, etc.
2. From your web browser, type the IP address of the router into the address bar and press enter. The default IP
address of the router is http://192.168.0.1/, though the actual address may vary.
3. In the login page, enter the username and password, choose language and then click LOGIN. The default
username and password are “admin”.
Note: If enter the wrong username or password over 6 times, the login web will be locked for 5 minutes.
3.4 Control Panel
After successfully logging into the R1520 router, the home page is as shown in the figure below:
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 32

In the home page, the user can save the configuration, restart the router, log out, and so on.
Using the original username and password to log in the router, the page will pop up the following tab.
It is strongly recommended for security purposes that you change the default username and/or password.
Click the to close the popup. To change your username and/or password, see 4.6.6 User Management.
Control Panel
Item Description Button
Save & Apply Click to save the current configuration into router’s flash and apply the
modification on every configuration page, to make the modification
taking effect.
Reboot Click to reboot the router. If the Reboot button is yellow, it means that
some completed configurations will take effect only after reboot.
Logout Click to log the current user out safely. After logging out, it will switch to
login page. Shut down web page directly without logout, the next one can
login web on this browser without a password before timeout.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 33

Submit Click to save the modification on current configuration page.
Cancel Click to cancel the modification on current configuration page.
Note: The steps of how to modify configuration are as bellow:

1. Modify in one page;
2. Click under this page;
3. Modify in another page;
4. Click under this page;
5. Complete all modification;
6. Click .
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 34

Chapter 4 Router Configuration
4.1 Status
4.1.1 System Information
This section allows you to view the System Information of your Router.
System Information
Item Description
Device Model Show the model name of your device.
System Uptime Show the current amount of time the router has been connected.
System Time Show the current system time.
RAM Usage Show the free memory and the total memory.
Firmware Version Show the firmware version running on the router.
Hardware Version Show the current hardware version.
Kernel Version Show the current kernel version.
Serial Number Show the serial number of your device, from which you can get information such as the
router's time of delivery.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 35

4.1.2 Internet Status
This section shows the Internet status information of your Router.
Internet Status
Item Description
Active Link Show the current active link. WWAN1, WWAN2, WAN or WLAN.
Uptime Show the current amount of time the link has been connected.
IP Address Show the IP address of current link.
Gateway Show the gateway address of the current link.
DNS Show the current primary DNS server and secondary server.
4.1.3 LAN Status
This section shows the router's LAN status information.
LAN Status
Item Description
IP Address Show the IP address and the Netmask of the router.
MAC Address Show the MAC address of the router.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 36

4.2 Interface
4.2.1 Link Manager
This section allows you to setup the connection of Link Manager. Link manager is a network link backup function that
provides mobile network and Ethernet link backups.
General Settings @ Link Manager

Item Description Default
Primary Link Select from “WWAN1”, “WWAN2”, “WAN” or “WLAN”. WWAN1
 WWAN1: Select to make SIM1 as the primary wireless link
 WWAN1: Select to make SIM2 as the primary wireless link
 WAN: Select to make WAN as the primary wired link
 WLAN: Select to make WLAN as the primary wireless link
Note: WLAN link is available only if enable WiFi as Client mode, please
refer to 4.2.5 WiFi.
Backup Link Select from “WWAN1” , “WWAN2”, “WAN” or “None”. WWAN2
 WWAN1: Select to make SIM1 as the backup wireless link
 WWAN2: Select to make SIM2 as the backup wireless link
 WAN: Select to make WAN as the backup wired link
 WLAN: Select to make WLAN as the backup wireless link
Note: WLAN link is available only if enable WiFi as Client mode, please
refer to 4.2.5 WiFi.
 None: Do not select any backup link
Backup Mode Select from “Cold Backup”, “Warm Backup” or “Load Balancing”. Cold
 Cold Backup: The inactive link is offline on standby Backup
 Warm Backup: The inactive link is online on standby
Note: Warm backup mode is not available for dual SIM backup.
 Load Balancing: Use two links simultaneously
Revert Interval Specify the number of minutes that elapses before the primary link is 0
checked if a backup link is being used in cold backup mode. 0 means disable
checking.
Note: Revert interval is available only under the cold backup mode.
Emergency Reboot Click the toggle button to enable/disable this option. Enable to reboot the OFF
whole system if no links available.
Note: Click for help.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 37

Link Settings allows you to configure the parameters of link connection, including WWAN1, WWAN2, WAN and
WLAN. It is recommended to enable Ping detection to keep the router always online. The Ping detection increases
the reliability and also costs the data traffic.
Click on the right-most of WWAN1/WWAN2/WAN/WLAN to enter the configuration window.
WWAN1/ WWAN2
The window is displayed as below when enabling the “Automatic APN Selection” option.
The window is displayed as below when disabling the “Automatic APN Selection” option.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 38

Link Settings (WWAN)

General Settings
Index Indicate the ordinal of the list. --
Type Show the type of the link. WWAN1
Description Enter a description for this link. It can be null. Null
WWAN Settings
Automatic APN Click the toggle button to enable/disable the “Automatic APN Selection” ON
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 39


Selection option. After enabling, the device will recognize the access point name
automatically. Alternatively, you can disable this option and manually add
the access point name.
APN Enter the Access Point Name for cellular dial-up connection, provided by internet
local ISP.
Username Enter the username for cellular dial-up connection, provided by local ISP. Null
Password Enter the password for cellular dial-up connection, provided by local ISP. Null
Dialup Number Enter the dialup number for cellular dial-up connection, provided by local *99***1#
ISP.
Authentication Type Select from “Auto”, “PAP” or “CHAP” as the local ISP required. Auto
Switch SIM By Data Click the toggle button to enable/disable this option. After enabling, it will
Allowance switch to another SIM when the data limit reached. OFF
Note: Only used for dual SIM backup.
Data Allowance Set the monthly data traffic limitation. The system will record the data 0
traffic statistics when data traffic limitation (MiB) is specified. The traffic
record will be displayed in Interface > Link Manager > Status > WWAN
Data Usage Statistics. 0 means disable data traffic record.
Billing Day Specify the monthly billing day. The data traffic statistics will be 1
recalculated from that day.
Ping Detection Settings
Enable Click the toggle button to enable/disable the ping detection mechanism, a ON
keep-alive policy of the router.
Primary Server Router will ping this primary address/domain name to check that if the 8.8.8.8
current connectivity is active.
Secondary Server Router will ping this secondary address/domain name to check that if the 114.114.11
current connectivity is active. 4.114
Ping Interval Set the ping interval. 300
Ping Retry Interval Set the ping retry interval. When ping failed, the router will ping again 5
every retry interval.
Ping Timeout Set the ping timeout. 3
Max Ping Tries Set the max ping tries. Switch to another link or take emergency action if 3
the max continuous ping tries reached.
Advanced Settings
NAT Enable Click the toggle button to enable/disable the Network Address Translation ON
option.
Upload Bandwidth Set the upload bandwidth used for QoS, measured in kbps. 10000
Download Bandwidth Set the download bandwidth used for QoS, measured in kbps. 10000
Overrided Primary Override primary DNS will override the automatically obtained DNS. Null
DNS
Overrided Secondary Override secondary DNS will override the automatically obtained DNS. Null
DNS
Debug Enable Click the toggle button to enable/disable this option. Enable for debugging ON
information output.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 40


Verbose Debug Enable Click the toggle button to enable/disable this option. Enable for verbose OFF
debugging information output.
WAN
Router will obtain IP automatically from DHCP server if choosing “DHCP” as connection type. The window is
displayed as below.
The window is displayed as below when choosing “Static” as the connection type.
The window is displayed as below when choosing “PPPoE” as the connection type.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 41

RT056_UG_R1520_v.1.0.4 Feb 27, 2023 42

Link Settings (WAN)

General Settings
Type Show the type of the link. WAN
Connection Type Select from “DHCP”, “Static” or “PPPoE”. DHCP
Static Address Settings
IP Address Set the IP address with Netmask which can access the internet. Null
IP address with Netmask, e.g. 192.168.1.1/24
Router Set the router of the IP address in WAN port. Null
Primary DNS Set the primary DNS. Null
Secondary DNS Set the secondary DNS. Null
PPPoE Settings
Username Enter the username provided by your Internet Service Provider. Null
Password Enter the password provided by your Internet Service Provider. Null
Authentication Type Select from “Auto”, “PAP” or “CHAP” as the local ISP required. Auto
PPP Expert Options Enter the PPP Expert options used for PPPoE dialup. You can enter some Null
other PPP dial strings in this field. Each string can be separated by a
semicolon.
WAN Settings
Data Allowance Set the monthly data traffic limitation. The system will record the data OFF
traffic statistics when data traffic limitation (MiB) is specified. The traffic
record will be displayed in Interface > Link Manager > Status > WWAN
Data Usage Statistics. 0 means disable data traffic record.
Billing Day Specify the monthly billing day. The data traffic statistics will be 1
recalculated from that day. If not set, traffic will not be counted.
keep-alive policy of the router.
Interval Set the ping interval. 300
Retry Interval Set the ping retry interval. When ping failed, the router will ping again 5
Timeout Set the ping timeout. 3
Advanced Settings
option.
MTU Enter the Maximum Transmission Unit. 1500
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 43

Upload Bandwidth Enter the upload bandwidth used for QoS, measured in kbps. 10000
Download Bandwidth Enter the download bandwidth used for QoS, measured in kbps. 10000
Overrided Primary DNS Override primary DNS will override the automatically obtained DNS. Null
DNS
information output.
WLAN
Router will obtain IP automatically from the WLAN AP if choosing “DHCP” as the connection type. The specific
parameter configuration of SSID is shown as below.
The window is displayed as below when choosing “Static” as the connection type.
R1520 does not support "PPPoE" WLAN connection types.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 44

Link Settings (WLAN)

General Settings
Type Show the type of the link. WLAN
Connection Type Select from “DHCP” or “Static”. DHCP
WLAN Settings
SSID Enter a 1-32 characters SSID which your router wants to connect. SSID router
(Service Set Identifier) is the name of your wireless network.
Connect to Hidden SSID Click the toggle button to enable/disable this option. When router works OFF
as Client mode and needs to connect any access point which has hidden
SSID, you need to enable this option.
Password Enter an 8-63 characters password of the access point which your router Null
wants to connect.
Static Address Settings
IP Address Enter the IP address with Netmask which can access the Internet, Null
e.g. 192.168.1.1/24
Gateway Enter the IP address of WiFi AP. Null
Primary DNS Set the primary DNS. Null
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 45

Secondary DNS Set the secondary DNS. Null

keepalive policy of the router.
Interval Set the ping interval. 300
Retry Interval Set the ping retry interval. When ping failed, the router will ping again 5
Timeout Set the ping timeout. 3
Advance Settings
option.
Upload Bandwidth Enter the upload bandwidth used for QoS, measured in kbps. 10000
Download Bandwidth Enter the download bandwidth used for QoS, measured in kbps. 10000
Overrided Primary DNS Override primary DNS will override the automatically obtained DNS. Null
DNS
information output.
Status
This page allows you to view the status of link connection and clear the monthly data usage statistics.
Click the right-most button to select the connection status of the current link.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 46

Click the row of the link, and it will show the details information of the current link connection under the row.
WWAN usage data statistics and WAN usage data statistics respectively count the packet flow of the cellular module
and WAN.
Click the button to clear the monthly data traffic usage statistics of SIM1 or SIM2. Data statistics will be
displayed only if enable the Data Allowance function in Interface > Link Manager > Link Settings >
WWAN1/WWAN2/WAN Settings > Data Allowance .
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 47

4.2.2 LAN
This section allows you to set the related parameters for LAN port. When ETH0 is configured as WAN, the router has
four LAN ports, ETH1, ETH2, ETH3, and ETH4. The ETH1, ETH2, ETH3 and ETH4 can freely choose from lan0, lan1, lan2
and lan3. When ETH0 is configured as LAN, the router has five LAN ports, ETH0, ETH1, ETH2, ETH3, and ETH4. The
ETH0, ETH1, ETH2, ETH3 and ETH4 can freely choose from lan0, lan1, lan2, lan3 or lan4. Whether it is four LAN ports
or five LAN ports, lan0 must be selected by at least one LAN port. The default settings of ETH1/ETH2/ETH3/ETH4 are
lan0 and their default IP are 192.168.0.1/255.255.255.0.
LAN
Note: Lan0 cannot be deleted.
You may click to add a new LAN port, or click to delete the current LAN port. Now, click to edit the
configuration of the LAN port.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 48

General Settings @ LAN

Interface Show the editing port. lan0
Note: Lan1 is available only if it was selected by one of ETH1~ETH4 in
Ethernet > Ports > Port Settings.
IP Address Set the IP address of the LAN port. 192.168.0.1
Netmask Set the Netmask of the LAN port. 255.255.255.0
The window is displayed as below when choosing “Server” as the mode.
The window is displayed as below when choosing “Relay” as the mode.
LAN
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 49


DHCP Settings
Enable Click the toggle button to enable/disable the DHCP function. ON
Mode Select the mode of DHCP from “Server” or “Relay”. Server
 Server: Lease IP address to DHCP clients which have been
connected to LAN port
 Relay: Router can be DHCP Relay, which will provide a relay
tunnel to solve problem that DHCP Client and DHCP Server is not
in a same subnet
IPv4 Pool Start Define the beginning of the pool of IP addresses which will be leased 192.168.0.2
to DHCP clients.
IPv4 Pool End Define the end of the pool of IP addresses which will be leased to 192.168.0.100
DHCP clients.
Subnet Mask Define the subnet mask of IP address obtained by DHCP clients from 255.255.255.0
DHCP server.
DHCP Server for Relay Enter the IP address of DHCP relay server. Null
DHCP Advanced Settings
Router Define the router assigned by the DHCP server to the clients, which Null
must be on the same network segment with DHCP address pool.
Primary DNS Override primary DNS will override the automatically obtained DNS. Null
Secondary DNS Define the secondary DNS server assigned by the DHCP server to Null
the Override secondary DNS will override the automatically obtained
DNS.
WINS Server Define the Windows Internet Naming Service obtained by DHCP Null
clients from DHCP sever.
Lease Time Set the lease time which the client can use the IP address obtained 120
from DHCP server, measured in seconds.
Static lease Bind a lease to correspond an IP address via a MAC address. Null
format: mac,ip;mac,ip;..., e.g. FF:ED:CB:A0:98:01,192.168.0.200
Expert Options Enter some other options of DHCP server in this field. Null
format: config-desc;config-desc, e.g. log-dhcp;quiet-dhcp
Debug Enable Click the toggle button to enable/disable this option. Enable for DHCP OFF
information output.
Multiple IP
You may click to edit the multiple IP of the LAN port, or click to delete the multiple IP of the LAN port. Now,
click to add a new multiple IP of the LAN port.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 50

IP Settings
Interface Show the editing port, read only. --
IP Address Set the multiple IP address of the LAN port. Null
Netmask Set the multiple Netmask of the LAN port. Null
Status
This section allows you to view the status of LAN connection.
Click the row of status, the details status information will be display under the row.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 51

4.2.3 Ethernet
This section allows you to set the related parameters for Ethernet. There are five Ethernet ports on R1520 Router,
including ETH0, ETH1, ETH2, ETH3 and ETH4 . ETH0 can be configured as the WAN port for the router to access the
outer network or the LAN port for the lower end devices to connect with the router. ETH1, ETH2, ETH3 and ETH4 can
only be configured as a LAN port for the lower device to connect to the router. The default factory settings of ETH0 is
Wan. ETH1, ETH2, ETH3 and ETH4 are lan0, and the default IP is 192.168.0.1/255.255.255.0.
Click the button on the right-most of eth1 to change the port parameters in the port window that pops up.
Port Settings
Port Show the editing port, read only. --
Port Assignment Choose the Ethernet port’s type, as a WAN port or a LAN port. When setting the lan0
port as a LAN port in Interface > LAN > LAN > Network Settings > General Settings,
you can click the drop-down list to select from “lan0”, “lan1”, “lan2” or“lan3”
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 52

Click the status column to view the connection status of all Ethernet ports.
Click the row of status, the details status information will be display under the row. Please refer to the screenshot
below.
4.2.4 Cellular
This section allows you to set the related parameters of Cellular. The R1520 Router has two SIM card slot. When
inserting a single SIM card for the first time, both Sim1 and sim2 slots are available.
Click the right most button of SIM 1 to edit the parameters.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 53

The window is displayed as below when choosing “Auto” as the network type.
The window is displayed as below when choosing “Specify” as the band select type.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 54

Cellular
General Settings
SIM Card Set the currently editing SIM card. SIM1
Phone Number Enter the phone number of the SIM card. Null
PIN Code Enter a 4-8 characters PIN code used for unlocking the SIM. Null
Extra AT Cmd Enter the AT commands used for cellular initialization. Null
Telnet Port Specify the Port listening of telnet service, used for AT over Telnet. 0
Cellular Network Settings
Network Type Select from “Auto”, “4G Only”, “4G First”. Auto
 Auto: Connect to the best signal network automatically
 4G Only: Only the 4G network is connected
 4G First: Connect to the 4G Network preferentially
Band Select Type Select from “All” or “Specify”. You may choose certain bands if choosing All
“Specify”.
Advanced Settings
information output.
Verbose Debug Click the toggle button to enable/disable this option. Enable for verbose OFF
Enable debugging information output.
This section allows you to view the status of the cellular connection.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 55

Click the row of status, the details status information will be displayed under the row.
Status
Item Description
Index Indicate the ordinal of the list.
Modem Status Show the status of the radio module.
Modem Model Show the model of the radio module.
Current SIM Show the SIM card that your router is using: SIM1 or SIM2.
Phone Number Show the phone number of the current SIM.
Note: This option will be displayed if enter manually in Cellular > Advanced Cellular
Settings > SIM1 > General Settings > Phone Number.
IMSI Show the IMSI number of the current SIM.
ICCID Show the ICCID number of the current SIM.
Registration Show the current network status.
Network Provider Show the name of Network Provider.
Network Type Show the current network service type, e.g. GPRS.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 56

Status
Item Description
Band Show the band of the current network.
Signal Strength Show the signal strength.
RSRP Show the Reference Signal Received Power. (Only valid for 4G network)
RSRQ Show the Reference Signal Received Quality. (Only valid for 4G network)
SINR Show the Signal to Interference plus Noise Ratio. (Only valid for 4G network)
EC/IO Show EC/IO when registering to 3G networks.
Bit Error Rate Show the current bit error rate.
PLMN ID Show the current PLMN ID.
Local Area Code Show the current local area code used for identifying different area.
Community ID Show the current Community ID used for locating the router.
IMEI Show the IMEI (International Mobile Equipment Identity) number of the radio
module.
Firmware Version Show the current firmware version of the radio module.
Click the "AT Debug" to detect the AT command.
AT Debug
Command Enter the AT command that you want to send to cellular module in this Null
text box.
Result Show the AT command responded by cellular module in this text box. Null
Click the button to send AT command. --
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 57

4.2.5 WiFi
This section allows you to configure the parameters of WiFi AP and WiFi Clinet. Router supports either WiFi AP mode
or Client mode, and defaults as AP.
WiFi AP
Configure Router as WiFi AP

Click Interface > WiFi > WiFi, select “AP” as the mode and click “Submit”.
Note: Please remember to click Save & Apply after finish the configuration, so that the configuration can be took
effect.
Click the Access Point column to configure the parameters of WiFi AP. By default, the security mode is set as
“Disabled”.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 58

The window is displayed as below when setting “WPA-Personal” as the security mode.
The window is displayed as below when setting “WPA-Enterprise” as the security mode.
The window is displayed as below when setting “WEP” as the security mode.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 59

General Settings @ Access Point 2G

Enable Click the toggle button to enable/disable the WiFi OFF
access point option.
Wireless Mode Select from “11bgn Mixed”, “11b only”, “11g only” and 11bgn Mixed
“11n only”.
 11bgn Mixed: mix three protocols for backward
compatibility
 11b only: IEEE 802.11b, 11 Mbps~2.4GHz
 11g only: IEEE 802.11g, 54 Mbps~2.4GHz
 11n only: IEEE 802.11n, 300 Mbps
The channel that different bandwidth can choose is as
follows.
 Auto: Router will scan all frequency channels until
the best one is found
 1~13 channel of 20MHz bandwidth will be fixed to
work with this channel:
1–2412 MHz
2–2417 MHz
3–2422 MHz
4–2427 MHz
Channel 5–2432 MHz Auto
6–2437 MHz
7–2442 MHz
8–2447 MHz
9–2452 MHz
10–2457 MHz
11–2462 MHz
12–2467 MHz
13–2472 MHz
 The frequency of 3~11 channels of 40MHz
bandwidth available channel:
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 60


1–2412 MHz
2–2417 MHz
3–2422 MHz
4–2427 MHz
5–2432 MHz
6–2437 MHz
7–2442 MHz
8–2447 MHz
9–2452 MHz
10–2457 MHz
11–2462 MHz
12–2467 MHz
13–2472 MHz
SSID Enter the Service Set Identifier, the name of your router
wireless network. The SSID of a client and the SSID of
the AP must be identical for the client and AP to be able
to communicate with each other. Enter 1 to 32
characters.
Broadcast SSID Click the toggle button to enable/disable the SSID being ON
broadcast. When enabled, the client can scan your
SSID. When disabled, the client cannot scan your SSID.
If you want to connect to the router AP, you need to
manually enter the SSID of router AP at WiFi client side.
Security Mode Select from “Disabled”, “WPA-Personal”, Disabled
“WPA-Enterprise” or “WEP”.
 Disabled: User can access the WiFi without
password
Note: It is strongly recommended for security
purposes that you do not choose this kind of
mode.
 WPA-personal: WiFi access protection, only one
password is provided for identity authentication
 WPA-Enterprise: Supports 802.1x RADIUS
authentication.
 WEP: Wired Equivalent Privacy provides encryption
for wireless device’s data transmission
WPA Version Select from “Auto”, “WPA” or “WPA2”. Auto
 Auto: Router will choose automatically the most
suitable WPA version
 WPA2 is a stronger security feature than WPA
Encryption Select from “TKIP” or “AES”. AES
 TKIP: Temporal Key Integrity Protocol (TKIP)
encryption uses a wireless connection. TKIP
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 61


encryption can be used for WPA-PSK and WPA
802.1x authentication
 AES: AES encryption uses a wireless connection.
AES can be used for CCMP WPA-PSK and WPA
802.1x authentication. AES is a stronger encryption
algorithm than TKIP
Note: The security mode will affect wireless
communication rate. Different wireless modes support
different encryption modes. For example, 802.11n
supports neither WEP security mode nor TKIP
algorithm. If they are used, the wireless communication
rate will reduce to 54Mbps (802.11g mode). It is
recommended to select AES in 802.11n mode.
PSK Password Enter the Pre share key password. Enter 8 to 63 Null
characters.
Radius Authentication Serv Null
Enter the IP address of the Radius authentication server.
er Address
Radius Authentication Serv 1812
Enter the port of the Radius authentication server.
er Port
Radius Server Share Secret Enter Radius to identify the server's Shared key. Null
Group Key Update Interval Enter the time period of group key renewal. 3600
WEP Key Enter the WEP key. The key length should be 10 or 26 Null
hexadecimal digits depending on which WEP key is
used, 64 digits or 128 digits.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 62

Advanced Settings @ Access Point

Max Associated Stations Set the max number of clients allowed to access the router’s AP. (0 0
value means no limit)
Beacon Interval Set the interval of time in which the router AP broadcasts a beacon 100
which is used for wireless network authentication.
DTIM Period Set the delivery traffic indication message period and the router AP 2
will multicast the data according to this period.
RTS/CTS Threshold Set the threshold of “request to send”, which is the request to send a 2347
threshold. When the threshold set as 2347, the router AP will not
send detection signal before sending data. And when the threshold
set as 0, the router AP will send detection signal before sending data.
Fragmentation Threshold Set the fragmentation threshold of a WiFi AP. It is recommended that 2346
you use the default value 2346.
Transmit Rate Specify the data transfer rate or default to automatic. Auto
Specifiy the data transfer rate in IEEE 802.11n WiFi mode or default
11N Transmit Rate Auto
to automatic.
Transmit Power Select the transmit power level. Select from “Max”, “High”, Max
“Medium” or “Low”.
Select from "20MHz" or "40MHz".
bandwidth Note: The 40MHz channel bandwidth provides an available data 20MHZ
transfer rate that is more than twice that of a single 20MHz channel.
Enable Short GI Click the toggle button to enable/disable the Short Guard Interval ON
option. Short GI is a blank time between two symbols, providing a
long buffer time for signal delay. Using the Short GI would increase
11% in data rates, but also result in higher packet error rates.
Enable AP Isolation Click the toggle button to enable/disable the AP isolation option. OFF
When enabled, the router will isolate all connected wireless devices.
The wireless device cannot access the router directly via WLAN.
Debug Level Select from “verbose”, “deBug”, “info”, “notice”, “warning” or none
“none”.
Click to add a MAC address to the Access Control List. The maximum count for MAC address is 64.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 63

ACL Settings @ Access Point

Enable ACL Click the toggle button to enable/disable this option. OFF
ACL Mode Select ACL mode. Select from “Accept” or “Deny”. Accept
 Accept: Only the packets fitting the entities of the “Access Control
List” can be allowed
 Deny: All the packets fitting the entities of the “Access Control
List” will be denied
Note: Router can only allow or deny devices which are included in
“Access Control List” at one time.
Access Control List @ Access Point
Description Enter a description for this access control list. Null
MAC Address Add a MAC address here. Null
This section allows you to view the status of AP.
Note: WiFi is off by default. Follow the steps below to enable it and configure the router as WiFi client.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 64

WiFi Client
Configure Router as WiFi Client

Click Interface > WiFi > WiFi, select “Client” as the mode and regarding the AP type to choose the related Client Band
then click “Submit”.
And then a “WLAN” column will appear under the Interface list.
Click Interface > Link Manager > Link Settings, and click the edit button of WLAN, then configure its related
parameters.
Click Interface > WLAN to configure the parameters of WiFi Client after setting the mode as Client.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 65

Users can refresh the SSID scan results near the router. Click , and then click scan to refresh the surrounding
SSID
4.2.6 USB
This section allows you to configure the USB parameters. The router's USB interface can be used to upgrade firmware
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 66

and upgrade configuration.
General Settings @ USB

Enable USB Click the toggle button to enable/disable the USB option. ON
Enable Automatic Click the toggle button to enable/disable this option. Enable to automatically OFF
Upgrade update the firmware of the router when inserting a USB storage device with a
router firmware.
Key
USB Automatic Update Click to generate a key, and click to download the key. --
Key
Note: when using the USB automatic upgrade function, the LEDs start blinking one by one, it means that the upgrade
is in progress. When LEDs stop blinking one by one, and the USER Indicators is on, it means that the upgrade is
completed. After upgrading, the device will not restart automatically. If there is no LEDs start blinking one by one all
the time, it means there is an exception, and it does not enter into the automatic upgrade process.
4.2.7 DI/DO
This section allows you to set the DI/DO parameters. Digital Input and Digital Output are the specific interfaces for
R1520. The DI interface can be used for triggering alarm, while the DO can be used for controlling the slave device so
as to realize real-time monitoring.
DI
Click the right-most button of DI index 1 as below. The window is displayed as below when the default mode is
“ON-OFF”.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 67

The window is displayed as below when choosing “Counter” as the mode.
General Settings @ DI
Enable Click the toggle button to enable/disable the digital input function. OFF
Mode Select from “ON-OFF” or “Counter”. ON-OFF
 ON-OFF: Alarm mode can be triggered at the DI access ON-OFF.
 Counter: Event counter mode
Inversion The count is divided into a rising edge count of the level or a falling edge OFF
count. If the current rising edge count, the reverse edge is the falling edge
count.
Threshold Value The threshold value is a unique parameter when the mode is count. Set the 0
threshold value to trigger the DI alarm when the count value reaches the
threshold value.
Alarm On Content Show the content when alarm on. Alarm On
Alarm Off Content Show the content when alarm off. Alarm Off
Note: It defaults as high alarm, while turns to low alarm after enabling the “Inversion” button.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 68

DO
Click to enter the DO index 1, the configuration window is shown as below.
The window is displayed as below when choosing “Pulse” as the alarm on action.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 69

The window is displayed as below when choosing “Pulse” as the alarm off action.
General Settings @ DO
Enable Click the toggle button to enable/disable this DO. OFF
Alarm On Action Digital Output initiates when there is an alarm. Selected from “High”, “Low” or High
“Pulse”.
 High: a high electrical level output
 Low: a low electrical level output
 Pulse: Generates a square wave as specified in the pulse mode parameters when
triggered
Alarm Off Digital Output initiates when alarm removed. Selected from “High”, “Low” or “Pulse”. Low
Action  High: a high electrical level output
 Low: a low electrical level output
 Pulse: Generates a square wave as specified in the pulse mode parameters when
triggered
Initial State Specify the Digital Output status when powered on. Selected from “Last”, “High” or Last
“Low”.
 Last: DO’s status will consist with the status of last power off
 High: DO interface is in high electrical level
 Low: DO interface is in low electrical level
Delay Set the delay time for DO alarm start-up. The first pulse will be generated after a 0
(unit: 100ms) “Delay”. Enter from 0 to 3000 (0=generate pulse without delay).
Hold Time Set the hold time of DO status (Alarm On Action/Alarm Off Action). When the action 0
(unit: s) time reach this specified time, DO will stop the action. Enter from 0 to 3000 seconds.
(0=keep on until the next action)
Low-level Width Set the low-level width. It is available when enabling Pulse as “Alarm On Action/Alarm 1000
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 70

General Settings @ DO
(unit: ms) Off Action”. In Pulse Output mode, the selected digital output channel will generate a
square wave as specified in the pulse mode parameters. The low level widths are
specified here. Enter from 1000 to 3000.
High-level Set the high-level width. It is available when enabling Pulse as “Alarm On 1000
Width Action/Alarm Off Action”. In Pulse Output mode, the selected digital output channel
(unit: ms) will generate a square wave as specified in the pulse mode parameters. The high level
widths are specified here. Enter from 1000 to 3000.
Alarm Source Digital output activation can be activated by this alarm. DI1
Status
This window allows you to view the status of DI/DO interface. It can also clear the counter alarm of DI in here.
Click button to clear DI 1 or DI 2 monthly usage statistics info for counter alarm.
4.2.8 AI
This section is used to set the parameters of analog input (AI). AI is a unique interface of R1520 router. The analog
input is used to collect analog signals within a certain range, and is often used to collect continuously changing values
such as voltage, current, temperature, and pressure of the sensor. The higher the accuracy of the ADC bits used for
analog input, the finer the analog quantization and the more accurate the result.
Click the right-most button of DI index 1 as below. The window is displayed as below when the “input type” is
“voltage”.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 71

The window is displayed as below when the “input type” is “Current”.
AI (Analog Input)
Enable Click the switch button to "ON" to turn on the analog input function. OFF
Select from "Voltage" or "Current".
Input type  Voltage: The data collected is voltage Voltage
 Current: The data collected is Current
Min Set the minimum voltage threshold. When the voltage collected by the AI interface is
Threshold@Volt less than the minimum voltage threshold, an event notification will be triggered. Unit: 3
age V.
Max Set the maximum voltage threshold. When the voltage collected by the AI interface is
Threshold@Volt greater than the maximum voltage threshold, an event notification will be triggered. 20
age Unit: V.
Min Set the minimum current threshold. When the current collected by the AI interface is
Threshold@Curr less than the minimum current threshold, an event notification will be triggered. Unit: 4
ent mA.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 72

AI (Analog Input)
Max Set the maximum current threshold. When the current collected by the AI interface is
Threshold@Curr greater than the maximum current threshold, an event notification will be triggered. 16
ent Unit: mA.
Interval Collect the latest data every few seconds. 5
Click the "Status" column to view the status of the AI.
4.2.9 Serial Port
This section allows you to set the serial port parameters. The R1520 router supports two serial ports, COM1 and
COM2. It can also be modified according to requirements and configured as two COM1 or two COM2. The serial data
can be converted into IP data or through IP data into serial data, and then the data can be transmitted through wired
or wireless network, so as to realize the function of transparent data transmission.
Click the right-most button of COM1 as below.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 73

In the "Server Settings" column, when "Transparent " is selected as the application mode and "TCP Client" as the
protocol, the window is as follows:
When "Transparent " is selected as the application mode and "TCP Server" as the protocol, the window is as follows:
When "Transparent " is selected as the application mode and "UDP" is used as the protocol, the window is as follows:
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 74

When “ModBus RTU Gateway” is selected as the application mode and “TCP Client” as the protocol, the window is as
follows:
When "ModBus RTU Gateway" is selected as the application mode and "TCP Server" as the protocol, the window is
as follows:
When selecting "ModBus RTU Gateway" as the application mode and "UDP" as the protocol, the window is as
follows:
When “ModBus ASCII Gateway” is selected as the application mode and “TCP Client” as the protocol, the window is
as follows:
When selecting "ModBus ASCII Gateway" as the application mode and "TCP Server" as the protocol, the window is as
follows:
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 75

When selecting "ModBus ASCII Gateway" as the application mode and "UDP" as the protocol, the window is as
follows:
Serial Port
Serial Port Application Settings
Port Show the current serial’s name, read only. COM1
Enable Click the toggle button to enable/disable this serial port. When the status is OFF, the
OFF
serial port is not available.
Baud Rate Select from “300”, “600”, “1200”, “2400”, “4800”, “9600”, “19200”, “38400”, “57600” 115200
or “115200”.
Data Bits Select from “7” or “8”. 8
Stop Bits Select from “1” or “2”. 1
Parity Select from “None”, “Odd” or “Even”. None
Flow control Select from “None”, “Software” or “Hardware”. None
Data Packing
Packing Timeout Set the packing timeout. The serial port will queue the data in the buffer and send the 50
data to the Cellular WAN/Ethernet WAN when it reaches the Interval Timeout in the
field. The unit is milliseconds.
Note: Data will also be sent as specified by the packet length even when data is not
reaching the interval timeout in the field.
Packing Length Set the packet length. The Packet length setting refers to the maximum amount of 1200
data that is allowed to accumulate in the serial port buffer before sending. When a
packet length between 1 and 3000 bytes is specified, data in the buffer will be sent as
soon it reaches the specified length.
Server Settings
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 76


Application Mode Select from “Transparent”, “Modbus RTU Router” or “Modbus Transparent
ASCII Router”.
 Transparent: Router will transmit the serial data
transparently
 Modbus RTU Router: Router will translate the Modbus RTU
data to Modbus TCP data and sent out, and vice versa
 Modbus ASCII Router: Router will translate the Modbus ASCII
data to Modbus TCP data and sent out, and vice versa
Protocol Select from “TCP Client”, “TCP Server”, or “UDP”. TCP Client
 TCP Client: Router works as TCP client, initiate TCP
connection to TCP server. Server address supports both IP
and domain name
 TCP Server: Router works as TCP server, listening for
connection request from TCP client
 UDP: Router works as UDP client
Server Address Enter the address of server which will receive the data sent from Null
router’s serial port. IP address or domain name will be available.
Server Port Enter the specified port of server which is used for receiving the Null
serial data.
Local IP @ Transparent Enter router’s LAN IP which will forward to the internet port of Null
router.
Local Port @ Enter the port of router’s LAN IP. Null
Transparent
Local IP @ Modbus Enter the local IP of under Modbus mode. Null
Local Port @ Modbus Enter the local port of under Modbus mode. Null
Click the "Status" column to view the current serial port type.
4.3 Network
4.3.1 Route
This section allows you to set the static route. Static routes are routes based on destination addresses. Up to 20 static
routes can be added to the router. Routing Information Protocol, or RIP (Route Information Protocol), is widely used
in small networks with stable rate changes. The OSPF (Open Shortest Path First) protocol is used for decision routing
within a single autonomous system and is suitable for large networks.
Click Network> Routing> Static Route to enter the static routing table, which allows users to manually add, delete, or
modify static routing rules.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 77

Static Route
Click to add static route. The maximum count is 20.
Static Route
Description Enter a description for this route. Null
Destination Enter the IP address of destination host or destination network. Null
Netmask Enter the Netmask of destination host or destination network. Null
Router Define the router of the destination. Null
Interface Choose the corresponding port of the link that you want to configure. wwan
Status
This window allows you to view the status of route.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 78

4.3.2 Firewall
This section allows you to set the firewall and its related parameters, including Filtering, Port Mapping, Custom Rules,
DMZ and Status. Filtering rules allow users to custom accept or discard a specified access source, filtering its IP
address or MAC address.
Click "> firewall > filter" to display as follows:
Filtering
The filtering rules can be used to either accept or block certain users or ports from accessing your router.
Click to add whitelist rules. The maximum count is 50.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 79

Click to add filtering rules. The maximum count is 50. The window is displayed as below when defaulting “All” or
choosing “ICMP” as the protocol. Here take “All” as an example.
The window is displayed as below when choosing “TCP”, “UDP” or “TCP-UDP” as the protocol. Here take “TCP” as an
example.
Filtering
General Settings
Enable Filtering Click the toggle button to enable/disable the filtering option. ON
Default Filtering Policy Select from “Accept” or “Drop”. Cannot be changed when filtering Accept
rules table is not empty.
 Accept: Router will accept all the connecting requests except the
hosts which fit the drop filter list
 Drop: Router will drop all the connecting requests except the
hosts which fit the accept filter list
Access Control Settings
Enable Remote SSH Access Click the toggle button to enable/disable this option. When enabled, OFF
the Internet user can access the router remotely via SSH.
Enable Local SSH Access Click the toggle button to enable/disable this option. When enabled, ON
the LAN user can access the router locally via SSH.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 80

Filtering
Enable Remote Telnet Access Click the toggle button to enable/disable this option. When enabled, OFF
the Internet user can access the router remotely via Telnet.
Enable Local Telnet Access Click the toggle button to enable/disable this option. When enabled, ON
the LAN user can access the router locally via Telnet.
Enable Remote HTTP Access Click the toggle button to enable/disable this option. When enabled, OFF
the Internet user can access the router remotely via HTTP.
Enable Local HTTP Access Click the toggle button to enable/disable this option. When enabled, ON
the LAN user can access the router locally via HTTP.
Enable Remote HTTPS Access Click the toggle button to enable/disable this option. When enabled, ON
the Internet user can access the router remotely via HTTPS.
Enable Remote Ping Respond Click the toggle button to enable/disable this option. When enabled, ON
the router will reply to the Ping requests from other hosts on the
Internet.
Enable DOS Defending Click the toggle button to enable/disable this option. When enabled, ON
the router will defend the DOS. Dos attack is an attempt to make a
machine or network resource unavailable to its intended users.
Enable Console Click the toggle button to enable/disable this option. When enabled, ON
the user can access the router via Console.
Enable the vpn_nat traversal Click the toggle button to enable/disable this option. When enabled, OFF
the router automatically modifies the IP address of the VPN header
received by WAN/WWAN to the IP address of the device under LAN
port and sends it out.
Whitelist Rules
Description Enter a description for this whitelist rule. Null
Source Address Defines if access is allowed from one or a range of IP addresses which Null
are defined by Source IP Address, or every IP addresses.
Filtering Rules
Description Enter a description for this filtering rule. Null
Source Address Defines if access is allowed from one or a range of IP addresses which Null
are defined by Source IP Address, or every IP addresses.
Source Port Specify an access originator and enter its source port. Null
Source MAC Enter the MAC address of the defined source IP address. Null
Target Address Defines if access is allowed to one or a range of IP addresses which are Null
defined by Target IP Address, or every IP addresses.
Target Port Enter the target port which the access originator wants to access. Null
Protocol Select from “All”, “TCP”, “UDP”, “ICMP” or “TCP-UDP”. All
Note: It is recommended that you choose “All” if you don’t know
which protocol of your application to use.
Action Select from “Accept” or “Drop”. Drop
 Accept: When Default Filtering Policy is drop, router will drop all
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 81

Filtering
the connecting requests except the hosts which fit this accept
filtering list
 Drop: When Default Filtering Policy is accept, router will accept all
the connecting requests except the hosts which fit this drop
filtering list
Port Mapping
Port mapping is defined manually in the router, and the data received from some ports in the public network are all
forwarded to a port of an IP in the internal network. Click "network > firewall > port mapping" to display as follows:
Click to add port mapping rules. The maximum rule count is 50.
Port Mapping Rules

Description Enter a description for this port mapping. Null
Remote IP Specify the host or network which can access to the local IP address. Null
Empty means unlimited. e.g. 10.10.10.10/255.255.255.255 or
192.168.1.0/24
Internet Port Set the internet port of router which can be accessed by other hosts from Null
internet.
Local IP Enter router’s LAN IP which will forward to the internet port of router. Null
Local Port Enter the port of router’s LAN IP. Null
Protocol Select from “TCP”, “UDP” or “TCP-UDP” as your application required. TCP-UDP
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 82

Custom Rules
Custom rules, that is, rules that you define yourself. Click "Network> Firewall> Custom Rules" to display as follows:
Click to add custom rules. The maximum rule count is 50.
Custom firewall Rules

Description Enter a description for this custom rule. Null
Rule Specify one custom rule. Null
DMZ
The DMZ, also known as the Demilitarized Zone, is being transformed into a large swath of land. It is to solve the
problem that the access user of the external network cannot access the internal network server after installing the
firewall, and set up a buffer between the non-secure system and the secure system. A DMZ host is an Intranet host
that has open access to all ports except the occupied and forwarded ports to the specified address.
Click "> firewall > DMZ" to display the following:
DMZ Settings
Enable DMZ Click the toggle button to enable/disable DMZ. DMZ host is a host on the OFF
internal network that has all ports exposed, except those ports otherwise
forwarded.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 83

Host IP Address Enter the IP address of the DMZ host on your internal network. Null
Source IP Address Set the address which can talk to the DMZ host. 0.0.0.0 means for any Null
addresses.
Status
This window allows you to view the status of chain input, chain forward and chain output.
4.3.3 IP Passthrough
Click Network > IP Passthrough > IP Passthrough to enable or disable the IP Pass-through option.
If router enables the IP Pass-through, the terminal device (such as PC) will enable the DHCP Client mode and connect
to LAN port of the router; and after the router dial up successfully, the PC will automatically obtain the IP address and
DNS server address which assigned by ISP. To use this function, the main link needs to be set to WWAN, and the
backup link needs to be set to None.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 84

4.4 VPN
4.4.1 IPsec
This section allows you to set the IPsec and the related parameters. Internet Protocol Security (IPsec) is a protocol
suite for secure Internet Protocol (IP) communications that works by authenticating and encrypting each IP packet of
a communication session.
Click VPN > IPsec > general to set IPsec parameters.
General
General Settings @ General

Keepalive Set the time to live in seconds. The router sends keep-alive packets to the 20
NAT (Network Address Translation) server at regular intervals to prevent
the records on the NAT table from disappearing.
Click the toggle button to enable/disable this option. When enabled, when OFF
Optimize DH Size using dhgroup17 or dhgroup18, it helps to shorten the time to generate
the dh key.
Click the toggle button to enable/disable this option. Enable for IPsec VPN OFF
Debug Enable
information output to the debug port.
Tunnel
Click to add IPsec tunnel settings. The maximum count is 6.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 85

General Settings @ Tunnel

Enable Click the toggle button to enable/disable this IPsec tunnel. ON
Description Enter a description for this IPsec tunnel. Null
Router Enter the address of remote side IPsec VPN server. 0.0.0.0 represents for any Null
address.
Mode Select from “Tunnel” and “Transport”. Tunnel
 Tunnel: Commonly used between routers, or at an end-station to a router,
the router acting as a proxy for the hosts behind it
 Transport: Used between end-stations or between an end-station and a
router, if the router is being treated as a host-for example, an encrypted
Telnet session from a workstation to a router, in which the router is the
actual destination
Protocol Select the security protocols from “ESP” and “AH”. ESP
 ESP: Use the ESP protocol
 AH: Use the AH protocol
Local Subnet Enter the local subnet’s address with mask protected by IPsec, e.g. Null
192.168.1.0/24
Remote Subnet Enter the remote subnet’s address with mask protected by IPsec, e.g. 10.8.0.0/24 Null
Link binding Select the link to build Ipsec. Unbound
The window is displayed as below when choosing “PSK” as the authentication type.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 86

The window is displayed as below when choosing “CA” as the authentication type.
The window is displayed as below when choosing “PKCS#12” as the authentication type.
The window is displayed as below when choosing “xAuth PSK” as the authentication type.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 87

The window is displayed as below when choosing “xAuth CA” as the authentication type.
IKE Settings
IKE Type Select from “IKEv1” and “IKEv2”. IKEv1
Negotiation Mode Select from “Main” and “Aggressive” for the IKE negotiation mode in phase 1. Main
If the IP address of one end of an IPsec tunnel is obtained dynamically, the IKE
negotiation mode must be aggressive. In this case, SAs can be established as
long as the username and password are correct.
Authentication Select from “MD5”, “SHA1”, “SHA2 256” or “SHA2 512” to be used in IKE MD5
Algorithm negotiation.
Encrypt Algorithm Select from “3DES”, “AES128”, “AES192”and “AES256”to be used in IKE 3DES
negotiation.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 88

IKE Settings
 3DES: Use 168-bit 3DES encryption algorithm in CBC mode
 AES128: Use 128-bit AES encryption algorithm in CBC mode
IKE DH Group Select from “DHgroup1”,“DHgroup2”, “DHgroup5”, “DHgroup14”, DHgroup2
“DHgroup15”, “DHgroup16”, “DHgroup17” or “DHgroup18” to be used in key
negotiation phase 1.
Authentication Type Select from “PSK”, “CA”, “xAuth PSK” ,”PKCS#12”and “xAuth CA” to be used in PSK
IKE negotiation.
 PSK: Pre-shared Key
 CA: Certification Authority
 xAuth: Extended Authentication to AAA server
 PKCS#12: Exchange digital certificate authentication
PSK Secret Enter the pre-shared key. Null
Local ID Type Select from “Default”, “FQDN” and “User FQDN” for IKE negotiation. Default
 Default: Uses an IP address as the ID in IKE negotiation
 FQDN: Uses an FQDN type as the ID in IKE negotiation. If this option is
selected, type a name without any at sign (@) for the local security
router, e.g., test.robustel.com
 User FQDN: Uses a user FQDN type as the ID in IKE negotiation. If this
option is selected, type a name string with a sign “@” for the local
security router, e.g., test@robustel.com
Remote ID Type Select from “Default”, “FQDN” and “User FQDN” for IKE negotiation. Default
 Default: Uses an IP address as the ID in IKE negotiation
 FQDN: Uses an FQDN type as the ID in IKE negotiation. If this option is
selected, type a name without any at sign (@) for the local security
router, e.g., test.robustel.com
 User FQDN: Uses a user FQDN type as the ID in IKE negotiation. If this
option is selected, type a name string with a sign “@” for the local
security router, e.g., test@robustel.com
IKE Lifetime Set the lifetime in IKE negotiation. Before an SA expires, IKE negotiates a new 86400
SA. As soon as the new SA is set up, it takes effect immediately and the old
one will be cleared automatically when it expires.
Private Key Password Enter the private key under the “CA” and “xAuth CA” authentication types. Null
Username Enter the username used for the “xAuth PSK” and “xAuth CA” authentication Null
types.
Password Enter the password used for the “xAuth PSK” and “xAuth CA” authentication Null
types.
If click VPN > IPsec > Tunnel > General Settings, and choose ESP as protocol. The specific parameter configuration is
shown as below.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 89

When the protocol in "Virtual Private Network> IPsec> Tunnel> General Settings" selects "AH", the SA settings are
displayed as follows:
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 90

SA Settings
Encrypt Algorithm Select from “3DES”, “AES128”, “AES192”or “AES256” when you select “ESP” 3DES
in “Protocol”. Higher security means more complex implementation and
lower speed. DES is enough to meet general requirements. Use 3DES when
high confidentiality and security are required.
Authentication Select from “MD5”, “SHA1”, “SHA2 256” or “SHA2 512” to be used in SA MD5
Algorithm negotiation.
PFS Group Select from “PFS(N/A)”, “DHgroup1”,“DHgroup2”, “DHgroup5”, DHgroup2
“DHgroup14”, “DHgroup15”, “DHgroup16”, “DHgroup17” or “DHgroup18”
to be used in SA negotiation.
SA Lifetime Set the IPsec SA lifetime. When negotiating to set up IPsec SAs, IKE uses the 28800
smaller one between the lifetime set locally and the lifetime proposed by
the peer.
DPD Interval Set the interval after which DPD is triggered if no IPsec protected packets is 30
received from the peer. DPD is a Dead peer detection. DPD irregularly
detects dead IKE peers. When the local end sends an IPsec packet, DPD
checks the time the last IPsec packet was received from the peer. If the time
exceeds the DPD interval, it sends a DPD hello to the peer. If the local end
receives no DPD acknowledgment within the DPD packet retransmission
interval, it retransmits the DPD hello. If the local end still receives no DPD
acknowledgment after having made the maximum number of
retransmission attempts, it considers the peer already dead, and clears the
IKE SA and the IPsec SAs based on the IKE SA.
DPD Failures Set the timeout of DPD (Dead Peer Detection) packets. 150
Advanced Settings
Enable Compression Click the toggle button to enable/disable this option. Enable to compress OFF
the inner headers of IP packets.
Enable Forceencaps OFF
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 91

SA Settings
Expert Options Add more PPP configuration options here, format: config-desc;config-desc, Null
e.g. protostack=netkey;plutodebug=none
Status
This section allows you to view the status of the IPsec tunnel.
x509
User can upload the CA certificates for the IPsec tunnel in this section.
x509
X509 Settings
Tunnel Name Choose a valid tunnel. Select from "Tunnel 1", "Tunnel 2", "Tunnel 3", Tunnel 1
"Tunnel 4", "Tunnel 5",or "Tunnel 6".
Local Certificate Click on “Choose File” to locate the certificate file from local computer, and
--
then import this file into your router.
Remote Certificate Click on “Choose File” to locate the certificate file from remote computer,
--
and then import this file into your router.
Private Key Click on “Choose File” to locate the private key file. --
CA Certificate Click on “Choose File” to locate the correct CA certificate file. --
PKCS#12 Certificate Click on “Choose File” to locate the PKCS # 12 certificate file. --
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 92

x509
X509 Settings
Certificate Files
Filename Show the imported certificate’s name. Null
File Size Show the size of the certificate file. Null
Last Modification Show the timestamp of that the last time to modify the certificate file. Null
4.4.2 OpenVPN
This section allows you to set the OpenVPN and the related parameters. OpenVPN is an open-source software
application that implements virtual private network (VPN) techniques for creating secure point-to-point or
site-to-site connections in routed or bridged configurations and remote access facilities. Router supports
point-to-point and point-to-points connections.
Click "VPN > OpenVPN > OpenVPN" to display as follows:
OpenVPN
Click to add OpenVPN tunnel settings. The maximum count is 5. By default, the mode is “P2P”. The window is
displayed as below when choosing “P2P” as the mode.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 93

RT056_UG_R1520_v.1.0.4 Feb 27, 2023 94

The window is displayed as below when choosing “Auto” as the mode.
The window is displayed as below when choosing “Client” as the mode.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 95

The window is displayed as below when choosing “Server” as the mode.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 96

The window is displayed as below when choosing “None” as the authentication type.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 97

The window is displayed as below when choosing “Preshared” as the authentication type.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 98

The window is displayed as below when choosing “Password” as the authentication type.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 99

The window is displayed as below when choosing “X509CA” as the authentication type.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 100

The window is displayed as below when choosing “X509CA Password” as the authentication type.
General Settings @ OpenVPN

Enable Click the toggle button to enable/disable this OpenVPN tunnel. ON
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 101


Description Enter a description for this OpenVPN tunnel. Null
Mode Select from “Auto”, “P2P”, “Client” or “Server”. Client
Protocol Select from “UDP”, “TCP-Client” or “TCP-Server”. UDP
Server Address Enter the end-to-end IP address or the domain of the remote OpenVPN Null
server.
Server Port Enter the end-to-end listener port or the listener port of the OpenVPN 1194
server.
Listen IP Address Enter the IP address or domain name. Null
Listen Port Enter the listener port at this end. 1194
Interface Type Select from “TUN”, “TAP” which are two different kinds of device TUN
interface for OpenVPN. The difference between TUN and TAP device is
that a TUN device is a point-to-point virtual device on network while a
TAP device is a virtual device on Ethernet.
Username Enter the username used for “Password” or “X509CA Password” Null
authentication type.
Password Enter the password used for “Password” or “X509CA Password” Null
authentication type.
Authentication Type Select from “None”, “Preshared”, “Password”, “X509CA” and “X509CA None
Password”.
Note: “None” and “Preshared” authentication type are only working
with P2P mode.
Click the toggle button to enable / disable this option. When enabled,
Enable IP Pool OFF
the client will obtain a virtual IP from the address pool.
Local IP Enter the local virtual IP. 10.8.0.1
Remote IP Enter the remote virtual IP. 10.8.0.2
Client Subnet Client virtual IP network address. 10.8.0.0
Client Subnet 255.255.255.0
Client virtual IP network address mask.
Netmask
Encrypt Algorithm BF
Select from “BF”, “DES”, “DES-EDE3”, “AES-128”, “AES-192” and
“AES-256”.
 BF: Use 128-bit BF encryption algorithm in CBC mode
 DES: Use 64-bit DES encryption algorithm in CBC mode
 DES-EDE3: Use 192-bit 3DES encryption algorithm in CBC mode
Authentication Select from "MD5", "SHA1", "SHA256"or "SHA512". SHAI
Algorithm
Max Clients Set the retention timeout. If the connection continues to timeout during
10
this time, the OpenVPN tunnel will be re-established.
Renegotiation Set the renegotiation interval. If connection failed, OpenVPN will 86400
Interval renegotiate when the renegotiation interval reached.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 102


Keepalive Interval Set keepalive (ping) interval to check if the tunnel is active. 20
Keepalive Timeout Set the keepalive timeout. Trigger OpenVPN restart after n seconds pass 120
without reception of a ping or other packet from remote.
TUN MTU Set the MTU for the tunnel. 1500
Max Frame Size Sets the shard size of the data to be transmitted through the tunnel. Null
Private Key Password Enter the private key password under "X509CA" and "X509CA
Null
password" authentication.
Enable Compression Click the switch button to enable/disable this option. When enabled,
ON
this feature compresses the header of the IP packet.
Enable DNS overrid Click the switch button to enable/disable this option. When enabled,
OFF
DNS pushed by the server is received as the local DNS server.
Enable Bridge With L Click the toggle button to enable / disable this option. When enabled,
ON
AN0 the virtual interface can be bridged with Lan0.
Enable Default Gatew Click the toggle button to enable / disable this option. When enabled, it
OFF
ay will receive the gateway pushed by the server as the local gateway.
Enable Client Status Click the toggle button to enable / disable this option. After the server is
OFF
enabled, it can display the connected client status information.
Enable NAT Click the toggle button to enable/disable the NAT option. When OFF
enabled, the source IP address of host behind router will be disguised
before accessing the remote OpenVPN client.
Verbose Level Select the level of the output log and values from 0 to 11. 0
 0: No output except fatal errors
 1~4: Normal usage range
 5: Output R and W characters to the console for each packet read
and write
 6~11: Debug info range
Advanced Settings @ OpenVPN
Enable HMAC Click the toggle button to enable/disable this option. Add an additional OFF
Firewall layer of HMAC authentication on top of the TLS control channel to
protect against DoS attacks.
Enable PKCS#12 Click the toggle button to enable/disable the PKCS#12 certificate. It is an OFF
exchange of digital certificate encryption standard, used to describe
personal identity information.
Enable nsCertType Click the toggle button to enable/disable nsCertType. Require that peer OFF
certificate was signed with an explicit nsCertType designation of "server".
Expert Options Enter some other options of OpenVPN in this field. Each expression can Null
be separated by a ‘;’.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 103

Click user password management to add a user name and password. The maximum count is 20 as shown below.
General Settings @ Password Manage

Username In server mode, configure the client's user name. Null
Password In server mode, configure the password for the client's username. Null
Click client administration to add client information, The maximum count is 20 as shown below.
General Settings @ Client Manage

Enable Click the switch button to enable/disable this option. ON
Common Name Specify a common name for the client. Null
Client IP Address Specify the client's virtual IP address. Null
Status
This section allows you to view the status of the OpenVPN tunnel.
This section is used to locate the certificates such as CA.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 104

x509
X509 Settings
Tunnel Name Choose a valid tunnel. Select from "Tunnel 1", "Tunnel 2", "Tunnel 3", Tunnel 1
"Tunnel 4", "Tunnel 5" or"Tunnel 6".
Mode The tunnel mode set by the selected tunnel. Client
Root CA Click on “Choose File” to locate the root ca file ,and then import this file into --
your router.
Certificate File Click on “Choose File” to locate the certificate file, and then import this file --
into your router.
Private Key Click on “Choose File” to locate the private key file, and then import this file --
into your router.
TLS-Auth Key Click on “Choose File” to locate the TLS-Auth key file, and then import this --
file into your router.
PKCS#12 Certificate Click on “Choose File” to locate the PCKS#12 certificate file ,and then import --
this file into your router.
Certificate Files
Filename Show the imported certificate’s name. Null
File Size Show the size of the certificate file. Null
Last Modification Show the timestamp of that the last time to modify the certificate file. Null
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 105

4.4.3 GRE
This section allows you to set the GRE and the related parameters. Generic Routing Encapsulation (GRE) is a
tunneling protocol that can encapsulate a wide variety of network layer protocols inside virtual point-to-point links
over an Internet Protocol network. There are two main uses of GRE protocol: internal protocol encapsulation and
private address encapsulation.
GRE
Click to add tunnel settings. The maximum count is 5.
Tunnel Settings @ GRE

Enable Click the toggle button to enable/disable this GRE tunnel. GRE (Generic ON
Routing Encapsulation) is a protocol that encapsulates data packets so
that it can route packets of other protocols in an IP network.
Description Enter a description for this GRE tunnel. Null
Remote IP Address Set the remote real IP address of the GRE tunnel. Null
Local Virtual IP Address Set the local virtual IP address of the GRE tunnel. Null
Local Virtual Netmask Set the local virtual Netmask of the GRE tunnel. Null
Remote Virtual IP Address Set the remote virtual IP Address of the GRE tunnel. Null
Enable Default Route Click the toggle button to enable/disable this option. When enabled, all OFF
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 106

the traffics of the router will go through the GRE VPN.

Enable NAT Click the toggle button to enable/disable this option. This option must be OFF
enabled when router under NAT environment.
Secrets Set the key of the GRE tunnel. Null
Status
This section allows you to view the GRE tunnel status.
4.5 Services
4.5.1 Syslog
This section allows you to set the syslog parameters. The system log of the router can be saved in the local, also
supports to be sent to remote log server and specified application debugging. By default, the “Log to Remote” option
is disabled.
The window is displayed as below when enabling the “Log to Remote” option.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 107

Syslog Settings
Enable Click the toggle button to enable/disable the Syslog settings option. OFF
Syslog Level Select from “Debug”, “Info”, “Notice”, “Warning” or “Error”, which from low to Debug
high. The lower level will output more syslog in detail.
Save Position Select the save position from “RAM”, “NVM” or “Console”. Choose “RAM”, the RAM
data will be cleared after reboot.
Note: It's not recommended that saving syslog to NVM (Non-Volatile Memory)
for a long time.
Log to Remote Click the toggle button to enable/disable this option. Enable to allow router OFF
sending syslog to the remote syslog server. You need to enter the IP and Port of
the syslog server.
Add Identifier Click the toggle button to enable/disable this option. When enabled, you can add OFF
serial number to syslog message which used for loading Syslog to RobustLink.
Remote IP Address Enter the IP address of syslog server when enabling the “Log to Remote” option. Null
Remote Port Enter the port of syslog server when enabling the “Log to Remote” option. 514
4.5.2 Event
This section allows you to set the event parameters. Event feature provides an ability to send alerts by SNMP and
RCMS when certain system events occur.
General Settings @ Event

Signal Quality Threshold Set the threshold for signal quality. Router will generate a log event when 0
the actual threshold is less than the specified threshold. 0 means disable
this option.
Click button to add an Event parameters.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 108

RT056_UG_R1520_v.1.0.4 Feb 27, 2023 109

RT056_UG_R1520_v.1.0.4 Feb 27, 2023 110

General Settings @ Notification

Description Enter a description for this group. Null
Sent SMS Click the toggle button to enable/disable this option. When enabled, the router will OFF
send notification to the specified phone numbers via SMS if event occurs. Set the
related phone number in “4.5.4 Services > SMS”, and use ‘;’to separate each
number.
Phone Number Enter the phone numbers used for receiving event notification. Use a semicolon (;) Null
to separate each number.
Send Email Click the toggle button to enable/disable this option. When enabled, the router will OFF
send notification to the specified email box via Email if event occurs. Set the related
email address in “4.5.4 Services > Email”.
Email Addresses Enter the email addresses used for receiving event notification. Use a space to Null
separate each address.
DO Control Click the toggle button to enable / disable this option. After opening, DO output is OFF
triggered.
Save to NVM Click the toggle button to enable/disable this option. Enable to save event to OFF
nonvolatile memory.
In the following window you can query various types of events record. Click to query filtered events while
click to clear the event records in the window.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 111

Event Details
Save Position Select the events’ save position from “RAM” or “NVM”. RAM
 RAM: Random-access memory
 NVM: Non-Volatile Memory
Filter Message Event will be filtered according to the Filter Message that the user set. Click the Null
button, the filtered event will be displayed in the follow box. Use “&” to
separate more than one filter message, such as message1&message2.
4.5.3 NTP
This section allows you to set the related NTP (Network Time Protocol) parameters, including Time zone, NTP Client
and NTP Server.
NTP
Timezone Settings
Time Zone Click the drop down list to select the time zone you are in. EG, China: UTC UTC +08:00
+ 08:00.
Expert Setting Specify the time zone with Daylight Saving Time in TZ environment Null
variable format. The Time Zone option will be ignored in this case. Eg,
“~”.
NTP Client Settings
Enable Click the toggle button to enable/disable this option. Enable to ON
synchronize time with the NTP server.
Primary NTP Server Enter primary NTP Server’s IP address or domain name. pool.ntp.org
Secondary NTP Server Enter secondary NTP Server’s IP address or domain name. Null
NTP Update interval Enter the interval (minutes) which NTP client synchronize the time from 0
NTP server. Minutes wait for next update, and 0 means update only
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 112

once.
NTP Server Settings
Enable Click the toggle button to enable the NTP server option. Once enabled, the OFF
NTP client can synchronize with the router in time.
This window allows you to view the current time of router and also synchronize the router time. Click button
to synchronize the router time with PC’s.
4.5.4 SMS
This section allows you to set SMS parameters. Router supports SMS management, and user can control and
configure their routers by sending SMS. For more details about SMS control, refer to 5.2.2 SMS Remote Control.
SMS Management Settings

Enable Click the toggle button to enable/disable the SMS Management option. ON
Note: If this option is disabled, the SMS configuration is invalid.
Authentication Type Select Authentication Type from “Password”, “Phonenum” or “Both”. Password
 Password: Use the same username and password as WEB manager for
authentication. For example, the format of the SMS should be “username:
password; cmd1; cmd2; …”
Note: Set the WEB manager password in System > User Management
section.
 Phonenumber: Use the Phone number for authenticating, and user should
set the Phone Number that is allowed for SMS management. The format
of the SMS should be “cmd1; cmd2; …”
 Both: Use both the “Password” and “Phonenum” for authentication. User
should set the Phone Number that is allowed for SMS management. The
format of the SMS should be “username: password; cmd1; cmd2; …”
Phone Number Set the phone number used for SMS management, and use ‘; ‘to separate each Null
number.
Note: It can be null when choose “Password” as the authentication type.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 113

User can test the current SMS service whether it is available in this section.
SMS Testing
Phone Number Enter the specified phone number which can receive the SMS from router. Null
Message Enter the message that router will send it to the specified phone number. Null
Result The result of the SMS test will be displayed in the result box. Null
Click the button to send the test message. --
4.5.5 Email
Email function supports to send the event notifications to the specified recipient by ways of email.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 114

Email Settings
Enable Click the toggle button to enable/disable the Email option. OFF
Enable TLS/SSL Click the toggle button to enable/disable the TLS/SSL option. OFF
Enable STARTTLS Click the toggle button to enable/disable the STARTTLS encrypted transmission OFF
method.
Outgoing server Enter the SMTP server IP Address or domain name. Null
Server port Enter the SMTP server port. 25
Timeout Set the max time for sending email to SMTP server. When the server doesn’t 10
receive the email over this time, it will try to resend.
Auth Login Use username and password authentication OFF
Username Enter the username which has been registered from SMTP server. Null
Password Enter the password of the username above. Null
From Enter the source address of the email. Null
Subject Enter the subject of this email. Null
4.5.6 DDNS
This section allows you to set the DDNS parameters. DDNS, the full name of dynamic domain name server, is the
dynamic domain name service. DDNS service allows you to map a dynamic IP address to a fixed domain name
resolution service. Each time a user connects to the network, the client program will transmit the dynamic IP address
of the host to the server program located on the server host. The server program is responsible for providing DNS
service and realizing dynamic domain name resolution, that is, DDNS service allows you to provide dynamic w for the
host An IP assigns a fixed domain name, and other users can access your host directly through this fixed domain
name, rather than through the dynamic Wan IP address. The router's dynamic Wan IP address is assigned directly by
the ISP.
Click Service > DDNS to set the parameters related to DDNS. and its service provider defaults to DynDNS.
When service provider chose “Custom”, the window is displayed as below.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 115

DDNS Settings
Enable Click the toggle button to enable/disable the DDNS option. OFF
Service Select the DDNS service from “DynDNS”, “NO-IP”, “3322” or
Provider “Custom”.
DynDNS
Note: the DDNS service only can be used after registered by
Corresponding service provider.
Hostname Enter the hostname provided by the DDNS server. Null
Username Enter the username provided by the DDNS server. Null
Password Enter the password provided by the DDNS server. Null
URL Enter the URL customized by user. Null
Click “Status” bar to view the status of the DDNS.
DDNS Status
Item Description
Status Display the current status of the DDNS.
Last Update Time Display the date and time for the DDNS was last updated successfully.
4.5.7 SSH
Router supports SSH password access and secret-key access.
SSH Settings
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 116


Enable Click the toggle button to enable/disable this option. When enabled, you can OFF
access the router via SSH.
Port Set the port of the SSH access. 22
Disable Password Logins Click the toggle button to enable/disable this option. When enabled, you OFF
cannot use username and password to access the router via SSH. In this
case, only the key can be used for login.
Import Authorized Keys

Item Description
Authorized Keys Click on “Choose File” to locate an authorized key from your computer, and then
click “Import” to import this key into your router.
Note: This option is valid when enabling the password logins option.
4.5.8 GPS (Optional)
This section allows you to configure the GPS parameters. The GPS function of the router can locate and obtain the
location information of the device and report it to the designated server. R1520 does not have an independent GPS
module. The positioning data comes from the cellular module. Whether the GPS function is supported depends on
the cellular module.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 117

GPS
General Settings
Enable Click the toggle button to ON to enable GPS. OFF

Synchronized GPS
Click the toggle button to ON to synchronize GPS time. OFF
Time
RS232 Report Data Settings
Reporting data
Reporting GPS Information by RS232. OFF
through RS232
Reporting GGA
Reporting GGA Information. OFF
Information
Reporting VTG
Reporting VTG Information. OFF
Information
Reporting RMC
Reporting RMC Information. OFF
Information
Reporting GSV
Reporting GSV Information. OFF
Information
Click the Add button in the GPS server window, and its protocol is "TCP client" by default as shown below:
When "TCP server" is selected as the protocol, the window is displayed as follows:
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 118

When "UDP" is selected as the protocol, the window is displayed as follows:
GPS Data Forwarding Settings

Click the toggle button to "ON" to enable the GPS data forwarding
Enable ON
settings.
Select "TCP client", "TCP server" or "UDP" as the protocol.
 TCP Client: When the router acts as a TCP client, it starts up
with the TCP server (GPS server). The address of the server
Protocol supports both IP and domain name. TCP Client
 TCP server: The router acts as a TCP server (GPS server) and
listens for connection requests from TCP clients.
 UDP：Router as a UDP client.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 119

GPS Data Forwarding Settings

Server address
Set the address of the TCP server. Null
@TCP client
Server port
Set the port of the remote TCP server Null
@TCP client
Local address Set the local address of the router as a TCP server. Null
Local port Set the local port of the router as a TCP server. Null
Server address
Set the address of the TCP server Null
@UDP
Server port @UDP Set the port of the remote TCP server. Null
Send GGA
Send GGA information in NMEA format OFF
information
Send VTG
Send VTG information in NMEA format OFF
information
Send RMC
Send RMC information in NMEA format OFF
information
Send GSV
Send GSV information in NMEA format OFF
information
Advanced Settings

Click the switch button to enable/disable this option. When
Add SN as GPSID enabled, SN is appended to the NMEA message as a GPSID before OFF
transmission.
Self-define GPSID
Customize the GPSID prefix with four uppercase letters Null
Prefix
Click the "Status" column to view the current GPS status of the gateway;
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 120

GPS Status
Item Description
Status Shows the current GPS status of the router.

Shows the UTC of satellite.
UTC
Note: UTC is the world's unified time, not local time.
Final positioning
The time of the last successful positioning.
time
Number of
Number of satellites used
satellites used
Number of visible
Number of visible satellites
satellites
Latitude Shows the Latitude information of the router.
Longitude Shows the longitude information of the router.
Height Shows the height information of the router.
Speed Shows the speed information of the router.
Click the "Map" bar to view the current geographic positioning of the gateway.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 121

4.5.9 Web Server
This section allows you to modify the parameters of Web Server.
General Settings @ Web Server

HTTP Port Enter the HTTP port number you want to change in router’s Web Server. On a 80
Web server, port 80 is the port that the server "listens to" or expects to receive
from a Web client. If you configure the router with other HTTP Port number
except 80, only adding that port number then you can login router’s Web
Server.
HTTPS Port Enter the HTTPS port number you want to change in router’s Web Server. On a 443
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 122

Web server, port 443 is the port that the server "listens to" or expects to
receive from a Web client. If you configure the router with other HTTPS Port
number except 443, only adding that port number then you can login router’s
Web Server.
Note: HTTPS is more secure than HTTP. In many cases, clients may be
exchanging confidential information with a server, which needs to be secured in
order to prevent unauthorized access. For this reason, HTTP was developed by
Netscape corporation to allow authorization and secured transactions.
This section allows you to import the certificate file into the router.
Import Certificate
Import Type Select from “CA” and “Private Key”. CA
 CA: a digital certificate issued by CA center
 Private Key: a private key file
HTTPS Certificate Click on “Choose File” to locate the certificate file from your computer, and then --
click “Import” to import this file into your router.
4.5.10Advanced
This section allows you to set the Advanced and parameters. Advanced router settings include system settings and
restart.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 123

System Settings
Device Name Set the device name to distinguish different devices you have installed; valid router
characters are a-z, A-Z, 0-9, @, ., -, #, $, and *.
User LED Type Specify the display type of your USR LED. Select from “None”, “OpenVPN” or None
“IPsec”.
 None: Meaningless indication, and the LED is off
 SIM:show the sim status.
 OpenVPN: USR indicator showing the OpenVPN status
 IPsec: USR indicator showing the IPsec status
Note: For more details about USR indicator, see “2.2 LED Indicators”.
Reboot
Periodic Reboot Set the reboot period of the router. 0 means disable. 0
Daily Reboot Time Set the daily reboot time of the router, you should follow the format as HH: Null
MM, in 24h time frame, otherwise the data will be invalid. Leave it empty means
disable.
4.5.11 Smart Roaming
Smart roaming settings include common settings, health check, Ping settings and advanced settings.
General settings

Enable smart Click the toggle button to enable/disable the "Smart Roaming"
OFF
roaming function.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 124

Health check settings

The health check interval of the current connection, in
minutes. If the health check fails, Smart Roaming will try to
Health check interval switch to another carrier's network. Be careful not to set all 5 minutes
inspection conditions to values that cannot be achieved in
theory.
Click the toggle button to enable/disable the "RSSI Quality
RSSI Quality Check ON
Check" function.
RSSI threshold (3G) The signal strength threshold of the 3G network. -87 dBm
RSSI threshold (4G) The signal strength threshold of the 4G network. -87 dBm
Click the toggle button to enable/disable the "RSRP Quality
RSRP Quality Check OFF
Check" function.
The reference signal received power threshold of the 4G
RSRP threshold (4G) -105 dBm
network.
The reference signal received power threshold of the 5G
RSRP threshold (5G) -105 dBm
network.
Click the toggle button to enable/disable the "Network
Network Delay Check ON
Delay Check" function.
RTT timeout threshold Round trip timeout time 3000 ms 3000 ms
Click the toggle button to enable/disable the "Packet Loss
Packet loss rate check ON
Rate Check" function.
Packet loss rate threshold Packet loss rate threshold 70 %
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 125

PING setting

The router pings the main address/domain name to check whether
Preferred server 8.8.8.8
the current connection always exists.
The router pings the alternate address/domain name to check
Standby server 114.114.114.114
whether the current connection always exists.
Ping timeout Set the timeout period of Ping. 5 seconds
The number of ping attempts during each health check. Each ping
Ping attempts attempt will send 3 ping packets by default, so the total number of 3 times
ping packets sent during each health check is (3*ping attempts).
Advanced settings

Click the toggle button to enable/disable the "Use degraded
network" function. The definition of a degraded network is that
Use degraded network OFF
it can be connected to the Internet, but the network quality
does not meet the health check threshold.
Set the cycle of restarting the "Smart Roaming" function, in
hours. 0 means no periodic restart is enabled. Restarting
"Smart Roaming" will re-search for available carrier networks
Restart regularly 0
and reset the current status, because searching for available
carrier networks takes a long time, and restarting may take 3
to 5 minutes.
Set the time point for restarting "Smart Roaming" every day,
Restart time every day the format is HH:MM (24-hour clock). When this item is empty, null
it means shutting down and restarting.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 126

Status
Item Description
Display the current status of "Smart Roaming". Including Scanning,
Connectiing, Connected, Inactive and other statuses, respectively indicating
Status
that it is searching for available networks, connecting to the network, the
network is connected, and the function is not activated.
Shows the current method of selecting the carrier network. Including
Automatic and Manual two methods, respectively refer to the automatic
Operator selection model selection according to the standard specification and the software selection
according to the network quality, and the software will switch between
these two methods in a cycle.
The time elapsed since
Shows the elapsed time since the last search for available networks. "Smart
the last search for
Roaming" restart will refresh this time.
available networks
PLMN list
Item Description
Index PLMN list index.

PLMN = MCC + MNC, which is the combination of mobile country code and mobile
PLMN
network code.
The current network status, including Current, Visible, Forbidden, Unknown, etc.,
Status respectively indicate the current use of this network, available network, forbidden
network and unknown network.
RAT Current wireless access technologies, including 3G/4G/5G.
RSSI Current signal quality, used in 3G and 4G networks.

current reference signal received power, used in 4G and 5G networks.
RSRP (When connecting to 5G, you cannot see the signal strength RSSI, only the signal
power RSRP)
Delay The current network delay.
Packet loss rate The current network packet loss rate.

Health check The current health check status, including Pending, Good, Degraded, Failed, etc.,
status respectively indicate that the current network has not undergone a health check,
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 127

PLMN list
Item Description
the network quality is good, the network is degraded, or the network quality is
poor (including network disconnection or failure to meet the health check
threshold) .
4.6 System
4.6.1 Debug
This section allows you to check and download the syslog details. Click Service > System Log > System Log Settings to
open the system log.
Syslog
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 128

Item Description
Syslog Details
Log Level Select from “Debug”, “Info”, “Notice”, “Warn”, “Error” which from low to high. The lower
level will output more syslog in detail.
Filtering Enter the filtering message based on the keywords. Use “&” to separate more than one filter
message, such as “keyword1&keyword2”.
Refresh Select from “Manual Refresh”, “5 Seconds”, “10 Seconds”, “20 Seconds” or “30 Seconds”. You
can select these intervals to refresh the log information displayed in the follow box. If
selecting “manual refresh”, you should click the refresh button to refresh the syslog.
Click the button to clear the syslog.
Click the button to refresh the syslog.
Syslog Files
Syslog Files List Only when logging is turned on in Services > system log > system log settings can log files be
displayed in this list. The log generates a file with the size of 200K, which can display up to six
system log files. Five files named messages0 ~ messages4 are old logs, and the latest system
log file messages will be set at the top.
System Diagnosing Data
Click to generate the syslog diagnosing file.
Click to download system diagnosing file.
4.6.2 Update
This section allows you to upgrade the firmware of your router. Click System > Update > System Update, and click on
“Choose File” to locate the firmware file to be used for the upgrade. Once the latest firmware has been chosen, click
to start the upgrade process. The upgrade process may take several minutes. Do not turn off your Router
during the firmware upgrade process.
Note: To access the latest firmware file, please contact your technical support engineer.
4.6.3 App Center
This section allows you to add some required or customized applications to the router. Import and install your
applications to the App Center, and reboot the device according to the system prompts. Each installed application will
be displayed under the “Services” menu, while other applications related to VPN will be displayed under the “VPN”
menu.
Note: After importing the applications to the router, the page display may have a slight delay due to the browser
cache. It is recommended that you clear the browser cache first and log in the router again.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 129

Successfully installed apps will be displayed in the following list, click to uninstall the app.
App Center
App Install
Install to SD Click the toggle button to enable/disable the ability to install the app to the SD OFF
card card.
File Click on “Choose File” to locate the App file from your computer, and then click --
to import this file into your router.
Note: File format should be xxx.rpk.
Installed Apps
Name Show the name of the App. Null
Version Show the version of the App. Null
Status Show the status of the App. Null
Location Show the installation path. Null
Description Show the description for this App. Null
4.6.4 Tools
This section provides users three tools: Ping, Traceroute and Sniffer. The Ping tool is used to detect the network
connectivity of the router.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 130

Ping
IP address Enter the ping’s destination IP address or destination domain. Null
Number of Requests Specify the number of ping requests. 5
Timeout Specify the timeout of ping request. 1
Local IP Specify the local IP from cellular WAN, Ethernet WAN or Ethernet LAN. Null Null
stands for selecting local IP address from these three automatically.
Click this button to start ping request, and the log will be displayed in the Null
follow box.
Click this button to stop ping request. --
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 131

Traceroute
Trace Address Enter the trace’s destination IP address or destination domain. Null
Trace Hops Specify the max trace hops. Router will stop tracing if the trace hops has met 30
max value no matter the destination has been reached or not.
Trace Timeout Specify the timeout of Traceroute request. 1
Click this button to start Traceroute request, and the log will be displayed in --
the follow box.
Click this button to stop Traceroute request. --
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 132

Sniffer
Interface Choose the interface according to your Ethernet configuration. All
Host Filter the packet that contain the specify IP address. Null
Packets Request Set the packet number that the router can sniffer at a time. 1000
Protocol Select from “All”, “IP”, “TCP”, “UDP” and “ARP”. All
Port Set the port number for TCP or UDP that is used in sniffer. Null
Status Show the current status of sniffer. Null
Click this button to start the sniffer. The grab file will be displayed in the --
window. Click to download the grab file and click to delete the grab file.
Click this button to stop the sniffer. Once you click this button, a new log file --
will be displayed in the following List.
Capture Files Every times of sniffer log will be saved automatically as a new file. You can find Null
the file from this Sniffer Traffic Data List and click to download the log, click
to delete the log file. It can cache a maximum of 5 files.
4.6.5 Profile
This section allows you to import or export the configuration file, and restore the router to factory default setting.
Profile
Import Configuration File
Reset Other Settings to Click the toggle button as “ON” to return other parameters to default OFF
Default settings.
Ignore Invalid Settings Click the toggle button as “ON” to ignore invalid settings. ON
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 133

XML Configuration File Click on to locate the XML configuration file from your --
computer, and then click to import this file into your router.
Export Configuration File
Ignore Disabled Features Click the toggle button as “ON” to ignore the disabled features. OFF
Add Detailed Information Click the toggle button as “ON” to add detailed information. OFF
Encrypt Secret Data Click the toggle button as “ON” to encrypt the secret data. ON
XML Configuration File Click button to generate the XML configuration file, and --
click to export the XML configuration file.
Default Configuration
Save Running Click button to save the current running parameters as default --
Configuration as Default configuration.
Restore to Default --
Click button to restore the factory defaults.
Configuration
Rollback
Configuration Rollback
Save as a Rollbackable Create a save point manually. Additionally, the system will create a save --
Archive point every day automatically if configuration changes.
Configuration Archive Files
Configuration Archive View the related information about configuration archive files, including --
Files name, size and modification time.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 134

4.6.6 User Management
This section allows you to change your username and password, and create or manage user accounts. One router has
only one super user who has the highest authority to modify, add and manage other common users.
Note: Your new password must be more than 5 character and less than 32 characters and may contain numbers,
upper and lowercase letters, and standard symbols.
Super User Settings

New Username Enter a new username you want to create,If you do not want to change Null
username, leave it blank. 5-32 characters, valid characters: a-z, A-Z, 0-9, @, #,
$, ., *, !, -
Old Password Enter the old password of your router. The default is “admin”,5-32 characters, Null
valid characters: a-z, A-Z, 0-9, @, #, $, ., *, !, -
New Password Enter a new password you want to create, 5-32 characters, valid characters: Null
a-z, A-Z, 0-9, @, #, $, ., *, !, -
Confirm Password Enter the new password again to confirm. Null
Click button to add a new common user. The maximum rule count is 5.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 135

Common User Settings

Role Select from “Visitor” and “Editor”. Visitor
 Visitor: Users only can view the configuration of router under this level
 Editor: Users can view and set the configuration of router under this level
Username Set the Username, 5-32 characters, valid characters: a-z, A-Z, 0-9, @, #, $, ., *, !, - Null
Password Set the password, 5-32 characters, valid characters: a-z, A-Z, 0-9, @, #, $, ., *, !, - Null
4.7 Edge2cloud
4.7.1 Edge2cloud
Edge2Cloud (E2C) is a series of software collections running in the ROS operating system embedded in the Robustel
Smart Gateway device, which can provide various functions of the IoT Gateway at the hardware and software levels
and solve the problem of data interfacing between traditional industrial device and the cloud platform.
There are three types of E2C: Southbound APP, Northbound APP and Broker.
The latest ROS firmware has integrated E2C Broker, users can use the full functionality of Edeg2Cloud by choosing to
install the corresponding Southbound APP and Northbound APP according to their needs.
4.7.2 E2C Broker
This section is used to set E2C Broker parameters and view the operational status of E2C Broker. Click "Edge2Cloud >
E2C Broker" to display the following.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 136

E2C Broker Settings
Item Descriptions Default
General Settings
Enable Enable or disable E2C Broker OFF
Verbose Debug Enable Enable or disable more detailed verbose debug OFF
Whether the messages received by Broker are saved to the
Save message to database ON
database.
Database file storage area, optional: RAM, FLASH, SD-Card and
Data Storage FLASH
USB-Storage.
Database Max Size (kB) The maximum size of the database file, in KB. 1024
Whether to support sending and receiving messages through the
Remote Access Enable OFF
web interface.
E2C Broker Status
Item Descriptions
Status
Receive message
The number of MQ messages received by Broker.
count
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 137

E2C Broker Status
Item Descriptions
Send message count Debugging of MQ messages sent by Broker.

Available means that the database is available and Space exceed means that the
Database status
database capacity has reached the set maximum.
Messages
App Edge2Cloud southbound and northbound app name.
Receive The number of messages received from the application.
Send The number of messages sent to the reapplication.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 138

Chapter 5 Configuration Examples
5.1 Cellular
5.1.1 Cellular Dial-Up
This section shows you how to configure the primary and backup SIM card for Cellular Dial-up. Connect the router
correctly and insert two SIM, then open the configuration page. Under the homepage menu, click Interface > Link
Manager > Link Manager > General Settings, choose “WWAN1” as the primary link, “WWAN2” as the backup link
and “Cold Backup ”as the backup mode then click “Submit”.
Note: In the cold backup mode, when WWAN1 is the primary link, all data will be selected as WWAN1 for
transmission, and WWAN2 will always be offline as the backup link; when WWAN1 is disconnected, the data will be
switched to WWAN2 for transmission
Click the right most of edit button of WWAN1 to set its parameters according to the current ISP.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 139

When finished, click Submit > Save & Apply for the configuration to take effect.
The window is displayed below by clicking Interface > Cellular > Advanced Cellular Settings.
Click the right most of edit button of SIM1 to set its parameters according to your application request.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 140

5.1.2 SMS Remote Control
The router supports remote control via SMS. You can use following commands to get the status of the router, and set
all the parameters.
There are three authentication types for SMS control. You can select from “Password”, “Phonenum” or “Both”.
An SMS command has the following structure:

1. Password mode—Username:Password;cmd1;cmd2;cmd3;…cmdn (available for every phone number).
2. Phonenum mode-- Password;cmd1;cmd2;cmd3;… cmdn (available when the SMS was sent from the phone
number which had been added in R1520’s phone group).
3. Both mode-- Username:Password;cmd1;cmd2;cmd3;…cmdn (available when the SMS was sent from the phone
number).
Note: All command symbols must be entered in the English input half angle mode.
SMS command Explanation:

1. Password: The SMS control password defaults to the login password of the super user or the login password of
the ordinary user who has read and write permissions.
2. cmd1,cmd2,cmd3 to cmdn, the command format is the same as the CLI command, more details about CLI cmd
please refer to Chapter 6 Introductions for CLI.
Note: Download the configure XML file from the configured web browser. The format of SMS control command
can refer to the data of the XML file.
Go to System > Profile > Export Configuration File, Select export type as "complete", click to
generate the XML file and click to export the XML file.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 141

XML command:
<lan>
<network max_entry_num="2">
<id>1</id>
<interface>lan0</interface>
<ip>172.16.24.24</ip>
<netmask>255.255.0.0</netmask>
<mtu>1500</mtu>
SMS cmd:
set lan network 1 interface lan0
set lan network 1 ip 172.16.24.24
set lan network 1 netmask 255.255.0.0
set lan network 1 mtu 1500
3. The semicolon character (‘;’) is used to separate more than one command packed in a single SMS.
4. E.g.
Password mode—admin:admin;status system
In this command, username is “admin”, password is “admin”, The control command is status system, and the
function of the command is to get the system status.
SMS received:
hardware_version = 1.1
firmware_version = 3.1.0
firmware_version_full = "3.1.0 (Rev 3199)"
kernel_version = 4.9.152
device_model = R1520
serial_number = ""
uptime = "0 days, 00:02:55"
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 142

system_time = "Thu May 14 05:51:56 2020 (NTP not updated)"

ram_usage = "75M Free/128M Total"
admin:admin;reboot
In this command, username is “admin”, password is “admin”, and the command is to reBoot the R1520 Router.
SMS received:
OK
admin:admin;set firewall remote_ssh_access false;set firewall remote_telnet_access false

In this command, username is “admin”, password is “admin”, and the command is to disaBle the
remote_ssh and remote_telnet access.
SMS received:
OK
OK
admin:admin; set lan network 1 interface lan0;set lan network 1 ip 172.16.24.24;set lan network 1 netmask
255.255.0.0;set lan network 1 mtu 1500
In this command, username is “admin”, password is “admin”, and the commands is to configure
the LAN parameter.
SMS received:
OK
OK
OK
OK
5.2 VPN Configuration Example
5.2.1 IPsec VPN
IPSec VPN sample topology (configuration of Ike and SA parameters of server and client must be consistent):
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 143

IPsec VPN_Server:
Cisco 2811:
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 144

IPsec VPN_Client:
The window is displayed as below by clicking VPN > IPsec > Tunnel.
Click button and set the parameters of IPsec Client as below.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 145

The comparison between IPec Server and Client is as below.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 146

5.2.2 OpenVPN
OpenVPN supports two modes, including Client and P2P. Here takes P2P as an example.
The configuration of two points is as follows.
OpenVPN_Server:
Generate relevant OpenVPN certificate on the server side firstly, and refer to the following commands to
configuration the Server:
local 202.96.1.100
mode server
port 1194
proto udp
dev tun
tun-mtu 1500
fragment 1500
ca ca.crt
cert Server01.crt
key Server01.key
dh dh1024.pem
server 10.8.0.0 255.255.255.0
ifconfig-pool-persist ipp.txt
push "route 192.168.3.0 255.255.255.0"
client-config-dir ccd
route 192.168.1.0 255.255.255.0
keepalive 10 120
cipher BF-CBC
comp-lzo
max-clients 100
persist-key
persist-tun
status openvpn-status.log
verB 3
Note: For more configuration details, please contact your technical support engineer.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 147

OpenVPN_Client:
Click VPN > OpenVPN > OpenVPN as below.
Click to configure the Client01 as below.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 148

5.2.3 GRE VPN
GRE VPN example topology:
The configuration of two points is as follows.
GRE-1：
The window is displayed as below by clicking VPN > GRE > GRE.
Click button and set the parameters of GRE-1 as below.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 149

GRE-2:
Click button and set the parameters of GRE-2 as below.
The comparison between GRE-1 and GRE-2 is as below.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 150

Chapter 6 Introductions for CLI
6.1 What Is CLI
The Command Line Interface (CLI) is a set of software interfaces that provide another way to configure device
parameters. Users can connect to the router through SSH or telnet to configure CLI commands. After establishing a
Telnet or SSH connection with the router, enter the login account and password (default admin/admin) to enter the
router's configuration mode, as shown below.
Router login:
Router login: admin
Password: admin
#
CLI commands:
# ? (Note: the ‘?’ won’t display on the page.)
! Comments
add Add a list entry of configuration
clear Clear statistics
config Configuration operation
debug Output debug information to the console
del Delete a list entry of configuration
exit Exit from the CLI
help Display an overview of the CLI syntax
ovpn_cert_get Download OpenVPN certificate file via http or ftp
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 151

ping Send messages to network hosts

reboot Halt and perform a cold restart
set Set system configuration
show Show system configuration
status Show running system information
tftpupdate Update firmware or configuration file using tftp
traceroute Print the route packets trace to network host
trigger Trigger action
urlupdate Update firmware via http or ftp
ver Show version of firmware
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 152

6.2 How to Configure the CLI
Following is a table about the description of help and the error should be encountered in the configuring program.
Commands /tips Description
? Typing a question mark “?” will show you the help information.
Example:
# config（Tick ‘?’）
config Configuration operation
# config（Tick the space key+’?’）

commit Save the configuration changes and take effect
changed configuration
save_and_apply Save the configuration changes and take effect
changed configuration
loaddefault Restore Factory Configuration
Ctrl+c Tick these two keys at the same time, except its “copy” function but also
can be used for “break” out of the setting program.
Syntax error: The command is not Command is not completed.
completed
Tick space key+ Tab key It can help you finish your currently incomplete commands.
Example:
# config (tick Enter key)
Syntax error: The command is not completed
# config (tick space key+ Tab key)

commit save_and_apply loaddefault
# config save_and_apply / When your setting finished, you should enter those commands to make
#config commit your setting take effect on the device.
Note: Commit and save_and_apply plays the same role.
6.3 Commands Reference
Commands Syntax Description

Debug Debug parameters enable on or disenable the debug function
Show Show parameters Show current configuration of each function
Set Set parameters All the function parameters are set by commands set and add, the
Add Add parameters difference is that set is for the single parameter and add is for the list
parameter
Note: More detail about CLI command, please refer to “Command Line Interface Guide”.
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 153

6.4 Quick Start with Configuration ExampleS
The best and quickest way to master CLI is firstly to view all features from the webpage and then read all CLI
commands at a time, finally learn to configure it with some reference examples.
Example 1: Show current version

# status system
hardware_version = 1.1
firmware_version =3.1.0
firmware_version_full = "3.1.0 (Rev 3199)"
kernel_version = 4.9.152
device_model = R1520
serial_number = ""
uptime = "0 days, 00:06:51"
system_time = "Thu May 14 05:55:52 2020 (NTP not updated)"
ram_usage = "74M Free/128M Total"
Example 2: Update firmware via tftp

# tftpupdate （space+?）
firmware New firmware
# tftpupdate firmware （space+?）
String Firmware name
# tftpupdate firmware r1520-firmware-3.1.0.ruf host 192.168.100.99 // enter a new firmware name
Downloading
r1520-firmware-s 100% |*******************************| 5018k 0：00：00 ETA
Flashing
Checking 100%
Decrypting 100%
Flashing 100%
Verifying 100%
Verfify Success
upgrade success // update success
# config save_and_apply
OK // make you configuration effect after reboot
Example 3: Set link-manager

# set
# set (space+?)
ai AI
cellular Cellular
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 154

ddns DDNS
dido DIDO
email Email
ethernet Ethernet
event Event Management
firewall Firewall
gps GPS
gre GRE
ip_passthrough IP Passthrough
ipsec IPSec
lan Local Area Network
link_manager Link Manager
ntp NTP
openvpn OpenVPN
reboot Automatic Reboot
route Route
serial_port Serial Port
sms SMS
ssh SSH
syslog Syslog
system System
usb USB
user_management User Management
web_server Web Server
wifi WiFi AP
# set link_management
primary_link Primary Link
Backup_link Backup Link
Backup_mode BackSup Mode
emergency_reBoot Emergency ReBoot
link Link Settings
# set link_management primary_link（space+?）
Enum Primary Link （wwan1/wwan2/wan/wlan）
# set link_management primary_link wwan1 //select “wwan1” as primary link
OK //setting succeed
set link_manager link 1
type Type
desc Description
connection_type Connection Type
wwan WWAN Settings
static_addr Static Address Settings
pppoe PPPoE Settings
ping Ping Settings
mtu MTU
dns1_overrided Overrided Primary DNS
dns2_overrided Overrided Secondary DNS
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 155

# set link_manager link 1 type wwan1

OK
# set link_manager link 1 wwan
auto_apn Automatic APN Selection
apn APN
username Username
password Password
dialup_numBer Dialup NumBer
auth_type Authentication Type
aggressive_reset Aggressive Reset
switch_By_data_allowance Switch SIM By Data Allowance
data_allowance Data Allowance
Billing_day Billing Day
# set link_manager link 1 wwan switch_By_data_allowance true
OK
#
# set link_manager link 1 wwan data_allowance 100 //open cellular switch_by_data_traffic
# set link_manager link 1 wwan Billing_day 1 //setting specifies the day of month for billing
…
OK //save and apply current configuration, make you configuration effect
Example 4: Set Ethernet

# set Ethernet port_setting 2 port_assignment lan0 //Set Table 2 (eth1) to lan0
OK
# config save_and_apply //make you configuration effect
OK
Example 5: Set LAN IP address

# show lan all
network {
id = 1
interface = lan0
ip = 192.168.0.1
netmask = 255.255.255.0
mtu = 1500
dhcp {
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 156

umber = true
mode = server
relay_server = “”
pool_start = 192.168.0.2
pool_end = 192.168.0.100
netmask = 255.255.255.0
gateway = “”
primary_dns = “”
secondary_dns = “”
wins_server = “”
lease_time = 120
expert_options = “”
umbe_enaBle = false
}
}
multi_ip {
id = 1
interface = lan0
ip = 172.16.24.24
netmask = 255.255.0.0
}
#
# set lan
network Network Settings
multi_ip Multiple IP Address Settings
vlan VLAN
# set lan network 1(space+?)
interface Interface
ip IP Address
netmask Netmask
mtu MTU
dhcp DHCP Settings
# set lan network 1 interface lan0
OK
# set lan network 1 ip 172.16.24.24 //set IP address for lan
# set lan network 1 netmask 255.255.0.0
OK
#
…
OK //save and apply current configuration, make you configuration
effect
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 157

Example 6: CLI for setting Cellular

# show cellular all
sim {
id = 1
card = sim1
phone_numBer = “”
extra_at_cmd = “”
network_type = auto
Band_select_type = all
Band_gsm_850 = false
Band_wcdma_850 = false
Band_lte_800 = false
Band_tdd_lte_2600 = false
}
sim {
id = 2
card = sim2
phone_numBer = “”
extra_at_cmd = “”
network_type = auto
Band_select_type = all
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 158

}
# set(space+?)
ai AI
cellular Cellular
ddns DDNS
dido DIDO
email Email
ethernet Ethernet
event Event Management
firewall Firewall
gps GPS
gre GRE
ip_passthrough IP Passthrough
ipsec IPSec
lan Local Area Network
link_manager Link Manager
ntp NTP
openvpn OpenVPN
reboot Automatic Reboot
route Route
serial_port Serial Port
sms SMS
ssh SSH
syslog Syslog
system System
usb USB
user_management User Management
web_server Web Server
wifi WiFi AP
# set cellular(space+?)
sim SIM Settings
# set cellular sim(space+?)
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 159

Integer Index (1..2)
# set cellular sim 1(space+?)

card SIM Card
phone_number Phone Number
pin_code PIN Code
extra_at_cmd Extra AT Cmd
telnet_port Telnet Port
network_type Network Type
band_select_type Band Select Type
band_settings Band Settings
telit_band_settings Band Settings
debug_enable Debug Enable
verbose_debug_enable Verbose Debug Enable# set cellular sim 1 phone_numBer 18620435279
OK
…
OK // save and apply current configuration, make you configuration eff
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 160

Glossary
Abbr. Description
AC Alternating Current
AI Analog Input
APN Access Point Name of GPRS Service Provider Network
ASCII American Standard Code for Information Interchange
CE Conformité Européene (European Conformity)
CHAP Challenge Handshake Authentication Protocol
CLI Command Line Interface for Batch scripting
CSD Circuit Switched Data
CTS Clear to Send
dB Decibel
dBi Decibel Relative to an Isotropic radiator
DC Direct Current
DCD Data Carrier Detect
DCE Data Communication Equipment (typically modems)
DCS 1800 Digital Cellular System, also referred to as PCN
DI Digital Input
DO Digital Output
DSR Data Set Ready
DTE Data Terminal Equipment
DTMF Dual Tone Multi-frequency
DTR Data Terminal Ready
EDGE Enhanced Data rates for Global Evolution of GSM and IS-136
EMC Electromagnetic Compatibility
EMI Electro-Magnetic Interference
ESD Electrostatic Discharges
ETSI European Telecommunications Standards Institute
FDD LTE Frequency Division Duplexing Long Term Evolution
GND Ground
GPRS General Packet Radio Service
GRE generic route encapsulation
GSM Global System for Mobile Communications
HSPA High Speed Packet Access
ID identification data
IMEI International Mobile Equipment Identification
IP Internet Protocol
IPsec Internet Protocol Security
kBps kbits per second
L2TP Layer 2 Tunneling Protocol
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 161

Abbr. Description
LAN local area network
LED Light Emitting Diode
M2M Machine to Machine
MAX Maximum
Min Minimum
MO Mobile Originated
MS Mobile Station
MT Mobile Terminated
OpenVPN Open Virtual Private Network
PAP Password Authentication Protocol
PC Personal Computer
PCN Personal Communications Network, also referred to as DCS 1800
PCS Personal Communication System, also referred to as GSM 1900
PDU Protocol Data Unit
PIN Personal Identity Number
PLCs Program Logic Control System
PPP Point-to-point Protocol
PPTP Point to Point Tunneling Protocol
PSU Power Supply Unit
PUK Personal Unblocking Key
R&TTE Radio and Telecommunication Terminal Equipment
RF Radio Frequency
RTS Request to Send
RTU Remote Terminal Unit
Rx Receive Direction
SDK Software Development Kit
SIM subscriber identification module
SMA antenna Rubber antenna or Magnet antenna
SMS Short Message Service
SNMP Simple Network Management Protocol
TCP/IP Transmission Control Protocol / Internet Protocol
TE Terminal Equipment, also referred to as DTE
Tx Transmit Direction
UART Universal Asynchronous Receiver-transmitter
UMTS Universal Mobile Telecommunications System
USB Universal Serial Bus
USSD Unstructured Supplementary Service Data
VDC Volts Direct Current
VLAN Virtual Local Area Network
VPN Virtual Private Network
VSWR Voltage Stationary Wave Ratio
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 162

Abbr. Description
WAN Wide Area Network
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 163

鲁邦通 R1520 用户手册
Guangzhou Robustel Co., Ltd.

Address: 501, Building #2,63 Yongan Road, Huangpu District,
Guangzhou, China 510660
Tel: 86-20-82321505
Email: info@robustel.com
RT056_UG_R1520_v.1.0.4 Feb 27, 2023 164

RT056 Ug R1520 V.1.0.4

Uploaded by

Copyright:

Available Formats

RT056 Ug R1520 V.1.0.4

Uploaded by

Document Information

Original Title

Copyright

Available Formats

Share this document

Share or Embed Document

Sharing Options

Did you find this document useful?

Is this content inappropriate?

Copyright:

Available Formats

RT056 Ug R1520 V.1.0.4

Uploaded by

Copyright:

Available Formats

Robustel R1520 User Guide

RT056_UG_R1520_v.1.0.4 Feb 27, 2023 1

Guangzhou Robustel Co., Ltd.

About This Document

Copyright©2022 Guangzhou Robustel Co., Ltd.

Trademarks and Permissions

RT056_UG_R1520_v.1.0.4 Feb 27, 2023 2

Using the Router in Vehicle

RT056_UG_R1520_v.1.0.4 Feb 27, 2023 3

Protecting Your Router

RT056_UG_R1520_v.1.0.4 Feb 27, 2023 4

Regulatory and Type Approval Information

Table 2: Standards of the electronic industry of the People’s Republic of China

RT056_UG_R1520_v.1.0.4 Feb 27, 2023 5

Table 3: Toxic or Hazardous Substances or Elements with Defined Concentration Limits

RT056_UG_R1520_v.1.0.4 Feb 27, 2023 6

Operating Frequency and Maximum Transmit Power for EU

Model: R1520-4L (V): B056703

RT056_UG_R1520_v.1.0.4 Feb 27, 2023 7

LTE FDD B7 2500~2570MHz, 2620~2690MHz 23dBm±2dB

Wi-Fi frequency bands

RT056_UG_R1520_v.1.0.4 Feb 27, 2023 8

Date Firmware Version Document Version Change Description

RT056_UG_R1520_v.1.0.4 Feb 27, 2023 9

RT056_UG_R1520_v.1.0.4 Feb 27, 2023 10

4.4 VPN .................................................................................................................................................................... 85

RT056_UG_R1520_v.1.0.4 Feb 27, 2023 11

Chapter 1 Product Overview

ensure stable wireless network connections.

1.2 Package Contents

 1 x 2*4-pin 3.5 mm male terminal block for serial port

RT056_UG_R1520_v.1.0.4 Feb 27, 2023 12

 1 x 2*3-pin 3.5 mm male terminal block for DI/DO/AI interface

 1 x SMA-J cellular antenna (rubber antenna)

 1 x RP-SMA-J WiFi antenna (rubber antenna)

 1 x SIM Card Sticker

 Optional Accessories (sold separately)

 SMA-J cellular antenna (rubber antenna or Magnet antenna is optional）

RT056_UG_R1520_v.1.0.4 Feb 27, 2023 13

 RP-SMA-J WiFi antenna (rubber antenna or Magnet antenna is optional）

 SMA-J GPS antenna (Magnetic or adhesive is optional)

 35 mm DIN Rail mounting kit

 AC/DC power adapter (12V DC，1.5 A；EU/US/UK/AU plug optional)

RT056_UG_R1520_v.1.0.4 Feb 27, 2023 14

GPS Interface (Optional, depending on the cellular module)

RT056_UG_R1520_v.1.0.4 Feb 27, 2023 15

 Measuring range: 4 ~ 20mA / 0 ~ 24V

Power Supply and Consumption

RT056_UG_R1520_v.1.0.4 Feb 27, 2023 16

Chapter 2 Hardware Installation

2.1 Definition of Power Interface

PIN Description Note

2.2 Interface Definition of 2 * 3 3.5mm

RT056_UG_R1520_v.1.0.4 Feb 27, 2023 17

1 IN -- Digital input positive

2 -- OUT -- Digital output positive

4 IGND -- -- Digital input negative

5 -- OGND -- Digital output negative

Analog input signal