Logix5000 Controllers ASCII Strings: Programming Manual

Programming Manual
Logix5000 Controllers ASCII Strings

1756 ControlLogix, 1756 GuardLogix, 1769 CompactLogix, 1769 Compact GuardLogix, 1789
SoftLogix, 5069 CompactLogix, Studio 5000 Logix Emulate
Important user information
Read this document and the documents listed in the additional resources section about installation, configuration, and operation of
this equipment before you install, configure, operate, or maintain this product. Users are required to familiarize themselves with
installation and wiring instructions in addition to requirements of all applicable codes, laws, and standards.
Activities including installation, adjustments, putting into service, use, assembly, disassembly, and maintenance are required to be
carried out by suitably trained personnel in accordance with applicable code of practice. If this equipment is used in a manner not
specified by the manufacturer, the protection provided by the equipment may be impaired.
In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages resulting from the use or
application of this equipment.
The examples and diagrams in this manual are included solely for illustrative purposes. Because of the many variables and
requirements associated with any particular installation, Rockwell Automation, Inc. cannot assume responsibility or liability for
actual use based on the examples and diagrams.
No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits, equipment, or software
described in this manual.
Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell Automation, Inc., is
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WARNING: Identifies information about practices or circumstances that can cause an explosion in a hazardous environment, which may lead to
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Summary of changes
This manual contains new and updated information. Changes to this manual are
documented in the following table.
Change Topic
Updated the list of supported controllers. Cover
Rockwell Automation Publication 1756-PM013E-EN-P - June 2016 3

Table of contents
Preface Studio 5000 environment ..................................................................................... 7

Additional resources............................................................................................... 7
Chapter 1
Communicating with an ASCII Introduction ............................................................................................................ 9

device Connect the ASCII device .................................................................................. 10
Configure the Serial Port .................................................................................... 10
Configure the User Protocol .............................................................................. 12
Create string data types ....................................................................................... 13
Read characters from the device ......................................................................... 14
Send characters to the device .............................................................................. 15
Enter ASCII characters ....................................................................................... 17
Chapter 2
Processing ASCII characters Introduction .......................................................................................................... 19

Extract a part of a Bar Code ................................................................................ 19
Look up a Bar Code.............................................................................................. 20
Create the PRODUCT_INFO Data Type.............................................. 21
Search for the characters............................................................................... 21
Identify the Lane Number ........................................................................... 22
Reject bad characters ..................................................................................... 22
Enter the Product IDs and Lane Numbers ............................................... 23
Check the Bar Code characters .......................................................................... 23
Convert a value ..................................................................................................... 24
Decode an ASCII message .................................................................................. 25
Build a string .......................................................................................................... 26
Appendix A
ASCII character codes ASCII charter codes ............................................................................................. 29

Index

Preface
This manual shows how to manipulate ASCII strings in Logix5000 controllers.

This manual is one of a set of related manuals that show common procedures for
programming and operating Logix5000 controllers.
For a complete list of common procedures manuals, refer to the Logix5000

Controllers Common Procedures Programming Manual publication
1756-PM001.
The term Logix5000 controller refers to any controller that is based on the
Logix5000 operating system.
Studio 5000 environment The Studio 5000 Automation Engineering & Design Environment™ combines
engineering and design elements into a common environment. The first element is
the Studio 5000 Logix Designer™ application. The Logix Designer application is
the rebranding of RSLogix™ 5000 software and will continue to be the product to
program Logix5000™ controllers for discrete, process, batch, motion, safety, and
drive-based solutions.
The Studio 5000® environment is the foundation for the future of

Rockwell Automation® engineering design tools and capabilities. The Studio 5000
environment is the one place for design engineers to develop all elements of their
control system.
These documents contain additional information concerning related Rockwell

Additional resources
Automation products.
Resource Description
Industrial Automation Wiring and Grounding Guidelines , Provides general guidelines for installing a Rockwell
publication 1770-4.1 Automation industrial system.

Preface
Resource Description
Product Certifications webpage, available at Provides declarations of conformity, certificates, and other
http://ab.rockwellautomation.com certification details.
You can view or download publications at

http://www.rockwellautomation.com/literature. To order paper copies of
technical documentation, contact your local Rockwell Automation distributor or
sales representative.
8 Rockwell Automation Publication 1756-PM013E-EN-P - June 2016

Chapter 1
Communicating with an ASCII device
You can exchange ASCII data with a device through the serial port of the
Introduction
controller. For example, you can use the serial port to:
• Read ASCII characters from a weigh scale module or bar code reader.
• Send and receive messages from an ASCII triggered device, such as a
MessageView terminal.
Firmware revision 3.1 and later of the 1756-EWEB EtherNet/IP Web Server
module supports the controller serial port and a socket interface that lets
Logix5000 controllers exchange ASCII data using TCP or UDP socket services.

Chapter 1 Communicating with an ASCII device
Connect the ASCII device To connect to the ASCII device, use these steps.
1. On the serial port of the ASCII device, determine which pins send signals
and which pins receive signals.
2. Connect sending pins to corresponding receiving pins and attach jumpers.
If the communications Then wire the connectors

Handshake
Do not handshake
3. Attach the cable shield to the connectors.
4. Connect the cable to the controller and the ASCII device.
Configure the Serial Port To configure the serial port, use these steps.
1. On the Online toolbar, in the controller project, click the controller

button.
2. On the Controller Properties dialog box, click the Serial Port tab.

Communicating with an ASCII device Chapter 1
3. On the Mode menu, choose User and type the configuration settings for
the serial port.
• Choose the baud rate, data bits, parity, and stop bits.
• In the Control Line menu, choose the Control Line option:
If And And this is the Choose Then
You are not using a modem ---------------------------------------------------------------> No Handshaking
You are using a modem Modems in a point-to-point link -----------------------------> Full Duplex
are full-duplex
Master modem is full-duplex master controller. Full Duplex
while slave modem is half-duplex
slave controller Half Duplex Select the Continuous Carrier check box.
All modems in the system are -----------------------------> Half Duplex Clear the Continuous Carrier check box
half-duplex (default).
• In the RTS Send Delay box, type the delay (in 20 ms units) between
the time the RTS signal turns on (high) and the time that data is sent.
For example, a value of 4 produces an 80 ms delay.
• In the RTS Off Delay box, type the delay (in 20 ms units) between the
time the last character is sent and the time that the RTS signal turns off
(low).
4. Click Apply.

Configure the User Protocol To configure the user protocol, use these steps.
1. In the Controller Properties dialog box, click the User Protocol tab.
• Enter a buffer size greater than or equal to the greatest number of

characters in a transmission. Twice the number of characters is a good
guideline.
• For ABL or ARL instructions, enter termination characters to mark the
end of the data. For ASCII codes, see ASCII Character Codes on page
29.
If the device sends Then Tips

One termination character • In the Termination Character 1 box, type the For printable characters, such as 1 or A, type the character.
hexadecimal ASCII code for the first character.
• In the Termination Character 2 box, type $FF.
Two termination characters In the Termination Character 1 and 2 boxes, type the
hexadecimal ASCII code for each character.
• For AWA instruction, enter append characters. For ASCII codes, see
ASCII Character Codes on page 29.
To append Then Tips

One character • In the Append Character 1 box, type the For printable characters, such as 1 or A, type the character.
hexadecimal ASCII code for the first character.
• In the Append Character 2 box, type $FF.
Two characters In the Append Character 1 and 2 boxes, type the
hexadecimal ASCII code for each character.

• If the ASCII device is configured for XON/XOFF flow control, select

the XON/XOFF check box.
• If the ASCII device is a CRT or pre-configured for half duplex
transmission, select the Echo Mode check box.
• Choose the Delete Mode using the following considerations:
If the ASCII device is Select Tips

CRT CRT • The DEL character ($7F) and the character that precedes the DEL character are not sent to
the destination.
• If echo mode is selected and an ASCII instruction reads the DEL character, the echo returns
three characters: BACKSPACE SPACE BACKSPACE ( $08 $20 $08).
Printer Printer • The DEL character ($7F) and the character that precedes the DEL character are not sent to
the destination.
• If echo mode is selected and an ASCII instruction reads the DEL character, the echo returns
two characters: / ($2F) followed by the character that was deleted.
None of the above Ignore The DEL character ($7F) is treated as any other character.
2. Click OK.
Store ASCII characters in tags that use a string data type.

Create string data types
You can use the default STRING data or You can create a string data type to store the
type. It stores up to 82 characters. number of characters that you define.
Important: Use caution when you create a string data type. If you decide later to change the size of the
string data type, you may lose data in any tags that currently use that data type.
If you Then
Make a string data type smaller • The data truncates.
• The LEN does not change.
Make a string data type larger The data and LEN resets to zero.

1. In the Controller Organizer, right-click Strings and choose New String

Type.
2. In the Name box, type the name for the data type.
3. In the Maximum Characters box, type the maximum number of characters

that the string data type stores.
4. Click OK.
Read characters from the As a general rule, before you read the buffer, use an ACB or ABL instruction to
verify that the buffer contains the required characters.
device
• An ARD or ARL instruction continues to read the buffer until the
instruction reads the required characters.
• While an ARD or ARL instruction reads the buffer, no other ASCII Serial
Port instructions, except the ACL, can execute.
• Verifying that the buffer contains the required characters prevents the ARD
or ARL from holding up the execution of other ASCII Serial Port
instructions while the input device sends its data.
For additional information on ASCII Serial Port instructions, see Logix5000

Controllers General Instruction Set Reference Manual.
In the following example, the device sends a fixed number of characters, such as a
bar code reader:
Example: A bar code reader sends bar codes to the serial port (channel 0) of the controller. Each bar code contains 24 characters. To determine
when the controller receives a bar code, the ACB instruction continuously counts the characters in the buffer.
When the buffer contains at least 24 characters, the controller received a bar code. The ARD instruction moves the bar code to the
bag_bar_code tag.

In the following example, the device sends a variable number of characters, such as
a message or display terminal.
Example: Continuously test the buffer for a message.

• Because each message ends in a carriage return ($0D), the carriage return is configured as the termination character in the
Controller Properties dialog box, User Protocol tab.
• When the ABL finds a carriage return, its sets the FD bit.
When the ABL instruction finds the carriage return (MV_line.FD is set), the controller removes the characters from the buffer, up to and
including the carriage return, and places them in the MV_msg tag.
Send characters to the When you send characters to the device, you must determine either to send the
same number of characters each time or to append terminations characters to the
device data.
In the following example, you always send the same number of characters and
want to automatically append one or two characters to the end of the data.
Example: When the temperature exceeds the high limit (temp_high is on), the AWA instruction sends five
characters from the string[1] tag to a MessageView terminal.
• The $14 counts as one character. The hex code for the Ctrl-T character.
• The instruction also sends (appends) the characters defined in the user protocol. In this example,
the AWA instruction sends a carriage return ($0D), which marks the end of the message.
And then to always send the same number of characters:

Example: When the temperature reaches the low limit (temp_low is on), the AWT instruction sends nine
characters from the string[2] tag to a MessageView terminal. (The $14 counts as one character. The
hex code for the Ctrl-T character.)
In the following example, you send a different number of characters each time and
want to automatically append one or two characters to the end of the data:
Example: When alarm is on, the AWA instruction sends the characters in alarm_msg and appends a
termination character.
• Because the number of characters in alarm_msg varies, the rung first moves the length of
alarm_msg (alarm_msg.LEN) to the length of the AWA instruction (alarm_write.LEN).
• In alarm_msg, the $14 counts as one character. The hex code for the Ctrl-T character.
Send a different number of characters each time:
Example: When MV_update is on, the AWT instruction sends the characters in MV_msg.
• Because the number of characters in MV_msg varies, the rung first moves the length of MV_msg
(MV_msg.LEN) to the length of the AWT instruction (MV_write.LEN).
• In MV_msg, the $16 counts as one character. The hex code for the Ctrl-V character.

Enter ASCII characters To enter the ASCII characters, use these steps.
Important: This String Browser window shows the characters up to the value of the LEN member of the string
tag. The string tag may contain additional data, which the String Browser window does not show.
1. In the AWA instruction, double-click the value area of Source.
Dollar sign ($24) Carriage return ($0D)
Single quote ($27) Tab ($09)
Line feed ($0A) The number of characters that you see in the
window. The same as the LEN member of the
string tag.
New line ($0D$0A) The maximum number of characters that the
string tag can hold.
Form feed ($0C)
2. In the text box, type the characters for the string.
3. Click OK.

Chapter 2
Processing ASCII characters
You can process ASCII characters to do many things, including:

Introduction
• Interpret a bar code and take action based on the bar code.
• Use a weight from a weigh scale when the weight is sent as ASCII
characters.
• Decode a message from an ASCII triggered device, such as an operator
terminal.
• Build a string for an ASCII triggered device using variables from your
application.
Extract a part of a Bar Code For example, a bar code may contain information about a bag on a conveyor at an
airport. To check the flight number and destination of the bag, you extract
characters 10 - 18.
Airline Origin Flight # Destination Date
Bar code N W A H O P 5 0 5 8 A M S 0 2 2 2 0 1
Character number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
5 0 5 8 A M S
9 characters
Example: In the baggage handling conveyor of an airport, each bag gets a bar code. Characters 10 - 18 of the
bar code are the flight number and destination airport of the bag. After the bar code is read
(bag_read.EM is on) the MID instruction copies the flight number and destination airport to the
bag_flt_and_dest tag.

Chapter 2 Processing ASCII characters
Look up a Bar Code For example, in a sorting operation, an array of a user-defined data type creates a
table that shows the lane number for each type of product. To determine which
lane to route a product, the controller searches the table for the product ID
(characters of the bar code that identify the product).
To look up a bar code, follow these procedures:
• Create the PRODUCT_INFO Data Type on page 21.

• Search for the characters on page 21.
• Identify the Lane Number on page 22.
• Reject Bad Characters on page 22.
• Enter the Product IDs and Lane Numbers on page 23.
Tip: To copy the above components from a sample project, open the Samples folder. On the Help menu, click
Vendor Sample Projects.

Processing ASCII characters Chapter 2
Create the PRODUCT_INFO Data Type

To create a Product_Info user-defined date type in the Controller Organizer,
right-click User-Defined and click New Data Type. Configure the user-defined
data type as follows.
Data Type: PRODUCT_INFO

Name PRODUCT_INFO
Description Identifies the destination for an item based on an ASCII string of characters that identify the
item
Members
Name Data Type Style Description
Product_ID STRING ASCII characters that identify the item
Lane DINT Decimal Destination for the item, based on its ID
Search for the characters

You can search for characters by creating the following ladder logic routine.
The SIZE instruction performs the following:
• Counts the number of elements in the sort_table array (type

PRODUCT_INFO). This array contains the product ID for each item and
the corresponding lane number for the item.
• Counts the number of elements in Dimension 0 of the array. In this case,
the only dimension.
• Sets the Length of the subsequent FSC instruction equal to the size of the
sort_table array.
The FSC instruction searches each Product_ID member in the sort_table array
until the instruction finds a match to the product_id tag.

• The sort_table_search tag controls the FSC instruction.

• Although the previous instruction sets the Length of this instruction, you
enter an initial value to verify the project.
• The product_id tag contains the bar code characters that you want to find.
Identify the Lane Number

Add the following rung to the routine to identify the LANE member.
When the FSC instruction finds the product ID within the sort_table array, the
instruction sets the FD bit. The POS member indicates the element number
within the sort_table array of the match. The corresponding LANE member
indicates the lane number of the match.
Based on the POS value, the MOV instruction moves the corresponding lane
number into the lane tag. The controller uses the value of this tag to route the
item.
After the MOV instruction sets the value of the lane tag, the RES instruction
resets the FSC instruction so it can search for the next product ID.
Reject bad characters
If the FSC instruction does not find the product ID within the sort_table array,
the instruction sets the DN bit. The MOV instruction moves 999 into the lane tag
to notify the controller to reject or reroute the item.
After the MOV instruction sets the value of the lane tag, the RES instruction
resets the FSC instruction so it can search for the next product ID.

Enter the Product IDs and Lane Numbers

In the sort_table array, enter the ASCII characters to identify each item and the
corresponding lane number for the item.
Use a compare instruction (EQU, GEQ, GRT, LEQ, LES, NEQ) to check for
Check the Bar Code
characters.
characters
• The hexadecimal values of the characters determine if one string is less than
or greater than another string.
• When the two strings are sorted, as in a telephone directory, the order of the
strings determines which one is greater.
Use one of the following compare instruction.
To see if the string is: Enter this instruction:

Equal to specific characters EQU
Not equal to specific characters NEQ
Greater than specific characters GRT
Equal to or greater than specific characters GEQ
Less than specific characters LES
Equal to or less than specific characters LEQ

Example: When bag_flt_and_dest is equal to gate[1], xfer[1] turns on. This routes the bag to the required gate.
You can convert the ASCII representation of a value to an DINT or REAL value
Convert a value that you can use in your application.
• The STOD and STOR instructions skip any initial control or non-numeric
characters (except the minus sign in front of a number).
• If the string contains multiple groups of numbers that are separated by

delimiters (for example, / ), the STOD and STOR instructions convert only
the first group of numbers.
The following rung converts ASCII characters to a floating-point value:
Example: After reading the weight from the scale (weight_read.EM is on), the STOR instruction converts the
numeric characters in weight_ascii to a REAL value and stores the result in weight.
The following rung converts ASCII characters to an integer value:
Example: When MV_read.EM is on, the STOD instruction converts the first set of numeric characters in MV_msg to
an integer value. The instruction skips the initial control character ($06) and stops at the delimiter ( \ ).

Decode an ASCII message You can extract and convert a value from an ASCII message that contains
multiple values. A message may look like the following example:
Rung A: Find and Convert a

Floating-Point Value
The FIND instruction locates characters within a string.
• The Source contains the string tag to search.

• The Result contains the location where the FIND instruction locates the
search value you specify.
The MID instruction identifies a group of characters within a string and places
them in their own string tag.

• The source is the same string tag as for the FIND instruction.
• The quantity values tells the MID instruction how many characters to pull
from the source.
• The start value is the same as the Result value from the FIND instruction.
This tells the MID instruction where to start pulling characters from the
Source.
• The Destination contains the characters you located.
Build a string The following example builds a string that contains two variables. For example, an
operator terminal may require a string that looks like the following:
• For more variables, use additional INSERT or CONCAT instructions.

• If you must send a floating-point value, use a RTOS instruction in place of
the DTOS instruction.
• The final string excludes the termination character. When you send the
string, use an AWA instruction to automatically append the termination
character.
Example: To trigger a message in a MessageView terminal, the controller sends the terminal a message in this
format: [Ctrl-T] message # \ address [CR]
Important: When send_msg is on, the rung does the following:
− The first DTOS instruction converts the message number to ASCII characters.
− The INSERT instruction inserts the message number (in ASCII) after the control character
[Ctrl-T]. (The hex code for Ctrl-T is $14.)
− The second DTOS instruction converts the node number of the terminal to ASCII characters.
− The CONCAT instruction puts the node number (in ASCII) after the backslash [ \ ] and stores
the final string in msg.
Important: To send the message, an AWA instruction sends the msg tag and appends the carriage return
[CR].


Appendix A
ASCII character codes
ASCII charter codes

Character Dec Hex Character Dec Hex Character Dec Hex Character Dec Hex
[ctrl-@] NUL 0 $0 SPACE 32 $20 @ 64 $40 ‘ 96 $60
[ctrl-A] SOH 1 $1 ! 33 $21 A 65 $41 a 97 $61
[ctrl-B] STX 2 $2 “ 34 $22 B 66 $42 b 98 $62
[ctrl-C] ETX 3 $3 # 35 $23 C 67 $43 c 99 $63
[ctrl-D] EOT 4 $4 $ 36 $24 D 68 $44 d 100 $64
[ctrl-E] ENQ 5 $5 % 37 $25 E 69 $45 e 101 $65
[ctrl-F] ACK 6 $6 & 38 $26 F 70 $46 f 102 $66
[ctrl-G] BEL 7 $7 ‘ 39 $27 G 71 $47 g 103 $67
[ctrl-H] BS 8 $8 ( 40 $28 H 72 $48 h 104 $68
[ctrl-I] HT 9 $9 ) 41 $29 I 73 $49 i 105 $69
[ctrl-J] LF 10 $l ($0A) * 42 $2A J 74 $4A j 106 $6A
[ctrl-K] VT 11 $0B + 43 $2B K 75 $4B k 107 $6B
[ctrl-L] FF 12 $0C , 44 $2C L 76 $4C l 108 $6C
[ctrl-M] CR 13 $r ($0D) - 45 $2D M 77 $4D m 109 $6D
[ctrl-N] SO 14 $0E . 46 $2E N 78 $4E n 110 $6E
[ctrl-O] SI 15 $0F / 47 $2F O 79 $4F o 111 $6F
[ctrl-P] DLE 16 $10 0 48 $30 P 80 $50 p 112 $70
[ctrl-Q] DC1 17 $11 1 49 $31 Q 81 $51 q 113 $71
[ctrl-R] DC2 18 $12 2 50 $32 R 82 $52 r 114 $72
[ctrl-S] DC3 19 $13 3 51 $33 S 83 $53 s 115 $73
[ctrl-T] DC4 20 $14 4 52 $34 T 84 $54 t 116 $74
[ctrl-U] NAK 21 $15 5 53 $35 U 85 $55 u 117 $75
[ctrl-V] SYN 22 $16 6 54 $36 V 86 $56 v 118 $76
[ctrl-W] ETB 23 $17 7 55 $37 W 87 $57 w 119 $77
[ctrl-X] CAN 24 $18 8 56 $38 X 88 $58 x 120 $78
[ctrl-Y] EM 25 $19 9 57 $39 Y 89 $59 y 121 $79
[ctrl-Z] SUB 26 $1A : 58 $3A Z 90 $5A z 122 $7A
ctrl-[ ESC 27 $1B ; 59 $3B [ 91 $5B { 123 $7B
[ctrl-\] FS 28 $1C < 60 $3C \ 92 $5C | 124 $7C
ctrl-] GS 29 $1D = 61 $3D ] 93 $5D } 125 $7D
[ctrl-^] RS 30 $1E > 62 $3E ^ 94 $5E ~ 126 $7E
[ctrl-_] US 31 $1F ? 63 $3F _ 95 $5F DEL 127 $7F

Index
A
S
ASCII
configure serial port 12 send
configure user protocol 13 ASCII characters 17
enter characters 19 serial
manipulate characters 21 configure port for ASCII 12
organize data 15 string
read characters 16 data type 15
write characters 17 enter characters 19
manipulate 21
organize data 15
C read characters 16
configure write characters 17
serial port for ASCII 12 string data type
user protocol for ASCII 13 create 15
create
string data type 15
T
tag
D string 15
data
ASCII 15
U
enter ASCII characters 19
user protocol
configure for ASCII 13
E
enter
W
ASCII characters 19
write
ASCII characters 17
M
manipulate string 21
O
organize
strings 15
R
read
ASCII characters 16

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Rockwell Automation provides technical information on the web to assist you in using its products. At
http://www.rockwellautomation.com/support you can find technical and application notes, sample code, and links to software
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and forums, technical information, FAQs, and to sign up for product notification updates.
In addition, we offer multiple support programs for installation, configuration, and troubleshooting. For more information, contact
your local distributor or Rockwell Automation representative, or visit http://www.rockwellautomation.com/services/online-phone.
Installation assistance
If you experience a problem within the first 24 hours of installation, review the information that is contained in this manual. You can
contact Customer Support for initial help in getting your product up and running.
United States or Canada 1.440.646.3434

Outside United States or Canada Use the Worldwide Locator available at http://www.rockwellautomation.com/locations, or contact your local Rockwell
Automation representative.
New product satisfaction return

Rockwell Automation tests all of its products to ensure that they are fully operational when shipped from the manufacturing facility.
However, if your product is not functioning and needs to be returned, follow these procedures.
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your distributor to complete the return process.
Outside United States Please contact your local Rockwell Automation representative for the return procedure.
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complete the feedback form, publication RA-DU002.
Rockwell Automation Publication 1756-PM013E-EN-P - June 2016
Supersedes Publication 1756-PM013D-EN-P - October 2014 Copyright © 2016 Rockwell Automation, Inc. All rights reserved. Printed in the U.S.A.

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Rockwell Automation Publication 1756-PM013E-EN-P - June 2016 3

Preface Studio 5000 environment ..................................................................................... 7

Communicating with an ASCII Introduction ............................................................................................................ 9

Processing ASCII characters Introduction .......................................................................................................... 19

ASCII character codes ASCII charter codes ............................................................................................. 29

Rockwell Automation Publication 1756-PM013E-EN-P - June 2016 5

This manual shows how to manipulate ASCII strings in Logix5000 controllers.

For a complete list of common procedures manuals, refer to the Logix5000

The Studio 5000® environment is the foundation for the future of

These documents contain additional information concerning related Rockwell

Rockwell Automation Publication 1756-PM013E-EN-P - June 2016 7

You can view or download publications at

8 Rockwell Automation Publication 1756-PM013E-EN-P - June 2016

Communicating with an ASCII device

Rockwell Automation Publication 1756-PM013E-EN-P - June 2016 9

2. Connect sending pins to corresponding receiving pins and attach jumpers.

If the communications Then wire the connectors

3. Attach the cable shield to the connectors.

4. Connect the cable to the controller and the ASCII device.

1. On the Online toolbar, in the controller project, click the controller

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• Enter a buffer size greater than or equal to the greatest number of

If the device sends Then Tips

To append Then Tips

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• If the ASCII device is configured for XON/XOFF flow control, select

If the ASCII device is Select Tips

Store ASCII characters in tags that use a string data type.

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1. In the Controller Organizer, right-click Strings and choose New String

3. In the Maximum Characters box, type the maximum number of characters

For additional information on ASCII Serial Port instructions, see Logix5000

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Example: Continuously test the buffer for a message.

And then to always send the same number of characters:

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Send a different number of characters each time:

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1. In the AWA instruction, double-click the value area of Source.

Dollar sign ($24) Carriage return ($0D)

Single quote ($27) Tab ($09)

2. In the text box, type the characters for the string.

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Processing ASCII characters

You can process ASCII characters to do many things, including:

Airline Origin Flight # Destination Date

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To look up a bar code, follow these procedures:

• Create the PRODUCT_INFO Data Type on page 21.

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Create the PRODUCT_INFO Data Type

Data Type: PRODUCT_INFO

Lane DINT Decimal Destination for the item, based on its ID

Search for the characters

The SIZE instruction performs the following: