KR101726343B1 - Multi-band serial communication device and data communication method using it - Google Patents

Abstract

The present invention relates to a multi-band serial communication device, and more specifically, to a multi-band serial communication device capable of reducing a network delay time by allowing a communication node on a network to access a plurality of token loops to acquire more chances to receive a token from the token loops, and to a data communication method using the same. To this end, the multi-band serial communication device comprises: a first packet communication unit connected to a first token loop to transmit/receive a first token packet or a data packet; a second packet communication unit connected to a second token loop to transmit/receive a second token packet or a data packet; a memory storing data; a data processing unit dividing the data stored in the memory into predetermined sizes to create data packets or integrating the data packets to create data; and a communication processing unit sharing a transmission buffer with the first and second packet communication units, and transmitting the data packet stored in the shared transmission buffer through the first or second packet communication unit when the first or second token packet is received.

Description

[0001] The present invention relates to a multi-band serial communication device and a data communication method using the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-band serial communication apparatus, and more particularly, to a multi-band serial communication apparatus capable of reducing network latency by acquiring more opportunities for a communication node on a network to connect to a plurality of token loops, And a data communication method using the same.

In a building automation system (BAS), one master node polls the remaining master nodes, so that as the number of nodes increases, the network delay time increases. This delay time increases the overall response time of the system Delay.

When the number of nodes is increased and the network delay time is increased, conventionally, a method of reducing the number of nodes per network by dividing the network is used in order to reduce the network delay time.

However, the conventional method is disadvantageous in that additional wiring, routers, and other equipment are required for network segmentation.

Furthermore, in a case where controllers of a long distance are connected in series by a single communication line, such as a system employing a variable air volume system (VAV), it is often difficult to divide the network even if the network delay time increases.

Korean Patent No. 10-1314992

It is an object of the present invention to provide a communication method capable of preventing a network delay time from increasing even when the number of nodes on a network increases.

Another object of the present invention is to provide a communication method capable of reducing a network delay time without dividing a network.

To this end, a multi-band serial communication apparatus according to the present invention includes a first packet communication unit connected to a first token loop to transmit and receive a first token packet or a data packet, a second packet communication unit connected to a second token loop, A memory for storing data; a data processor for dividing data stored in the memory into a predetermined size to generate a data packet or to integrate data packets, and a second packet communication unit And transmitting the data packet stored in the shared transmission buffer through the first packet communication unit when the first token packet or the second token packet is received by sharing the transmission buffer with respect to the second packet communication unit, And a communication processing unit for transmitting the data.

Also, a multi-band serial communication system according to the present invention includes a main master node sharing a transmission buffer and a reception buffer and having at least two or more packet communication units, at least two packet communication units sharing a transmission buffer and a reception buffer, Wherein at least two token loops are formed through the packet communication unit between the main master node and the plurality of sub master nodes, including a plurality of sub master nodes.

In addition, a method for multi-band serial communication according to the present invention is a method for performing data communication between communication nodes by mutually connecting a plurality of communication nodes through a token loop, the method comprising the steps of: If the token packet is a token packet, the communication node determines whether the token packet was received through a first token loop or a second token loop; and if the token packet is received via the first token loop, Transmitting a data packet stored in a transmission buffer shared for a token loop and a second token loop through the one token loop; and if the token packet is received via the second token loop, And transmitting a data packet stored in a transmission buffer shared for a second token loop through the two token loop It should.

As described above, according to the present invention, a communication node on a network is connected to at least two or more token loops to obtain more opportunities to receive tokens from the token loops, thereby transmitting and receiving more data packets. The network response time can be shortened by reducing the network delay time.

1 is a configuration diagram of a multi-band serial communication system according to the present invention;
Fig. 2 is an internal configuration diagram of a multi-band serial communication device according to the present invention; Fig.
3 is a flowchart of a multi-band serial communication method according to the present invention;

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The configuration of the present invention and the operation and effect thereof will be clearly understood through the following detailed description.

Before describing the present invention in detail, the same components are denoted by the same reference symbols as possible even if they are displayed on different drawings. In the case where it is judged that the gist of the present invention may be blurred to a known configuration, do.

First, some terms will be described to help understand the present invention.

BACnet (Building Automation & Control Network) is a non-proprietary standard protocol accepted by organizations composed of building managers, system users and manufacturers. It is mainly used in Building Automation Systems (BAS) to communicate with power-consuming devices in buildings.

Master Slave Token Passing (MSTP) is a protocol developed by BACnet for RS-485 and is used in building automation. MSTP adopts token passing method.

The token passing scheme refers to a link license management procedure of a local area network (LAN) using a ring communication path.

According to the token passing scheme, a plurality of nodes or stations are connected to a ring-like one-way communication path, and the transmission right is sequentially transferred from the node to the node as tokens. When a node receives a token, there is data to send, and when there is no data to send and there is no data to send, the token is passed to another node when it is sent. The data has a receiving node address, which is monitored by each node. A node between the sending node and the receiving node relays the data to the next node if it is not a self address. The receiving node detects that the address is its own address and receives the data.

1 shows a configuration of a multi-band serial communication system according to the present invention.

1, the multi-band serial communication system includes MSTP protocol communication nodes 100, 100-1, 100-2, ..., 100-N and is applied to building automation (BAS) Send and receive data to and from the BACnet application layer 200.

In the embodiment of the present invention, it is assumed that the multi-band serial communication system is applied to building automation. However, the present invention can be applied to other control fields. At this time, the communication nodes transmit and receive data to and from the application layer of another control field.

In the MSTP protocol, a master node can receive a token packet and a data packet, and a slave node receives only a data packet. The MSTP protocol is generally composed of a master node.

Therefore, in the embodiment of the present invention, all the communication modes are configured as master nodes, and the master node includes a master master node 100 directly connected to the BACnet application layer 200 and a sub master node 100 connected to a peripheral device (not shown) 100-1, 100-2, ..., 100-N.

The master nodes 100, 100-1, 100-2, ..., 100-N are interconnected via a token loop, with each master node connected to two token loops. That is, each master node is interconnected through the first token loop 1 and also through the second token loop 2.

In the embodiment of the present invention, the master nodes are connected to two token loops at the same time, but the present invention is not limited thereto and may be connected to three or more token loops at the same time depending on the network.

When the master node receives the token packet through the token loop (1, 2), it can transmit a maximum specified number of data packets. If there is no data packet to be transmitted or if all data packets are transmitted, the token packet is transmitted to the next master node having a larger address than itself.

Data related to automatic building control are generated in the BACnet application layer 200 and transferred from the master master node 100 to the other sub master nodes 100-1, 100-2, ..., 100-N .

The master nodes 100-1 to 100-N operate the peripheral devices using the data received from the master node 100 and transmit the data acquired from the peripheral devices to the master node 100 do.

Thus, since the master nodes are connected to at least two token loops, each master node can receive token packets through at least two token loops, thereby increasing the chance of receiving token packets.

As the chance of receiving the token packet increases, the data transmission opportunity also increases, so that the transmission frequency of the data of the BACnet application layer 200 and the data of the peripheral device increases, and the overall communication response time of the building automation system becomes faster.

2 shows an internal configuration of a master node according to the present invention.

The master node shown in FIG. 2 is common to the master master node and the sub master node, but will be described mainly with reference to the master master node 100. FIG.

The main master node 100 includes a data processing unit 10, a memory 20, a communication processing unit 30, a first packet communication unit 40, a second packet communication unit 50, and the like.

The data processing unit 10 transfers the data of the BACnet application layer 200 to the communication processing unit 30 and receives the data from the communication processing unit 30 and sends the data to the application layer 200.

The data processing unit 10 divides the data of the application layer 200 into data of a predetermined size and transmits the data to the communication processing unit 30. The data processing unit 30 integrates data (packets) received from the communication processing unit 30, ).

The memory 20 stores data of the application layer 200 or data of a peripheral device. The data generated in the application layer 200 is temporarily stored in the memory 20 and the data processor 10 reads the data of the application layer 200 stored in the memory 20 and divides the data into packets. In addition, data generated in a peripheral device connected to the secondary master node is received in a packet form, and the data processing unit 10 integrates the packets and stores them in the memory 20.

The communication processing unit 30 includes a transmission buffer 32 and a reception buffer 34. [

The transmission buffer 32 is a part for temporarily storing (buffering) data packets input from the data processing unit 10 and the reception buffer 34 is a part for temporarily storing data packets received from another master node.

The communication processing unit 30 allows the transmission buffer 32 and the reception buffer 34 to be shared with the first packet communication unit 40 and the second packet communication unit 50. [

That is, when the token packet (first token packet) is received through the first packet communication unit 40 or the token packet (second token packet) is received through the second packet communication unit 50, And transmits the data packet stored in the transmission buffer 32 through the first packet communication unit 40 or the second packet communication unit 50.

In other words, when the token packet arrives in either the first token loop or the second token loop, the communication processing unit 30 transmits the data packet stored in the transmission buffer 32 to the corresponding token loop and transmits it.

When the data packet is received through the first packet communication unit 40 or the second packet communication unit 50, the communication processing unit 30 stores the data packet in the shared reception buffer 34.

In other words, the communication processing unit 30 stores the data packet in the shared reception buffer 34 if the data packet is received in either the first token loop or the second token loop, if it is the reception address.

The first packet communication unit 40 is connected to the first token loop 1 and receives a token packet or a data packet from the first token loop 1 or a token packet or data packet through the first token loop 1 .

The second packet communication unit 50 is connected to the second token loop 2 and receives a token packet or data packet from the second token loop 2 or a token packet or data packet through the second token loop 2 .

In the embodiment of the present invention, the first packet communication unit 40 and the second packet communication unit 50 may be RS-485 communication modules.

3 shows a flowchart of a multi-band serial communication method according to the present invention.

Referring to FIG. 3, the master node first receives a packet through a token loop (S10).

If the received packet is a token packet (S12), the master node checks whether a data packet is present in the current transmission buffer (S20).

If there is no data packet in the transmission buffer, the master node forwards the received token packet to the next master node (S22), and waits for reception of the next packet.

However, if there is a data packet in the transmit buffer, the master node determines whether the received token packet has been received through the first token loop or the second token loop (S24).

When the token packet is received through the first token loop, the master node transmits the data packet stored in the transmission buffer through the first packet communication unit (S26).

On the other hand, if the token packet is received through the second token loop, the master node transmits the data packet stored in the transmission buffer through the second packet communication unit (S28).

After transmitting the data packet through the first packet communication unit or the second packet communication unit, the master node returns to step S20 to check whether there is a data packet yet to be transmitted in the transmission buffer, and repeats the process of step S20 and subsequent steps.

Returning to step S12, if the received packet is not a token packet, the master node determines whether the received packet is a data packet (S14).

If the received packet is a data packet, the master node stores the data packet in the receiving buffer (S18), and returns to step S10 to receive the next packet.

However, if the received packet is not a data packet, the master node performs the network management operation step S16, and returns to step S10 to receive the next packet.

The foregoing description is merely illustrative of the present invention, and various modifications may be made by those skilled in the art without departing from the spirit of the present invention.

Accordingly, the embodiments disclosed in the specification of the present invention are not intended to limit the present invention. The scope of the present invention should be construed according to the following claims, and all the techniques within the scope of equivalents should be construed as being included in the scope of the present invention.

1: first token loop 2: second token loop
10: data processor 20: memory
30: communication processing unit 32: transmission buffer
34: Receive buffer 40: First packet communication section
50: second packet communication unit 100: master node
200: Application layer

Claims (7)

A first packet communication unit connected to the first token loop for transmitting and receiving a first token packet or a data packet,
A second packet communication unit connected to the second token loop for transmitting and receiving a second token packet or a data packet,
A memory for storing data,
A data processor for dividing data stored in the memory into a predetermined size to generate a data packet or integrate data packets to generate data;
When the first token packet or the second token packet is received by sharing the transmission buffer with respect to the first packet communication unit and the second packet communication unit, a data packet stored in the shared transmission buffer is transmitted through the first packet communication unit, 2 packet communication unit. The multi-band serial communication apparatus includes: The method according to claim 1,
Wherein the communication processing unit shares the reception buffer with respect to the first packet communication unit and the second packet communication unit and stores the data packet received through the first packet communication unit or received through the second packet communication unit in the shared reception buffer Band serial communication device. delete delete delete A method for communicating data between communication nodes by interconnecting a plurality of communication nodes through a token loop,
The communication node receiving a packet;
If the received packet is a token packet, the communication node verifies whether the token packet was received via a first token loop or a second token loop;
Transmitting a data packet stored in a transmission buffer shared by the communication node to the first token loop and the second token loop through the first token loop when the token packet is received through the first token loop;
And if the token packet is received via the second token loop, the communication node transmits the data packet stored in a transmission buffer shared for the first token loop and the second token loop through the second token loop A method of data communication between communication nodes. The method according to claim 6,
Further comprising storing the data packet in a receive buffer shared by the communication node for the first token loop and the second token loop if the received packet is a data packet.

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