Multi-node selection communication method based on equipment types in Modbus RTU network

A device type and communication method technology, applied in the Modbus field, can solve the problems that the address extension technology is not compatible with the serial Modbus standard, the Modbus standard does not support broadcast and multicast, and the screening of target nodes in the group, so as to improve the efficiency of message transmission, The effect of a long history and easy configuration

Active Publication Date: 2020-05-26
DATA TELLIT SUZHOU INC
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Problems solved by technology

[0005] 1. The standard Modbus standard does not support broadcast and multicast functions. If the master node wants to send the same command to multiple slave nodes, it must be sent one by one.
[0006] 2. Although part of the address extension technology can realize the multicast function, it still cannot realize the screening of the target nodes in the group (only all can be selected), and the address extension technology is not compatible with the serial Modbus standard (equivalent to formulating another standard ), not compatible with

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  • Multi-node selection communication method based on equipment types in Modbus RTU network
  • Multi-node selection communication method based on equipment types in Modbus RTU network
  • Multi-node selection communication method based on equipment types in Modbus RTU network

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention, but the cited embodiments are not intended to limit the present invention.

[0028] The invention discloses a multi-node selection communication method based on equipment types in a Modbus RTU network, which can select one, part or all of the same type of equipment in a Modbus instruction for operation. For example, 5 rows of lights turn off 1 row, 3 rows, or all of them. This method is different from multicast. The multicast message is effective for all nodes in the group, and some of them cannot be selected. This method has high operating efficiency, high flexibility, high reliability, and is compatible with Modbus RTU specifications.

[0029] The invention discloses a multi-node selection communication method based on equipment types in a Modbus RTU network...

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Abstract

The invention discloses a multi-node selection communication method based on equipment types in a Modbus RTU network. One, part or all of devices of the same type can be selected from one Modbus instruction for operation. For example, one row, three rows or all of the five rows of light are turned off. The method is different from multicast. Multicast messages are effective to all nodes in a group, and part of the nodes cannot be selected. The method is high in operation efficiency, high in flexibility, high in reliability and compatible with Modbus RTU specifications.

Description

Technical field [0001] The present invention relates to the field of Modbus, in particular to a multi-node selection communication method based on device types in a Modbus RTU network. Background technique [0002] The Modbus communication protocol is widely used in the field of automation control. Specifically, it is divided into three communication modes: Modbus ASCII, Modbus RTU and Modbus TCP. Among them, Modbus RTU is the most common in practical applications. The Modbus RTU protocol is a master-slave (master / slave) architecture serial protocol: in a ModBus network, there is a master node (master) with address 0 and multiple slave nodes (slave), and each slave device has There is a unique address, the address value is between 1 and 247. [0003] Traditional technology has the following technical problems: [0004] The Modbus RTU specification does not allow duplicate node addresses, and the standard protocol does not have broadcast and multicast functions (the communication pr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/40
CPCH04L12/40202H04L2012/40228
Inventor 孙宝石
Owner DATA TELLIT SUZHOU INC
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