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
CN111200547AActive Publication Date: 2020-05-26DATA TELLIT SUZHOU INC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DATA TELLIT SUZHOU INC
Publication Date
2020-05-26

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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.
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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...

Claims

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