Description
A-B 1407-CGCM Communication System
A-B 1407-CGCM’s Mobdus communication protocol is widely used in industrial control, the protocol structure is simple and general, most of the industrial control systems support this protocol.The ModbuS standard defines the application layer messaging protocol on layer 7 of the 051 model, it also standardizes protocols on the serial link to allow for querying and answering between a single master node and multiple slave nodes.
The Modbus serial link protocol for A-B 1407-CGCM is a master/slave protocol that is located at layer 2 of the 051 model. The MOdbus application protocol, located at Layer 7 of the 051, defines simple Protocol Data Units (PDUs) independent of the communication layer below it, and the Modbus protocol mapping for RS one 485 bus networks constructs Modbus PDUs at the master node that initiates the ModbuS transaction processing, and then adds additional domains to construct the Modbus Serial Link communication PDUs.
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