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Specification and Implementation Guide for MODBUS over ...

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MODBUS over serial line Specification and Implementation Guide 1/44 12/02/02 MODBUS over serial Line Specification & Implementation Guide MODBUS over serial line Specification and Implementation Guide 2/44 12/02/02 Contents 1 Introduction.

The MODBUS Serial Line protocol is a Master-Slaves protocol. Only one master (at the same time) is connected to the bus, and one or several (247 maximum number) slaves nodes are also connected to the same serial bus. A MODBUS communication is always initiated by the master.

  Serial, Communication

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