Multiple Modbus TCP or Modbus RTU Masters and Slaves

Any combination of network designs described in chapters 1–5 is possible. The only limitation is that a Master with Modbus RTU cannot communicate with a Slave using Modbus TCP.

A Slave with Modbus RTU protocol may simultaneously communicate with masters using Modbus TCP and Modbus RTU. The network will deliver responses only to the Master which issued the queries using the appropriate protocol.

The individual settings are described in chapters 1–5.

Fig. 6.1: Modbus TCP, Slave RTU or TCP