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Modbus device ID

The company I work for is developing a controller that has three
communications ports: two RS485 and one TCP. Modbus TCP and Modbus
RTU Master/Slave will be implemented. It has been proposed that each
port have a different Modbus device ID, rather than one global ID.

I contend there is no benefit to this, and only adds confusion for
integrators. Does anyone know of a precedent for this?

Thanks in advance.
 
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