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Configuration of Modbus services, operating modes and communication variables in ATS 48 ?

Modbus protocol is a master-slave protocol : only one device can transmit on the line at any time.The master manages the exchanges and only it can take the initiative.
It interrogates each of the slaves in succession. No slave can send a message unless it is invited to do so. The master repeats the question when there is an incorrect exchange, and
declares the interrogated slave missing if no response is received within a given time period. If a slave does not understand a message, it sends an exception response to
the master. The master may or may not repeat the request.

For More Info about Modbus services, operating modes and communication variables, thanks to Check the Attached Documents.
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