To enable Modbus RTU on a serial interface the protocol setup per default has to be replaced by either Modbus RTU client or server, depending on required operation mode.
A serial interface supports only one protocol/operation mode at once.
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Right-click node “CAA_SerialCom” and click “Add object”.
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Select “Modbus RTU Client” or “Modbus RTU Server” and click “Add object”.
“CAA_SerialCom” is replaced by your selection.