Modbus PLUS communication


Thread Starter


I was trying to upload a Concept software program into a Quantum PLC with a Modbus+ configuration, i was using a RS232 serial cable(i hear that both RS232 and RS 485 will work). It was a direct connection between my laptop and the processor.

but just when i selected the port no. the communication failed (b4 even establishing:))

Where did I go wrong? any suggestions?
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