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Dear members,

I would like to ask you for advice.

Currently I have begun to use serial communication for OMRON PLC with use serial communication module SCU41-V1.

My first application with use TXDU instruction in program was succefully. But for my purpose I need also recieve any data from the COM port.

So when I set RXDU by instruction manual... Nothing recieved after send data via my PC.

Light indicator on PC front panel is blinking after I send any data to PLC, but RXDU does not get any data to store it for my D memory.


Serial port 2;

Unit: 3;


I have checked proper version of my card but it seems to be good.


Is necessary use any exactly format to send to COM port for RXDU?


Can you please help me?

Best Regards,





Edited by JiriH

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