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i have CQM1H CPU 51 PLC.still it not communicate with the system.I have cx programmer version v 9.5.
using cables: CN 226-USB CIF02 Combination.
When i connect auto online,it not showing this plc name.Only showing like c series,cj series, like.
The cable that you are using is not listed in the datasheet for the controller.
I believe that you have the wrong cable.
The above link will give you the RS232 pinout.
I have had success communicating using the USB port of a computer using the Ugreen USB to RS232 cable.
Hope this helps you out.