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Hi all, I am having some trouble communicated with a Omron CP1H PLC from CX Programmer. The CP1H itself comes with two option boards (CP1W-CIF01) to allow for communications via RS232. The PLC also has standard USB access. When I connect my PC (Windows Server and Windows 10) to the PLC via USB connection I am able to communicate successfully. The only caveats are: The PLC program appears to be read protected (not related to USB I assume!) The system which I want to integrate the PLC with, Kepware Server, does not appear to support OMRON usb communications. Kepware Server does have support for connections over serial or ethernet so I am looking to make a connection via RS232. After some digging I realised the RS232 cable needed to connect the PLC to a PC is not your standard cable. I purchased the XW2Z-200S-CV RS232 cable and tried it in both option boards but CX Programmer is not able to make a connection. I used the auto-online, serial port sniffer and manual configuration. I must have cycled through all possible combinations of settings several times but no joy. I can see an led light on the option boards flicker when CX Programmer is attempting to connect so it appears that something might be happening. One of the option boards is already occupied by another device (which is working) btw. I did unplug that device and tried my own cable, again, no success! I also double checked the cable itself to make sure the wiring was working correctly, it appears to be fine. So my question is, does anyone know why the RS232 method is not working? Are there any options and settings I need to check? Perhaps I'm missing something obvious. Thanks!