I have installed the USB driver for Visilogic from the Communication/USB tab in Visilogic.... or at least I've tried to. I have done this several times and still when I plug the PC into the PLC it doesn't even show up as a device. I'm not exactly sure how to select a COM port either. I open the device manager and can highlight anything and tab through the properties, disable, uninstall, etc. but there is no "select" option.
As for the TCP/IP, I believe it was error 210. It was suggesting that I check to make sure the cable was making good connection, told me to check IP, etc. I think you're correct about me not knowing the IP address. Is there a way for me to see the IP address of the PLC? I'm unable to contact the person who started this project and they left me with limited documentation.