Ribless USB Cable-Full Function
Set to COM3
CPS Doesn't allow me the option to change the COM port
How do I change the COM port assignment within the CPS software?
Unlike some of the other CPS's, the Pro Series does not have a specific menu choice to set your preferences.
HOWEVER!!!!!!! If you fire up the CPS, connect the cable and the radio, click on File and select Read Device. You will get a little window that ask you to set the comm port. Here you can select the comm port that matches your port setting in the PC's Devices and Printers.
If you click the Read button on the icon bar, the software presumes you've already set the port by doing what I just described above, and you will get the exact error you have been describing.
I know it's backwards and kind of hidden but that's how it works. So whenever you start a new programming session, don't use the Read button. Instead, File ---> Read Device and set your port.