Program Menu->Global Settings->PC/IF CCDump [enabled]
Program a system - ensure you have good reception (nice solid 'T' being displayed).
Program a 'dummy' talkgroup (TGID that isn't used on the system).
Navigate to and HOLD on the 'dummy' talkgroup.
Cable!
Fire up Pro96Com - make sure you set the source in Edit->Decode Configuration to the proper model and know which COM port your radio is connect to.