You have a CNC4PC BOB and Kelling stuff. Go to Keling's site and read thru their setup doc. CNC4PC has many usefull docs, too.
If we're going to help you here, we'd need a LOT more info on what you have setup and what you've done so far. LOTS MORE! Start with Mach docs, Keling docs, and CNC4PC docs and single step your way thru the entire setup from configuring the parallel port to ports & pins, and enabling the bob and all sorts of stuff.
Oh, and one thing, US Digital encoders require a DIP switch on the G320X's to be set. One post you said G320, one G320X, so we're confused.