It would look like this. It's a USB to RS232 (9-pin) Cable. Around $15 USD. Product Requirements Windows 98/2000/ME/XP CD-ROM drive to use drivers/utilities CD Serial device with a 9-pin RS232 interface PC with USB interface
Here's one, but not image of the interface that would connect to the 3500. USB to 9 Pin "D" Connector - Adapter For Computers that don't have a RS-232 serial port, this adapter is ideal. Plug 6 ft. cable into your USB port, install software from included CD and your laptop computer can program your FTA receiver! retails for $25. using Google image, search 'usb pansat cable'
the first one will work use that and the null modem cable that came with your reciever most likly youll have to setup wich comport itll run on so itll work
