> with the GPS. If that doesn't work, I will have to test out the cable > with the ohm meter. I should see continuity between the USB pins and > the DB9 pin even with the shift circuit in place, correct?
No, you won't. There's an inverter and a transceiver in the way. Ground will be the only signal with continuity. Assuming you're talking about the 010-10813-00 cable and not a homebrew one, that is. Scott
