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Gday Colin
I have no idea what to expect when plugged in the way you describe.
The PC Rx line may show something, as that is data being sent from the scope ( and the scope is the master controller ). The PC Tx line would not normally show anything ( as its not connected to the PC ) as the PC is the master in that case.
You really need to do a continuity test of the cable when it is unplugged to confirm its wiring is correct.
Andrew
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