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Gday Chris
There is no way i can think of that anything associated with the rs232 cable could affect the power LED. There are only 3 connected wires in the rs232 cable and they are Tx/Rx and ground, so no idea where any power comes from.
As Damien noted, try doing a loopback test on the adapter by itself then adapter + cable to see what happens there.
My PEC editor allows you to send and receive data
so you can use it to do the test if you want.
If that works, try connecting to the mount when it has no power cable connected ( ie batteries only )
Andrew
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