Hi Paul,
Very strange indeed. I know from my experience that you can actually control the TVC & PEC buttons via the autoguider port, as the Losmandy uses a funny TDM system for controlling guide movements and button pushes.
I have seen this type of thing during the development of starmate, but since I sorted it out, I have never since had a problem.
Seeing as this is a "new" porblem, then it is possible that the fault is in the mate. Perhaps a loose solder joint, or even a loose joint in the connectors at either end.
Have you tried a different guide cable from the mate to the Losmandy?
Cheers
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