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Well, eventually I may have found a smoking gun. Today I tested the system with an old desktop PC with a built in serial port. Connecting this just to the Serial EQDIR adapter led to the usual effect: connects OK but looses comms during a slew to target. I regressed the software to earlier versions of Ascom/EQMOD without effect. However, I then put an in-line capacitive filter between the serial cable and the EQDIR module, and would you believe it everything worked fine. I removed the filter and the problems returned.
So the issue may be noise pick up in the serial cables, and the 'working' PCs I had earlir may have been just because the cables lay differently. I've set the mount to track now for a few hours to check if any comms errors appear, so fingers crossed!
Graham
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