Also have same issue with guiding and AVX.

I polar align using QHY PoleMaster. Can't say enough positive things about this.

I then plate solve so scope knows where it is pointed. It has little issue slewing to a target although to get within 11 arc seconds it has to do a few plate solve / adjust cycles.

Once on target it tracks well enough that I can take 60 second exposure on 610mm scope without guiding.

But when I try to use the guiding software it either fails during calibration saying "failed to reach starting point after 21 iterations.... possible mount backlash problem"
or
it starts guiding and the performance seems pretty good for 5-10 minutes but then it drifts outside of the +/- 2 arc second window and even though correction pulses are being sent
it keeps drifting away. When the guiding seems to be working I can see it issuing correcting pulses and scope location in the drift plot does move back and forth like one would expect.

The star field image from the guide scope / camera seem fine. There doesn't seem to be any issues with that as far as I can tell. Certainly no complaints from software.

I've tried playing around with the guide settings but nothing seems to make it work.

Honestly wondering if the older ST4 cable might work better but have not tried this.

Sending pulses through the RS-232 interface seems suspect to me. Not sure how the software in the hand controller handles that.

Anyway would really like to get guiding working so I could take longer than 60 second exposures.

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