Hi Peter,
In your example, the hand controller thinks Bellatrix is on the "same" side of the Meridian from the beginning, so you can slew normally to it, while ASIAIR thinks the star is on the other side of the Meridian, so someone added a Meridian flip.
This could be a bug in the ASIAIR firmware, but it could also be associated with Time (the usual hour angle, right ascension and local sidereal time association, and of course, the local longitude).
If the error happened when Bellatrix is within 15 degrees of the Meridian, even the Daylight Savings Time setting can be the source of the problem.
I would recommend that you compare the Time, Longitude and UTC offset values in the hand controller with the values in the ASIAIR with a fine tooth comb, and also double check the Daylight Savings setting in your hand controller.
At least you can do this in daylight and indoors, and not waste any dark time. Just be prepared for unintended movements.
You can pick two stars within say, 10 degrees of the Meridian (on either side of it meridian), and another star that is more than 15 degrees from the Meridian to start your tests. The result may be enough to identify the source of the error, without tediously going through *all* of the settings that I mentioned above.
By the way, if there is a problem with Meridian flipping, you might also have times when you cannot move to a star because it is "below the horizon." Hopefully, fixing this problem will fix any other associated problems too.
Good luck,
Chen
