I’m assuming my Pyxis LE behavior is the same as the 2" Pyxis. The magnetic sensor doesn’t move, of course, and everything is relative to that. The home function performed at power on finds that position and then returns the rotator to instrumental position 0. I would suggest you also make the homing position be Sky PA of 0 as well and do not attempt to use Sky PA in the Pyxis Commander. Do all your rotator moving in SGP.
In the Pyxis LE “Advanced Setup” dialog, you can set rotator data there, as well, but again, I recommend leaving them at factor default. The “reverse” option tells the rotator which way to move when commanded by a controlling app (SGP). Unfortunately, I don’t remember my setting off the top of my head. For example, if the rotator is reporting 90 degrees to SGP and in SGP you enter the command to move to 100 degrees, the rotator will move 10 degrees BUT when SGP does a plate solve it may show 80 degrees. The rotator went 10 degrees but in the wrong direction. If you see that happening, you will need to change the “Reverse” option on the Advanced Menu.
So, the rotator will home at power up and leave the rotator at instrumental position angle 0. If you now connect to the rotator in SGP, SGP will show a position angle of 0. At some point before starting your sequence, you need to do a “Solve and Sync” to get an accurate DEC and RA and to get the rotator’s current Sky PA. As soon as the solve and sync completes, you will see SGP change the rotator’s position to match the plate solve’s Sky PA. SGP now knows how to map the camera’s Sky PA to the rotators instrumental PA. For the rest of the night, only move the rotator from SGP or simply let SGP manage the rotator position by itself.
Note, you can “park” the rotator from SGP by using the “Zero” button. This moves the rotator to instrumental position 0 – same as doing a park.
To test the “reverse” option, do the following:
- After connecting to the rotator in SGP, you will see position 0.
- Do a solve and sync to set the current rotator position to the Sky PA of the camera.
- Enter a value in the SGP rotator position box that is 10 degrees bigger than the current Sky PA
- Click “Set” to move the rotator.
- Do a frame and focus frame
- Right click and select plate solve
Does the plate solve show the expected Sky PA? If it is off by 20 degrees the rotator moved in the wrong direction. This means the current reverse option is incorrect and needs to be flipped.