I recently decided to try a night of imaging where I had two targets in a sequence file. The first target was acquired east of the meridian and the sequence performed an automated meridian flip with camera rotation properly and the target finished about 2AM. The scope was pointing to the north west at the end. The second target required the scope to point back to the east of the meridian and the scope did a “reverse” meridian flip, acquired the target (with camera rotation) and began tracking. However, immediately, the guiding began a “run away” so I stopped the sequence; performed a new calibration of PHD2 and resumed the imaging run without further problems.
Being 2AM, I did not take the time to trouble shoot the guiding issue but thinking about it later, it seems like PHD2 did not recognize that a reverse meridian flip had occurred and did not flip the calibration data.
I know that during the first meridian flip, SGP told PHD2 to reverse its calibration but I am thinking that when the second target was acquired, SGP may have not told PHD2 to reverse its calibration again.
PHD2 is connected to both the rotator and the mount but the option in PHD2 to flip the calibration data is unchecked since SGP is telling PHD2 to flip.
I did not bring any of the log files home with me but it seems like SGP did not tell PHD2 about the second meridian flip.