Hi Charlie,
If you have your mount connected in PHD2 with an ASCOM connection, then messages from SGP to PHD2 telling it about meridian flips are essentially ignored since PHD2 will make its own determination about side of pier and rotator angle independently of SGP.
Are you using an OAG so the guide camera rotates when you move the rotator? If so, then for rotation and pier flip to work automatically in PHD2 you'll need the following:
- make sure your mount is connected in PHD2 via ASCOM (not just ST4; if using ST4 must also connect mount as Aux Mount)
- make sure your rotator is connected in PHD2 using its ASCOM driver
- make sure you have the "Reverse Dec output after meridian flip" option set correctly in PHD2. The PHD2 help file describes how to make sure you have this set correctly.
- make sure you have your "Reverse sign of angle" setting set correctly in PHD2. You can confirm this by stopping guiding, moving the rotator by a significant amount, like 90 degrees, then starting guiding -- no runaway guiding indicates you have the setting correct.
You should be able to test this all standalone in PHD2 without involving SGP. If you see any problems, please post your PHD2 guide log and debug log in the PHD2 forum.
Andy