Sorry, my previous note was about guiding with the NexStar driver through the NexStar+ HC. It is confusing with all the permutations I have done.

But to answer your question: Following your instructions, when I use the Celestron AUX driver either through the NexStar+ HC, with the hardwired serial interface, or the Wifi adapter, autoguiding with PHD2 does not work when attempting to guide through the mount. The mount refuses to budge during calibration and seemingly is not receiving the pulse commands as manual guiding does nothing either. Nothing is displayed on the PHD2 window at the bottom where you would normally expect the guiding pulses to be decoded (e.g. an arrow, direction and duration in ms). Well not completely nothing. When manual guiding, the decoded pulse are intermittently and very briefly displayed.

It is different when using the NexStar driver with the NexStar+ HC. In this case autoguiding through the mount appears to work as expected. My conclusion is that the NexStar+ HC takes guide pulse commands from the Pi and translates them into motor movement commands of an equivalent duration. I'm not sure this will work in practice because of the odd way I have to fool the HC into doing the initial fake alignment. I will try on the next good night.

Mike

Read More...