How does the altitude limit work?

aruangra

I see the altitude limit setting in the ASCOM driver / Advance tab. I tried to control the AM3 mount by slewing the mount beyond the meridian (Alt = 90deg) using NINA and the hand controller. The limit did not stop the mount ! as seen in the photo below.

How does the limit work? Please advise. Thanks.

aruangra

I did the extensive test of the latest ascom driver and mount firmware to investigate what is wrong with the altitude limit. I find that the lower altitude limit works fine but the upper limit, which is very important for preventing pier collision, does not work as it should be. The current algorithm works as the first figure. The mount LITERALLY uses the altitude in the alt az coordiate for checking the upper limit. But what 99.99% of mounts do is on the 2nd figure. The upper limit should be referenced to the meridian. The red zone is the NO GO zone.

ZWO... please update this bug. Thank you.