How do you emergency stop the slew?
If you have it available, there is an ASCOM abort command in my apps. Otherwise it is the power switch 
where would I find it in ASCOM ? thanks
OK,… ASCOM has many mount instructions. One of those is Abort.Slew().
Some applications have an Abort button, which sends this command. I cannot find it in NINA, but Cartes du Ciel has it on its Telescope interface. C2A has a stop button on its virtual hand controller. TheSkyX also has an abort button (but it does not implement homing, which is a PITA).
I wrote my own little application that does things like homing, parking and settings through ASCOM. I popped in an abort button.
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Thanks, I don’t use Nina only Cartes du Ciel so that will work fine. Now hopefully my pier ext. will be delivered today.