[Wavytone]

First I've heard of the PMC-8 too. Some compatible mounts/motors are listed on p.8 of the programmers reference manual, but what about others ?. It suggests the skywatcher mounts would be a no-brainer but what about iOptron and DIY efforts ?

Secondly the detailed instructions indicate its for stepper-motor mounts and functions by counting steps to determine position, i.e. no inputs for encoders, so it will be a case of sticking to the usual coffee-grinder approach of once calibrated to reference stars, the mount has to stay locked.

Could be used to:
- drive an altaz mount if you've added your own motors, e.g. an AZ8;
- add RA drive and autoguiding to a mount which doesn't have it, e.g. an EQ3.
- integrate with sky safari to make a goto scope...

And RS232 ? DB9 connectors have gone the way of the dinosaur...