Re: [APML] GM-8; will a relay box be needed?

[William Mattil <wrmattil@ix.netcom.com>]

Stuart Heggie wrote:

> Frank, based on what Mischa says, I have to ask whether you have the Gemini
> goto or the standard stepper drive? If the latter, your experiences are
> different and Mischa's is consistent with the directions on the web site. That
> all said, despite Mischa's bad experience, people are claiming the optocoupler
> will work. Hmmm. I think I just lost ground in my quest for understanding
> this.

This really isn't all that difficult to understand from an electronics point of
view. Any camera/autoguider that has built-in relays will work just fine on the
G-11 or GM-8 or GM-100. These cameras include, but may not be limited to. ST-4,
ST-V. If the camera/autoguider doesn't specifically state that it has relays then
some form of isolation is required. Optoisolators might be a bit better. The
relays in the Ag/Camera then replace the push buttons on the hand controller.
Normally open (usual) , or normally closed. Assuming that the Gemini has a hand
controller, it would be a simple matter to determine what types of switches (N.O.
or N.C.) and then wire the ST-4, or relay box to control the corrector. Then again
it could be that I am simply not understanding the problem :^)


Regards

Bill



_______________________________________________
Astro-Photo mailing list
Astro-Photo@seds.org
http://seds.org/mailman/listinfo/astro-photo