Hello,
I have two ZWO cameras; an ASI385MC and ASI174MM and would like to use either for autoguiding using the ST-4 that each have. However, my mount is a Losmandy G11 with Gemini 1 GoTo bought in 2001 and doesn't have a ST-4 compatible autoguiding port. It is similar but the Common pin is high (+5V) and the direction pins are 0V. I gather this is the reverse of the ST-4 (Common is 0V and direction pins are pulled high ,+5V). Therefore I will need some kind of invertor to connect the camera to the mount and really need to know the camera output circuit on the ST-4 port to design something. Does the attached represent the output circuit?
Thanks