Quote Originally Posted by Chaz View Post
Yep, 12V when high and 0V when not. This is on its on Power Supply. So not using the 0V or 24V from the controller. Should I join the grounds?
Yes, the 0V will need connected.
My only concern is how the SZGH will handle having 12V on the input. I'd think it will work OK, but I'd be checking the relevant inputs are switching cleanly.