[amsat-bb] question on g5400 controller

I am trying to help out someone with a controller. The control box works manually but does not work with his Sat32 controller. I am not familiar with the software but am trying to diagnose the control box. I am assuming a few volts on the DIN connector that correlate with the relay switching transistor should cycle the relays. If my thinking is correct how many volts would I apply to the DIN pins to prove out the controller is working correctly? Hope this makes some sense. Thanks Mike WB8PFZ