I discovered that the trigger output voltage of my 976 is 5V (as measured with a meter) instead of the expected 12V. I just noticed the 976 web page says the trigger is 5V, but the manual says it is 12V in two places. I don't think this is going to be a huge deal since for my application, I can just swap out the 12V relay with one that has a 5V coil.

I've emailed support about this and I'm waiting to hear back.