Could even be a hardware issue with the circuits behind pin 5. The relay module looks like it connects with the 4 pin communications connection and pin 5 does not appear to be part of that interface. I agree with you that the relay approach should be less trouble. When everything is finished post the final results. Nice to let anyone following the thread know how things worked out.
Reply To: One Last Thing – Alarm Interface2017-12-22T21:35:32-08:00