Got it! I figured out my issue, W3 needs to be in the "UP" position to supply +5vdc over 18-26.
Thanks for all the information. I have mine up and running now.
Originally Posted by rdsi
Yeah, the 5V supply runs both the MESA 7i92 and relay board. It is wired to the MESA board and comes across to the relay board through P1. This is my final schematic:
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