I'm over thinking this mos likely. I'm hooking up the steer switch to Brian's PCB V2. The schematic shows just power and com hooked up. I'm stuck on that should have a ground hooked also. Please confirm that I should follow the schematic and quit thinking.
All you need to connect is the output (middle one) and ground (Com). What you are doing with the switch is just grounding out the little diode in the optocoupler to turn it on. That is what makes it a very good safe input. If you short it out, all it does is turn on. If you put it to 12v it will just stay off. But definitely don't connect the +v to ground. Attached is the schematic, just ask again if you need help or more explanation.
In summary connect the "O" and "Com" to the switch. That's it.
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