Kirk Wallace wrote: > > but I used the paradigm of a switch closure at the time I did the > installation, after giving it more thought and referring to: > http://pico-systems.com/images/univstep.png > > it looks as if the inputs already go to an opto-isolator on the UPC > anyway. It may be that a resistor (and a general purpose diode for > reverse voltage protection) in series would work just fine. Limiting the > current to the opto LED is the primary issue. The UPC and turret encoder > 12V supply grounds would need to be tied together in order to close the > circuit. The logic sense may need attention too. > Yes, that is what I'd recommend. I think only the diode is needed, the resistor is already provided in the UPC board.
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