![]() ![]() You'll have to look at the manual for your BOB and find out what type of inputs it has then you'll know how to wire it. That means the inputs are pulled to DC Common with a resistor and you need to connect the boards +V to the pin and activate the input. Some BOBs are active HI, and the CNC4PC boards typically are this way. ![]() When you connect DC Common to the pin you pull the pin LOW and activate the input. Most input pins are pulled HI, on the circuit board they have a resistor that is connected between the pin and the +V of the board. What you need to do in a general sense is complete a circuit between the DC Common and the input pin. By that I mean that DC Common is not the same thing as AC (earth)ground.
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