I ordered a pair of proximity switches that function on 5 VDC. I have the USS powered with an external 5vdc power supply.

The prox sensor looks pretty standard with 3 wires. brown is V+ blue v- and black output signal.

I connected the brown wire to 5v on the BOB, blue to GND and black wire to pin 15.

The led on the sensor comes on when I move a piece of metal near it but I get no indication of it working in the diagnostics screen in Mach 3.

I have it enabled in the input pins window.

What am I missing here?