Im trying to set up a touch probe on the C82 board.  I am using Pin 10 port 2. the probe is NPN, Normally Open and two wire.   The Probe is the WP-500, there are several companies selling it.  It came with no documentation.  The site says that the red wire goes to com and the black wire to signal.   I think that means that the black wire plugs into pin 10 port 2 and the red is com +5volts. For the ports and pins setup, input it does not matter if I set it to active high or low. I get no change of state when i trip the  probe.  Any ideas would be great.