bought a Centroid KP-1 touch probe, Mach 4 not detecting probe trip.  Using ESS and C82 board with Machh4.  White wire from probe to Port 2 pin 9, active low, Black wire to Common. Green wire to ground and red to +24 volts DC. I hooked a volt ohm meter from pin 9 to common and the meter indicates pin goes to common when probe tripped. Probe goes from Greed LED to Red when tripped and verified with meter.  Mach shows no change of state. Diagnostic Page probe LED does not change. Probe enabled set to port 2 pin 9 active low. selected probe 0 in Mach4.  Any help would be great.