Now that I removed the DB9 connectors and my black / red wires are connected straight thru from panel to clip / touch plate I thought it’s time to give a new try.
Went back to the original Mach3 setup (put pull-up/down jumper back to pins 1 and 2, re connect the Estop and all limits) and using the same wiring setup as per my 1st post (black to 5V with a 120 Ohms resistor, red to pin 15) I get the following
Active Low setting (Green)
LED light on Diagnostic screen is ON
When I touch the clip to the Chuck LED remains ON but when I touch the plate to the bit LED goes out
Volts = 5.12 but with the red meter tip to clip and the black meter tip to the plate. Otherwise I get a negative reading
Active High setting (Red)
LED light on Diagnostic screen is OFF
Volts = 5.12 but reversed as above (red meter tip to clip and black meter tip to the plate)
Nothing else was done because I don’t understand the meaning of the above
I’m sorry stirling for all the time you wasted but as I mentioned, in my mind the wiring was good as per my continuity test when I installed the black / red wires