I have a cheap generic Mach3 setup and I want to send a signal from my PLC to start the CNC program and I want the CNC program to send a signal to the PLC indicating that the program is completed.
I go to Config - Ports and Pins - Input signals and i see Input 1 thru 4 and I see OEM Trig 1 thru 15.
I also see the Port# and Pin Number for each of these. I honestly don't know what to do with them. I am not using a serial connection. I simply want to run a wires from my PLC output to the Input of the CNC card and run a wire from my CNC card output to my PLC input.
Does anyone know how to reassign these using my CNC card, 4 inputs and 4 outputs.

Thanks in advance