Gee, a PMDX-125 and not a PMDX-126. Haven't thought about those is a while. There were several revisions of the PMDX-125, written just above the serial number block (like "E6", "D5", etc.). Please tell me the revision, along with your DIP switch settings.
Is that why the Inputx pins don't light up when the Pin 15 input on J12 or J11 is connect to the J12, J11 GND?
and
Only Pin 15 LED lights up for either J12,J11 but mapped to Input 1 does not light the indicator on the MACH diagnostic screen like the Pins 10..13.
Let me see if I have this straight (presuming that you have the ESS Port 1 connected to the PMDX-125 "Port 1" (J16), and ESS Port 2 to PMDX-125 "Port 2" (J17):
(1) When you assign, say, Port 1 Pin 11 (from PMDX-125 connector J12) to Mach3 input signal "INPUT1", and then connect the screw terminal for pin 11 on J12 to the adjacent GND pin, the LED on the PMDX-125 board for pin 11 turns on AND the indicator on the Mach3 diagnostics tab for "INPUT1" also lights up. Is that correct?
(2) And if you instead assign Port 1 Pin 15 to Mach3 input signal "INPUT1", and then ground the pin 15 screw terminal the LED on the PMDX-125 board for pin 15 DOES turn on but the Mach3 indicator for "INPUT1" does NOT turn on. Is that correct?
(3) And if you assign Port 2 Pin 15 (PMDX-125 connector J11, signal "D") to Mach3 input signal "INPUT1", and then ground the screw terminal the LED on the PMDX-125 board for pin "D" DOES turn on but the Mach3 indicator for "INPUT1" does NOT turn on. Is that correct?
In general, whether or not the pulse stretching is enabled, the input signal on the PMDX-125 pin 15 input should always get to the PC (and therefore to Mach3). The only difference is that, *if* the signal on pin 15 is toggling, the PMDX-125 may make the low (or high) portion of the signal slightly longer. And pulse stretching should have no effect on the PMDX-125's J11 "D" input signal (which appears as to Mach3 as Port 2 pin 15).
I am curious that (if I read your message correctly), both the J11 "D" signal and J12 "pin 15" inputs on the PMDX-125 fail to be read by the PC. So let me know if my above interpretation is correct (all 3 items). And if you haven't tried exactly that configuration, try it and let me know what you see.
Bob