Does the driver in mach3 send clock signal to my controller board? If so what pin on the parallel is it sending it to. Thanks Art

It sends them to whichever pin you have set in Ports and Pins, Motor Outputs, for each axes step pin.

Hood

Thanks

That would depend on What you mean by controller.

(;-) TP

I will explain. I had a Hobby CNC 4 axis board that went Kaput. They no longer sell a 4 axis board so I bought 2 - 3 axis boards. I put one together and it works fine with all three axis. So I put the second board together with only the x axis driver chip in to act as the A axis and jumpered pin 2 and 3 of this board to pins 8 and 9 on the first boards serial port. but the fourth axis motor has power but it is not moving. So I wondered if there was another signal I had to get from the second board to the parallel port which is suppose to act as the A axis. Thanks Art

Could it be  your second board needs an external power source?

Hood

No I have power to the motors. I thought maybe I needed to connect a enable pin so I connected pin 1 on one board to pin 1 on the other (parallel port) but that didn't work. This is why I was trying to understand every pin that mach uses on the parallel port. Thanks for your help especially because its more of a electronic problem and not mach per se. Art