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I'm happy to report that everything, including our external Jog device, is working as wanted. I still have to do the last of the fine tuning and deal with backlash settings, but otherwise, everything...

I have inverted the enable output, and also inverted the motor axis output.
The motors enable and work. I have a DRO so the XYZ calibration has been easy, but now I need to do the rotary table.
The...

You are right.
The default with the Mk2/4 was enable high, the default with the Mk3/4 is enable low.
Ticking the invert option for the enable pin has enable working as it should.
I would guess...

Hi,
Motor enable is turned on.
If I run a g-code file in TNG, the DIR pin will go from .2 to 5V. But enable stays at 0.2 volts.

But your comment that TNG won't break the Mk2/4 has helped because...

Hi,
I had a Mk2/4 that I suspect I broke when I tried the TNG software. Planet-CNC do warn you that TNG doesn't work (I didn't take notice beforehand) with the Mk2/4. What they don't say is that it...