I am posting for the first time here, so please bear with me. I have been searching this and other forums for this particular problem, and although there is a similar topic earlier, there has been no suggestion of an answer.

Anyway, I've just finished setting up a 3040 Router (the Chinese version) with Mach3 and after a rather shakey start, I'm now at the stage where the X and Y motors are running sweetly; but not the Z axis.

It will only run in one direction regardless of which key is pressed.

I have swapped the pin allocation in Mach3-Config from either X or Y to Z and the same effect happens on that axis.
ie, if 2 & 3 are used for X and 4 & 5 are used for Y, leaving 6 & 7 for Z; I swap 2 & 3 with 6 & 7 - the single direction then applies to this 'new' axis.

This suggests that the signals from the PC are not getting through?
I've looked at the Config pages dozens of times, but nothing is leaping out that is obviously wrong. I've allocated different keys just to the Z axis, with the same single direction.
Has anyone had the same or similar problem with this?

have you got either 6 or 7 duplicated on another axis

No, looking at Config - Ports and Pins, it shows that each pin is unique and only appears once, Pin 1 up to Pin 7.

I might mention here that I'm using the Demo version of Mach3 - could that be doing (or not) something?

shouldn't make any difference

can you wire the z axis to 8 and 9 and try that

Can you attach your xml please.
Hood

Yes, tried that, nothing happens when I press the +Z or -Z keys...

BUT! When I restored the Z axis back to 6 & 7, I get both directions !!! So it is now working correctly !!!
Not only an Angel but a Magician too!
What's going on here - I'm not comfortable when things that haven't been working suddenly start to work...

Ok, I'll attach the xml file

Here is the xml file.

Ok your problem is you have Port2 set for the Z Dir

Hood