Quote Originally Posted by neilricketts View Post
I have tried the active low in mach 3 which just causes the z axis to go in opposite direction. For example press up it goes down, press down it goes up.
I should have mentioned that you have to find another way to reverse the axis direction. Simplest way is to change the "Direction" signal from active-high to active-low (or vice versa) when you change the step polarity.