Z code looses the computer after a code post and just keeps going. Nothing on the computer stops it. Only E-Stop does and if you don't clear the DRO it will start back up when you reset the E-Stop.
Code G01 Z1.0000 and the DRO moves to 0.0001 and that's where it stays. The mill will lower till it bottoms out or you hit E-Stop.
I was resetting the steps when this started and I have checked the steps and that is right, I checked the stepper cable and it has continuity at all pins, , Whats next please.