My friend bought a CNC table that I'm helping him set up and learn to use. When the DC power supply for the motor drivers is plugged in the motors lock in place and nothing can be moved by hand. I'm wondering how to unlock the motor(s) for a given axis without turning off the power supply. The driver are DM542As with ENBL+ unconnected. It's my understanding that this is normal and that ENBL+ is held high internally. If I connect it to Common, maybe through a resistor, will that disable the driver & unlock the motors? If not, I suppose we could have switches to turn the power off to each individual axis's driver(s) to unlock the motors that way.