[CAD_CAM_EDM_DRO] Compumotor SX6 drives - how to make them Step/ Dir mode??

Hi All

I have come by 4 Compumotor SX6-Drive units and I would like to
run them in Step/Direction mode.

Does anyone know if it can be done and how ???

All the units work using the serial port. I have read the
manuals and Im still as confused as I was when I started.

Thanks
Mark