I have a prolight 1000 with stepper motors, there is a control box that contains a power supply and motor drive circuitry. I looked up the ICs that look like the stepper control ICs and they are ST L297's wich are stepper driver chips that take step and direction inputs. I have been told that this box connects to a motion card, but it looks like it could plug into a parallel port on a PC. Either way it seems it must take step and direction inputs, so I think it can run from Mach3. Has anyone done this or have any info on the pinout of the box?
Thanks