I just bought a generic DIY rotary attachment for use with my Universal Laser X2-600 CO2 cutter/engraver. The attachment comes with a connector with 4 pins (required for a 2-phase stepper motor) but my laser has a 9 pin connector (DB-9-F) that a rotary plugs into.

Does anyone know the pinouts of ULS' rotary attachment? (I'm an electrical engineer and can make an adapter but need to know the connections). I'm guessing a minimum of 4 connections are required for the motor plus maybe 2 more to tell the laser that a rotary is plugged and maybe 2 more for the home position. I've asked ULS but no reply.

Any help would be appreciated.