I am thinking of adding laser engraving capabilities to my OX CNC. I just want to engrave wood (for now) I am looking at the laser engravers on ebay. How is the laser configured to use Mach3 to turn on and off? I need to know specifically what to put where.in Mach3 to turn the lasers on and off. I'm using a Gecko G540 -4 stepper driver to drive my motors. http://www.cncrouterparts.com/gecko-g540-4-axis-stepper-driver-p-40.html) Thanks for any help you can give me.