I am a newbie with a mac.
I have just bought a 5500mw A3 laser and I am not familiar with windows.
I find out this amazinig online Grbl software http://chilipeppr.com/grbl
I installed the serial-port-json-server on github
and after a little fidling the thing stated moving... wow.
I was wondering which G-code commands you need to turn on and turn off the laser?