CNC Machines Laser Upgrade InstructionsAcro System & BlackBox Set-Up Manual for 2W and 6W Laser Head Acro System Laser Upgrade - Software Setup 8. Software setup. To cut or engrave, it is necessary to generate the appropriate G-code using the following commands: M4 Laser ON M5 Laser OFF SXXX PWM duty where XXX is a number between 0 and 1000 (e.g.: 0 = 0% and 255 = 100%