- LinuxCNC is open-source software for controlling CNC machines. - It runs on Linux with a real-time kernel for precise motor control. - Commonly used for milling machines, lathes, 3D printers, and ...

To enter into a mode connect momentarily either P3.0/P3.1/P3.2 to GND while spindle enable is off. P3.0 is dial, P3.1 is PWM and P3.2 is +/- buttons mode. Now enable the spindle and control the speed.