CNC 5 Axis Breakout Board Interface Adapter For Stepper Motor Driver Mill/Input CNC interface board, you can make your computer into a powerful CNC controller. The maximum matching 5-axis stepper motor driver. The two-stage signal processing, signal transmission smooth, powerful anti-jamming. 5 input interface to define the emergency stop, limit, points in the knife, etc. Relay output control interface, can be accessed by the spindle motor or the air pump, water pump, etc.