MACH3 engraving machine cnc 5-axis stepper motor driver interface control board with optocoupler isolation. One channel relay output port can control the spindle switch, and the output port is P17 port. One channel through the optocoupler isolation 0-10V analog voltage output, you can control the inverter with the corresponding analog interface, control the spindle speed, and the output port is P1 port. Opening all 17 ports can be connected with optocoupler driver, and can control the 5-axis stepper motor. As a PWM output, P1 can control with the optocoupler input spindle governor. It can be connected to a positive or negative and input level of 5V drive.