5 axis CNC Breakout Board with optical coupler For Stepper Motor Driver MACH3 all of the input signal, all the light lotus isolated, which can be accessed emergency stop on the knife, the limit to protect computer security. USB power supply and peripherals powered phase separation to protect computer security. can be accessed by a common cathode or common anode input level to 5V drive. Quantity: 1x 5 axis CNC Breakout Board + cable