RioRand4 Axis USB Interface Breakout Board Adapter CNC MACH3 For Stepper Motor Driver Powered by RioRand Advanced Technology all output and input models by Philips dedicated high-speed chip processing, the signal is an integer, amplification, eliminating unnecessary interference signal. The operation of the machine more stable. USB and external power supply. The power supply isolation. Computer and data processing machines more secure;there is a special off the total electric power supply of the relay, the computer shuts down automatically when carving machine with other equipment, turn off all power. all of the input signal by the optical coupling isolation all of which P11, P12 port for high-speed optical coupling can be used to connect the spindle encoder, or hand-wheel A, B equal to demanding signal. there is a special relay switch coolant supply, support MACH3, G code programming (parallel port P3, G code to open M8, M9 off), the relay switch on the lights. Easy to determine the power off.