Features 1、USB POWER SUPPLY: Support computer software such as for MACH3 and parallel port control, USB power supply and peripheral power supply are separated to protect computer security. 2、SAFE CONNECTION: Peripheral 12‑24V wide voltage input, and with anti reverse connection function, can perform emergency stop to protect the limit of computer safety. 3、17 PORTS OUTPUT: 1 way relay output is used to control the spindle switch, all 17 ports are open, and can be connected to an optocoupler drive to control 5 axes stepper motor. 4、OPTOCOUPLER ISOLATION: All the 0-10V analog output voltage isolated by optocoupler can be controlled at the spindle speed through the corresponding analog interface converter. 5、OTHER FUNCTIONS: P1 as PWM output can be controlled by optocoupler input spindle speed controller, and can be driven by common cathode or common anode input level 5V. Specification Item Type: Stepper Motor Driver Board Product Material: ABS Motherboard Size: Approx. 90 x 60mm / 3.5 x 2.4in Package List 1 x Stepper Motor Driver Board (Blue) 1 x Dual USB Cable 1 x DB25 Cable