Welcome to our store! 1. USB POWER SUPPLY: Supports computer software such as MACH3 and parallel port control, USB power supply and peripherals 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 boundary of computer security. 3. 17 PORT 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 the 5-axis stepper motor. 4. OPTOCOUPLER ISOLATION: All 0-10V analog output voltage is isolated by the optocoupler and can be controlled by the spindle speed through the corresponding analog interface converter. 5. OTHER FUNCTIONS: P1 as PWM output can be controlled by the optocoupler input spindle speed controller and can be driven by common cathode or common anode input level 5V. Item Type: Stepper Motor Driver Board Product Material: ABS Motherboard Size: Approx. 90 x 60 mm / 3.5 x 2.4 inches 1 x Stepper Motor Driver Board (Blue) 1 x Dual USB Cable 1 x DB25 Cable Customers are our top priority. If you find any problems with your product after receiving it, such as damage or incorrect quantity, please contact us immediately. We strive to provide you with the best after-sales service.