Features: It can be connect to driver with combined negative or positive input level of 5V. Board printing all port name at glance. Open all 17 ports to connect to an optically coupled driver to control 5-axis stepper motor. P1-, as PWM- output, can control the spindle governor with optical coupling input Fully support MACH3 and other support parallel-port control computer software. USB power supply and peripheral power supply phase separation, to ensure computer security. Peripheral wide voltage- input, 12-24V, and anti-reverse connection function. All the input signals are isolated by the optical-lotus root, can be connect to the emergency-stop, limit, etc., to ensure computer safety. One-relay output port, can control the spindle-switch. The export P17-. 0-10V analog-voltage output isolated by optical coupler can control the frequency converter with corresponding analog-interface, control spindle speed. The output outlet port P1-. Specifications: Material: Plastic Note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Breakout Board