Features 1、Fully support for MACH3 and other computer software that supports parallel port control. 2、USB power supply and peripheral power supply are separated to ensure computer security. 3、12-24V wide peripheral voltage input, with anti-reverse connection function. 4、All input signals are isolated by optical coupling, and can be connected to emergency stop, tool setting, limit, etc. 5、One-way relay output port can control the spindle switch. The output port is P17 port. Specification Features: 1. Fully support for MACH3 and other computer software that supports parallel port control. 2. USB power supply and peripheral power supply are separated to ensure computer security. 4. All input signals are isolated by optical coupling, and can be connected to emergency stop, tool setting, limit, etc. 5. One-way relay output port can control the spindle switch. The output port is P17 port. 7. Open all 17 ports, can be connected with optocoupler drive, can control 5-axis stepper motor. 8. P1 acts as a PWM output and can control the spindle governor with optocoupler input. 9. Can be connected to the common cathode/anode drive with input level of 5V. Specification: Package weight: Approx. 335g/11.8oz Package list: 1 * Stepper Motor Interface Board 1 * USB Cable 1 * Parallel Port Cable Package List