Features: _x000D_ 1. Fully support for MACH3 and other computer software that supports parallel port control. _x000D_ 2. USB power supply and peripheral power supply are separated to ensure computer security. _x000D_ 3. 12-24V wide peripheral voltage input, with anti-reverse connection function. _x000D_ 4. All input signals are isolated by optical coupling, and can be connected to emergency stop, tool setting, limit, etc. _x000D_ 5. One-way relay output port can control the spindle switch. The output port is P17 port. _x000D_ 6. One-way optocoupler isolated 0-10V analog voltage output can control the inverter with the corresponding analog interface to control the spindle speed. The output port is the P1 port. _x000D_ 7. Open all 17 ports, can be connected with optocoupler drive, can control 5-axis stepper motor. _x000D_ 8. P1 acts as a PWM output and can control the spindle governor with optocoupler input. _x000D_ 9. Can be connected to the common cathode/anode drive with input level of 5V. _x000D_ _x000D_ Specification: _x000D_ Input voltage range: 12-24VDC _x000D_ Package weight: Approx. 335g/11.8oz _x000D_ _x000D_ Package list: _x000D_ 1 * Stepper Motor Interface Board _x000D_ 1 * USB Cable _x000D_ 1 * Parallel Port Cable