It is used to execute the signal processing of the host computer (LPT port), with the MACH3 CNC system software, and the electrical dynamics of the peripheral machine. It is suitable for CNC engraving machine, CNC lathe, CNC plasma cutting machine, laser engraving machine, CNC milling machines, machining centers and other machine tools. With MACH3 series host computer and software, it can be the most cost-effective CNC system. Features: 4-axis limit circuit with anti-interference on board. X+, This limit circuit does not occupy parallel port resources. It can also be connected to the P10 via the jump cap on the board. When the limit is triggered towards the + end, no matter how your computer moves, the motor can no longer move in the + direction, only supports moving the computer towards the end. Only when the end + limit is not triggered can the machine move towards the end + again. The 4-circuit motor control signal of X, Y, Z, 4 on the board, the whole circuit adopts the OC output of the transistor. Drive capacity up to 200MA. One port can be connected in parallel to 10 motor drivers or drive 4 relays at the same time. There is a special stop button interface on the board. Regardless of the movement of the computer, as long as the button is connected to two lines, the spindle and X, Y, Z, 4 axes will stop. Integrated charge pump function. All input interfaces have an indicator light. Each axis has an operational indication. A special high-speed chip is used to process input and output (I/O) signals. It is able to operate the machine stably, with the signal correction and enlargement features that eliminate unnecessary disturbance signals. The computer's LPT port supplies power individually, separating itself from power to other parts. Therefore, the computer and the machine tool effectively isolate each other. It makes data more secure, with added assurance of security and stability. There are 5 input signals, communicating with the host computer, which are isolated by optical coupling. Among the optical coupling isolation, P11 and P12 are high-speed, which can be used to connect the main shaft encoder, or the same demanding signal as the handwheel A, BThe 12V power output interface - OUT and 5V-OUT can be used to choose a necessary power supply, such as Hall sensor switch and proximity switch. There are 5 input ports, set to limit, origin, knife, start, stop, spindle speed input, MPG input and any other of the 5 functions. There are 12 output signals, which are allowed to control the output, supporting up to 6axlslinkage. Part of the output port is a reusable feature. Meanwhile, only one port can be used as a single function. There are 3 replays, P2, P3 and P4, which can support MACH3 control software programming. The activation or deactivation of the relay can be controlled via MACH3 software control. Each relay attracted an indicator lamp, which is more intuitive and practical. The 3 relays can be used to control the opening and closing of coolant, mist coolant, liquid coolant, etc. They can also be used to control the power switch of the electromagnetic valve device. P2 port is for spindle, P3 port is for coolant, P4 port can be set. High-speed optical coupling isolation is used to control the spindle rotation speed. The output port is parallel port P1, which can output PWM signal within 2.5KHZ. On the interface board there is a D/A circuit, with PWM at a 0-10V. The circuit can output 0-10V level to control the inverter which only has analog speed control in the market. So it can control the spindle rotation speed. It is important that the PWM output and the 0-10 V output can only choose one of two. They cannot be used at the same time. The interface board can be connected to the cathode or total output of the stepper motor, or servo drive (the servo motor must support digital signal). The output is