1、A special high speed chip is used to process the input and output I/O signals. It is capable of making the machine work stably, with the features of correcting and enlarging the signals that removing the unnecessary disturb signals.2、The computer LPT port supplies the power individually, separating from the power supply of other parts. Therefore, the computer and machine tool isolate effectively. It makes the data more secure, with further insurance of security and stability.3、There are 5 input signals, communicating with the host computer, which are isolated by the optical coupling. Among the optical coupling isolation, the P11and P12 are high - speed, which can be used for connecting main shaft encoder, or the same demanding s4、There are 12 output signal, which is allowed to controlling output, supporting as many as 6 axis linkage. Some of the output port is reusable functionality. Meanwhile, one port only can be used as one function.5、There are 3 replays, P2, P3 and P4, which can support MACH3 control software programming. The relays on or off can be controlled through the control of MACH3 software. Each relay has attracted indicating lamp, which is more intuitive and convenient.