Currently, in various control systems in laboratory and industrial applications, serial ports are commonly used data transmission channels between computers and external control systems. Since serial communication is convenient, it is widely used. However, serial communication is used in real time, speed, data, etc. When the computer's parallel port transmission data is one-time transmission 8 bits (one byte) or more, because the amount of transmission is large, the transmission speed of the data is fast than the serial port, in many control systems that must pay attention to the transmission speed. The connection with the PC parallel port and it is a good solution.
This paper introduces the application of the PC parallel port in the microcontroller and other control system as a digital I / O port. In the control system, there are many digital switches, digital control signals, digital signals, etc., can be collected through the computer parallel port; and the collected digital signals form a digital control signal after processing, and then from the parallel port of the computer. Outputs various automatic controls.
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