IR data transfer is used widely in data communication. Infrared devices have got a series of advantages such as small sizes，low power consume，cheapness and so on. It is applied in colorful TV，audio equipments，air conditioners and other electrical appliances and toy devices have also used infrared systems. In the industrial field， data transmissions with infrared devices is more popular. Using infrared data transfer is not only safe and reliable, but also has got lower electrical interference.
The subject of design is based on the SCM infrared data transmission system，it mainly consists of the AT89S52 SCM control module，the 4×4 keyboard input module，the display module， the infrared transmitter module，the infrared receiver modules and so on. By the SCM Programmed controlling, Main function of the system is to achieve infrared data from a primary station to the secondary station and showing the data what was communicated at the same time，By infrared devices to solve the point-to-point data transmission, the system is instead of the traditional wired data transmission. Thus the system has got good functions such as rapidly speed, stableness, reliability and so on.
Key words：AT89S52 SCM， LED Digital Display ， Infrared Data Transfer
