Abstract
IR data transfer is used widely in data communication. Infrared devices have got a series of advantages such as small size, low power consume, functionality and cheapness and so on. It is widespread used in the colorful TV, audio equipments, air-conditioners and other wireless remote control toys. The using of infrared systems is also used to transfer data. In the industrial field, the use of infrared equipments to transmit a wide range, using infrared data transmission is not only safe and reliable, but also has got lower electrical interference. The subject of the infrared calling system based on broadcast, it mainly consists of the AT89S52 SCM control module, keyboard module, LED display module, the infrared transmitter module, infrared receiver module, voice broadcast module and so on. By the SCM programmed controlling, main function of the system is to achieve infrared data from the transmitter to the receiver, the main function is to achieve the hospital's call to the terminus in front-end system using infra-red wireless transfer, the receiving end in the number of hospital beds to call display and voice broadcast .
The system can prompt the patient to allow medical staff to understand the needs of front-end due to the use of infra-red remote control, more convenient to call the nurses. In addition, the system is cheap, simp, simplictly of operator and wide application.
Keywords：Infrared data transfer， ISD voice broadcast， LED digital display
