Abstract
Along with the computer system application and the microcomputer network development, the unimportance which the correspondence function more and more reveals. Here said the correspondence is a computer and the outside exchange of information. Therefore, the correspondence already includes the computer with the external instrumentation between, also includes between the computer and the computer exchange of information. Because the serial communication is in a transmission line a pass-along message Pam, uses the transmission line are few, and may draw support from the ready-made telephone network to carry on the information transmission, therefore, suits specially in the long-distance transmission. Is distanced not the far person - machine commutation equipment regarding these with the computer and the serial storage external instrumentation like terminal, the printer, the logical analyzer, the floppy disk and so on, uses the serial mode exchange data very to be also common. In the real-time control and the management aspect, use in the multi- Taiwan microcomputer processor composition graduation distributed control system, between CPU correspondence all is the serial mode generally. Therefore the serial interface is the microcomputer application system commonly used connection. Serial communication is refers supposes uses a radical with the computer between according to the holding wire(Moreover need grounding, Possibly also needs the pilot wire). The data place carries on the transmission in a radical according to the holding wire on, each figure according to all occupies a fixed time length this kind of mailing address use the data line few, may save the correspondence cost in the remote communication, certainly, its transmission speed is slower than the parallel transmission.
Keyword: RS-232 ，serial communication ，tripod head control
