通信接口协议综述（Overview of communication interface protocols）.docVIP

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通信接口协议综述（Overview of communication interface protocols）.doc

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通信接口协议综述（Overview of communication interface protocols） Communication interface protocol overview.Txt22 genuine wine, the longer the year more mellow thick type; sincere is the fireworks, it is beautiful bloom only in height; sincerity is the flowers, the fragrance delivery on hand. A lonely heart needs love; a cold heart need the warmth of friendship; support and comfort need to force a desperate heart; a pale heart sincere help; a full alert closed door is need sincere this key to open it! Overview of communication interface protocols (Reprint) -------------------------------------------------------------------------- (collection of data collection, original, integrated 232, 422, 485, USB and network communications, etc.) In the field of data acquisition and data transmission, a large number of interfaces are adopted, and the monitoring system involves more serial communication interfaces and network interfaces. Serial communication protocol Communication between a computer and a peripheral or computer usually comes in two ways: parallel communication and serial communication. Parallel communication refers to the simultaneous transmission of data. Parallel mode transmits data fast, but it occupies more communication lines, and the reliability of data transmission decreases with the increase of distance. It is only suitable for data transmission at close range. Serial communication means sending data one by one on a single data line in turn. In the sending process, each send a data, and then send second, and so on. When data is accepted, each time it is accepted one by one from the single data line, and then they are put together to form a complete data. In long distance data communication, serial communication is adopted generally. It has advantages of less communication line and low cost. 1, the basic concepts of serial communication (1) synchronous and asynchronous communication modes There are two basic communication modes in serial communication: synchronous s