论文中英文翻译：RS-232通信协议及接口标准.doc

英文文献 RS-232 communications agreements and standard interfaces RS-232C outlined Serial communications interface standards through the use and development, there are already several. But in RS-232 standards are improved, and formed the basis. RS-232C U.S. EIA (Electronic Industry Association), together with the Bell companies in 1969 announced the development of communication agreement. It 0~20000b/s suitable for data transmission rate in the context of communications. This standard for serial communications interface on the issues, such as signal line functions, electrical characteristics were clearly defined. Since passage of the production equipment manufacturers are compatible with RS-232C standard communications equipment, and therefore it as a standard, is now widely used in computer communications interface. In discussing the content of RS-232C interface standards before on two points : First, long-range communications link initially RS-232C standard data terminal equipment DTE (Data Terminal Equipment) and data communications equipment DCE (Data Communication Equipment) developed. Therefore the standards and does not consider the application of computer systems. But now it was widely borrowed for computers (more accurately, is a computer interface) between the scales of engineered with terminal or connecting standard. Clearly, some of the requirements and standards and computer systems is inconsistent, and even contradictory. With this background knowledge, we RS-232C computer incompatible with the standards of local not difficult to understand. Secondly, RS-232C criteria mentioned sending and receiving are standing DTE position, rather than standing at the position of DCE to the definition. In computer systems, often between the CPU and I/O Equipment transmission of information both DTE and therefore both sending and receiving. RS-232C interface standards RS-232C standards (agreement) is the full names EIA-RS-232 standards, including EIA (Electronic Industry