Serial communication interface standards through the use and development, now has several. But they are in the RS-232 standard on the basis of improved formed. Therefore, in RS-232C-based discussion. RS-323C standard U.S. EIA (Electronic Industries Association) BELL companies announced in 1969 with the development of communication protocols. It is suitable for the communication data transfer rate in the 0 ~ 20000b/s range. The standard serial communication interface of the relevant issues, such as the signal line function, electrical characteristics have been clearly defined. Since access equipment manufacturers are producing compatible with standard RS-232C communications equipment, so it as a standard, has been widely used in computer communication interface.

20111101823449.pdf

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