Description: Serial communication interface standard through the use and development, there are already several. But they are in the RS-232 standard based on the improved formed. Therefore, to RS-232C-based discussion. RS-323C standard is the U.S. EIA (Electronic Industries Alliance) and BELL companies announced in 1969 with the development of communication protocols. It is suitable for data transmission rates in the 0 ~ 20000b/s within the scope of communication. The standard serial communications interface issues, such as the signal line feature, the electrical properties have been clearly defined. As the access equipment vendors are manufacturing and RS-232C standard compatible communications equipment, so it as a standard, currently in widespread use in computer communication interface.
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