04-10-2010, 10:20 AM
Introduction
Due to it’s relative simplicity and low hardware overhead (as compared to parallel interfacing), serial communications is used extensively within the electronics industry. Today, the most popular serial communications standard in use is certainly the EIA/TIA–232–E specification. This standard, which has been developed by the Electronic Industry Association and the Telecommunications Industry Association (EIA/TIA), is more popularly referred to simply as “RS–232” where “RS” stands for “recommended standard”. In recent years, this suffix has been replaced with “EIA/TIA” to help identify the source of the standard. This paper will use the common notation of “RS–232” in its discussion of the topic. The official name of the EIA/TIA–232–E standard is “Interface Between Data Terminal Equipment and Data Circuit–Termination Equipment Employing Serial Binary Data Interchange”. Although the name may sound intimidating, the standard is simply concerned with serial data communication between a host system (Data Terminal Equipment, or “DTE”) and a peripheral system (Data Circuit–Terminating Equipment, or “DCE”). The EIA/TIA–232–E standard which was introduced in 1962 has been updated four times since its introduction in order to better meet the needs of serial communication applications. The letter “E” in the standard’s name indicates that this is the fifth revision of the standard.
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