![]() The official name of the standard is Electronic Industries Association/Telecommunications Industries Association EIA/TIA-232-F. Today, it is still widely used in embedded computer development systems, scientific instruments, and all sorts of industrial control equipment. The first personal computers included an RS-232 called a serial port for connection to a printer or other peripheral device. Over the years its use has included connections to video terminals, computers, and modems. It was originally established in 1962 as a method of connecting data terminal equipment (DTE) such as electromechanical teletypewriters to data communications equipment (DCE). One of the oldest serial interfaces is generically called RS-232. Any additional functions such as data handling is part of the media access control (MAC) layer or layer 2 of the OSI model. The definition of logic levels, medium, and connectors is part of the physical layer (PHY) or layer 1 of the Open Systems Interconnection (OSI) networking model. In some cases, they can perform serial-to-parallel and parallel-to-serial conversion or specify a basic data protocol. ![]() Serial interfaces can be used to provide standardized logic levels from transmitters to receivers, define the transmission medium and connectors, and specify timing and data rates.
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