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  • RS-232
  • 23-05-2012


In telecommunications, RS-232 is the traditional name for a series of standards for serial binary single

-ended data and control signals connecting between a DTE (Data Terminal Equipment) and a DCE

(Data Circuit-terminating Equipment). It is commonly used in computer serial ports. The standard

defines the electrical characteristics and timing of signals, the meaning of signals, and the physical size

and pin out of connectors. The current version of the standard is TIA-232-F Interface Between Data

Terminal Equipment and Data Circuit-Terminating Equipment Employing Serial Binary Data

Interchange, issued in 1997.

An RS-232 port was once a standard feature of a personal computer for connections to modems,

printers, mice, data storage, un-interruptible power supplies, and other peripheral devices. However,

the limited transmission speed, relatively large voltage swing, and large standard connectors motivated

development of the universal serial bus which has displaced RS-232 from most of its peripheral

interface roles. Many modern personal computers have no RS-232 ports and must use an external

converter to connect to older peripherals. Some RS-232 devices are still found especially in industrial

machines or scientific instruments.

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