EIA-232 - definition. What is EIA-232
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STANDARD FOR SERIAL COMMUNICATION
Rs232c; RS-232C; RS232; EIA-232; V.24; RS 232; EIA/TIA-232; EIA--232; Rs232; Ring Indicator; Ring indicator; Data Set Ready; TIA-574; EIA/TIA-574; RS-232 RTS/CTS; Data set ready; Rs-232; Eia Rs-232C; RS-232 devices; Rs 232; EIA232; RS232c; RS232C; Rs232C; Rs-232C; RS-232c; Rs-232c; TIA-232; ANSI EIA/TIA-232; ANSI TIA-232; RS-232-C; TIA-232-F; EIA-232-D; RS-232-A; EIA RS-232-A; EIA RS-232-B; RS-232-B; EIA RS-232-C; EIA EIA-232-D; EIA RS-232; TIA/EIA-232-E; ANSI/TIA-232-F-1997 (R2002); ANSI/TIA-232-F-1997; TIA/EIA-232-F; TIA-232-E:1991; TIA-232-E; Interface Between Data Terminal Equipment and Data Circuit-Terminating Equipment Employing Serial Binary Data Interchange; Interface between data terminal equipment and data circuit-terminating equipment employing serial binary data interchange; TIA TIA-232-F; EIA/TIA-232-F:1997-10; TIA EIA/TIA-232-F:1997-10; EIA/TIA-232-F; TIA EIA/TIA-232-F; TIA TIA-232-F-1997 (R2012); TIA-232-F-1997 (R2012); RS-232 flow-control; RS-232 flow control; ITU-T V.24; ITU-T/CCITT V.24; CCITT V.24
  • Male pinout of a 9-pin (D-subminiature, DE-9) serial port commonly found on 1990's computers
  • Male pinout of a 25-pin serial port (D-subminiature, DB-25) commonly found on 1980's computers
  • A [[DB-25]] connector as described in the RS-232 standard
  • [[USRobotics]] Courier external modem had a [[DB-25]] connector that used the Ring Indicator signal to notify the host computer when the connected [[telephone line]] was ringing
  • [[Data circuit-terminating equipment]] (DCE) and [[data terminal equipment]] (DTE) network.
  • [[PCI Express]] x1 card with one RS-232 port on a nine-pin connector

EIA-232         
<communications, standard> (Formerly "RS-232") The most common asynchronous serial line standard. EIA-232 is the EIA equivalent of ITU-T V.24, and V.28. EIA-232 specifies the gender and pin use of connectors, but not their physical type. RS-423 specifies the electrical signals. 25-way D-type connectors are common but often only three wires are connected - one ground (pin 7) and one for data in each direction. The other pins are primarily related to hardware handshaking between sender and receiver and to carrier detection on modems, inoperative circuits, busy conditions etc. The standard classifies equipment as either {Data Communications Equipment} (DCE) or Data Terminal Equipment (DTE). DTE receives data on pin 3 and transmits on pin 2 (TD). A DCE EIA-232 interface has a female connector. DCE receives data from DTE on pin 2 (TD) and sends that data out the analog line. Data received from the analog line is sent by the DCE on pin 3(RD). Originally DCE was a modem and DTE was a computer or terminal. The terminal or computer was connected (via EIA-232) to two modems, which were connected via a telephone line. The above arrangement allows a computer or terminal to be connected to a modem with a straight-through (2-2, 3-3) cable. It is common, however, to find equipment with the wrong sex connector or with pins two and three reversed, requiring the insertion of a cable or adaptor wired as a gender mender or null modem. Such an adaptor is also required when connecting a computer directly to a terminal or to another computer without the use of modems. (1999-12-28)
RS-232         
RS-232         
In telecommunications, RS-232 or Recommended Standard 232 is a standard originally introduced in 1960 for serial communication transmission of data. It formally defines signals connecting between a DTE (data terminal equipment) such as a computer terminal, and a DCE (data circuit-terminating equipment or data communication equipment), such as a modem.

ويكيبيديا

RS-232

In telecommunications, RS-232 or Recommended Standard 232 is a standard originally introduced in 1960 for serial communication transmission of data. It formally defines signals connecting between a DTE (data terminal equipment) such as a computer terminal, and a DCE (data circuit-terminating equipment or data communication equipment), such as a modem. The standard defines the electrical characteristics and timing of signals, the meaning of signals, and the physical size and pinout 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. The RS-232 standard had been commonly used in computer serial ports and is still widely used in industrial communication devices.

A serial port complying with the RS-232 standard was once a standard feature of many types of computers. Personal computers used them for connections not only to modems, but also to printers, computer mice, data storage, uninterruptible power supplies, and other peripheral devices.

Compared with later interfaces such as RS-422, RS-485 and Ethernet, RS-232 has lower transmission speed, shorter maximum cable length, larger voltage swing, larger standard connectors, no multipoint capability and limited multidrop capability. In modern personal computers, USB has displaced RS-232 from most of its peripheral interface roles. Thanks to their simplicity and past ubiquity, however, RS-232 interfaces are still used—particularly in industrial machines, networking equipment, and scientific instruments where a short-range, point-to-point, low-speed wired data connection is fully adequate.