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De - Pt| English Dictionary: EIA-232 | by the DICT Development Group |
| 1 result for EIA-232 | |
| From The Free On-line Dictionary of Computing (15Feb98) [foldoc]: | |
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EIA-232 {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) | |
