EIA-232

(communications, standard)(Formerly "RS-232") The most commonasynchronous serial line standard. EIA-232 is the EIAequivalent of ITU-T V.24, and V.28.

EIA-232 specifies the gender and pin use of connectors, butnot their physical type. RS-423 specifies the electricalsignals. 25-way D-type connectors are common but often onlythree wires are connected - one ground (pin 7) and one fordata in each direction. The other pins are primarily relatedto hardware handshaking between sender and receiver and tocarrier detection on modems, inoperative circuits, busyconditions 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. DCEreceives data from DTE on pin 2 (TD) and sends that data outthe analog line. Data received from the analog line is sentby 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 twomodems, which were connected via a telephone line.

The above arrangement allows a computer or terminal to beconnected to a modem with a straight-through (2-2, 3-3) cable.It is common, however, to find equipment with the wrong sexconnector or with pins two and three reversed, requiring theinsertion of a cable or adaptor wired as a gender mender ornull modem. Such an adaptor is also required whenconnecting a computer directly to a terminal or to anothercomputer without the use of modems.

单词	eia-232
释义	EIA-232 EIA-232 (communications, standard)(Formerly "RS-232") The most commonasynchronous serial line standard. EIA-232 is the EIAequivalent of ITU-T V.24, and V.28. EIA-232 specifies the gender and pin use of connectors, butnot their physical type. RS-423 specifies the electricalsignals. 25-way D-type connectors are common but often onlythree wires are connected - one ground (pin 7) and one fordata in each direction. The other pins are primarily relatedto hardware handshaking between sender and receiver and tocarrier detection on modems, inoperative circuits, busyconditions 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. DCEreceives data from DTE on pin 2 (TD) and sends that data outthe analog line. Data received from the analog line is sentby 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 twomodems, which were connected via a telephone line. The above arrangement allows a computer or terminal to beconnected to a modem with a straight-through (2-2, 3-3) cable.It is common, however, to find equipment with the wrong sexconnector or with pins two and three reversed, requiring theinsertion of a cable or adaptor wired as a gender mender ornull modem. Such an adaptor is also required whenconnecting a computer directly to a terminal or to anothercomputer without the use of modems.
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