EIA-423

(communications, standard)(Formerly "RS-423") An EIAserial line standard which specifies single endedcommunication. The mechanical connections for this interfaceare specified by EIA-449. Although it was originallyintented as a successor of EIA-232 it is not widely used.The EIA-232 standard has its limits at 20kbps and 1.5m.EIA-423 can have a cable lenght of 1200m, and achieve a datarate of 100Kbps. When no data is being transmitted, theserial line is at a logical zero (+3 to +15 Volts). A logicalone is represented as a signal level of -15 to -3 Volts. Inpractise, one often finds signals which switch betweennominally +4.5 and +0.5 Volts. Such signals are large bymodern standards, and because the impedance of the circuits isrelatively high, the allowable bit rate is modest. The datais preceded by a start bit which is always a logicalone. There may be seven or eight bits of data, possiblyfollowed by an even or odd parity bit and one or two stopbits. A "break" condition is a continuous logical one on theline which is what would be observed if nothing was connected.

Comparing EIA-422, 423, 449 to RS-232-C. Details on RS-232, 422, 423 and 485.

单词	eia-423
释义	EIA-423 EIA-423 (communications, standard)(Formerly "RS-423") An EIAserial line standard which specifies single endedcommunication. The mechanical connections for this interfaceare specified by EIA-449. Although it was originallyintented as a successor of EIA-232 it is not widely used.The EIA-232 standard has its limits at 20kbps and 1.5m.EIA-423 can have a cable lenght of 1200m, and achieve a datarate of 100Kbps. When no data is being transmitted, theserial line is at a logical zero (+3 to +15 Volts). A logicalone is represented as a signal level of -15 to -3 Volts. Inpractise, one often finds signals which switch betweennominally +4.5 and +0.5 Volts. Such signals are large bymodern standards, and because the impedance of the circuits isrelatively high, the allowable bit rate is modest. The datais preceded by a start bit which is always a logicalone. There may be seven or eight bits of data, possiblyfollowed by an even or odd parity bit and one or two stopbits. A "break" condition is a continuous logical one on theline which is what would be observed if nothing was connected. Comparing EIA-422, 423, 449 to RS-232-C. Details on RS-232, 422, 423 and 485.
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