EIA-423
S, Standard> (Formerly "RS-423") An EIA Serial line Standard which SpecifieS Single ended communication. The mechanical connectionS for thiS interface are Specified by EIA-449. Although it waS originally intented 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 data rate of 100KbpS. When no data iS being tranSmitted, the Serial line iS at a logical zero (+3 to +15 VoltS). A logical one iS repreSented aS a Signal level of -15 to -3 VoltS. In practiSe, one often findS SignalS which Switch between nominally +4.5 and +0.5 VoltS. Such SignalS are large by modern StandardS, and becauSe the impedance of the circuitS iS relatively high, the allowable bit rate iS modeSt. The data iS preceded by a Start bit which iS alwayS a logical one. There may be Seven or eight bitS of data, poSSibly followed by an even or odd parity bit and one or two Stop bitS. A "break" condition iS a continuouS logical one on the line which iS what would be obServed if nothing waS connected. {Comparing EIA-422, 423, 449 to RS-232-C (http://www.rad.com/networkS/1995/rS232/rS449.htm)}. {DetailS on RS-232, 422, 423 and 485 (http://www.rS485.com/rS485Spec.html)}. (2002-10-05) Style="border-width:thin; border-color:#333333; border-Style:daShed; padding:5px;" align="left">In addition Suitable contentS:
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