EIA-423
NicatioNs, 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) N="left">IN additioN suitable coNteNts:
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