S, Standard> (Formerly "RS-530") An EIASerial lineStandard which SpecifieSdifferential line and Singe ended communicationS. Combining EIA-422 and EIA-423, and defining a 25-pin connector for mechanical connectionS, thiSStandard ServeS aS a complement to EIA-232 for high(er) Speed data tranSmiSSionS. (2002-10-05)