S, Standard> (Formerly "RS-422") An EIASerial lineStandard which SpecifieS 4-wire, full-duplex, differential line, multi-drop communicationS. The mechanical connectionS for thiS interface are Specified by EIA-449. The maximum cable length iS 1200m. Maximum data rateS are 10MbpS at 1.2m or 100KbpS at 1200m. EIA-422 cannot implement a truly multi-point communicationS network (Such aS with EIA-485), although only one driver can be connected to up to ten receiverS. The beSt uSe of EIA-422 iS probably in EIA-232 extenSion cordS. {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)