RS-422 (TIA/EIA-422) e na le lebelo le holimo, ho hanyetsa lerata ho betere le bolelele ba cable e telele ho feta maemo a khale a RS-232C.
Sistimi ea RS-422 e ka fetisa data ka litefiso ho fihla ho 10 Mbit / s mme e ka fetisetsa data ho fihla ho limithara tse 1,200 (maoto a 3,900).RS-422 e ne e sebelisoa haholo lik'homphieutha tsa Macintosh tsa pele.E kenngwa tshebetsong ka sehokelo sa diphini tse ngata ho disebediswa tsa RS-232 tse kang modem, AppleTalk network, RS-422 printers, le peripherals tse ling.