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