... duplex RS422 interfaces 4, communication line is the unshielded twisted-pair cabling of which the sectional area is ... K is in the location "485", the four-wire half-duplex RS485 interfaces D + and D- are ... switch K is in the location 422, the four-wire full-duplex RS422 interfaces RXD +, RXD-, TXD + ... (115.2 Kbps).When the length of communication wire is over 50 meters, one terminal resistance of ...