Interface RS-485 and RS-422

The RS-485 specification meets the requirements for a truly multipoint communications network, and the standard specifies up to 32 drivers and 32 receivers on a single (2-wire) bus. Some RS-485 transceivers modify the input impedance to allow up to 8× more nodes to be connected to the same bus. Analog Devices offers a wide range of standard RS-485/RS-422 transceivers and iCoupler® isolated RS-485/RS-422 transceivers to suit many applications.
Product Selection Table

Interface RS-485 and RS-422

Interface RS-485 and RS-422

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Interface RS-485 And RS-422

Part#Interface ProtocolData Rate (Max)Number-RxNumber-TxFull or Half Duplex OperationNumber of NodesDriver/Receiver EnableESD ProtectionFail SafeVsupply (min)Vsupply (max)
ADM489A RS-485 250 kbps 1 1 Full 32 Yes - Open, Short 4.5 5.5
ADM488A RS-485 250 kbps 1 1 Full 32 No - Open, Short 4.5 5.5
ADM1490E RS-485 16 Mbps 1 1 Full 32 No 8 kV Open, Short 4.75 5.25
ADM1491E RS-422, RS-485 16 Mbps 1 1 Full 32 Yes 8 kV Open 4.75 5.25
ADM487E RS-422, RS-485 250 kbps 1 1 Half 128 Yes 15 kV Open 4.75 5.25
ADM485E RS-422, RS-485 2.5 Mbps 1 1 Half 32 Yes 15 kV Open 4.75 5.25
ADM1487E RS-422, RS-485 2.5 Mbps 1 1 Half 128 Yes 15 kV Open 4.75 5.25
ADM3491E RS-422, RS-485 12 Mbps 1 1 Full 32 Yes 15 kV Open 3 3.6
ADM3490E RS-422, RS-485 12 Mbps 1 1 Full 32 No 15 kV Open 3 3.6
ADM3488E RS-422, RS-485 250 kbps 1 1 Full 32 No 15 kV Open 3 3.6
ADM3486E RS-422, RS-485 2.5 Mbps 1 1 Half 32 Yes 15 kV Open 3 3.6
ADM3483E RS-422, RS-485 250 kbps 1 1 Half 32 Yes 15 kV Open 3 3.6
ADM3078E RS-422, RS-485 16 Mbps 1 1 Half 256 Yes 15 kV Open, Short 3 3.6
ADM3077E RS-422, RS-485 16 Mbps 1 1 Full 256 No 15 kV Open, Short 3 3.6
ADM3076E RS-422, RS-485 16 Mbps 1 1 Full 256 Yes 15 kV Open, Short 3 3.6
ADM3075E RS-422, RS-485 500 kbps 1 1 Half 256 Yes 15 kV Open, Short 3 3.6
ADM3074E RS-422, RS-485 500 kbps 1 1 Full 256 No 15 kV Open, Short 3 3.6
ADM3073E RS-422, RS-485 500 kbps 1 1 Half 256 Yes 15 kV Open, Short 3 3.6
ADM3072E RS-422, RS-485 250 kbps 1 1 Half 256 Yes 15 kV Open, Short 3 3.6
ADM3071E RS-422, RS-485 250 kbps 1 1 Full 256 No 15 kV Open, Short 3 3.6
ADM3070E RS-422, RS-485 250 kbps 1 1 Full 256 Yes 15 kV Open, Short 3 3.6
ADM3493 RS-422, RS-485 250 kbps 1 1 Half 256 Yes - Open 3 3.6
ADM3490 RS-422, RS-485 10 Mbps 1 1 Full 32 No - Open 3 3.6
ADM3488 RS-422, RS-485 250 kbps 1 1 Full 32 No - Open 3 3.6
ADM3485 RS-422, RS-485 10 Mbps 1 1 Half 32 Yes - Open 3 3.6
ADM3483Reference Circuit Available RS-422, RS-485 250 kbps 1 1 Half 32 Yes - Open 3 3.6
ADM4857 RS-422, RS-485 10 Mbps 1 1 Full 256 No - Open, Short 4.75 5.25
ADM4856 RS-422, RS-485 2.5 Mbps 1 1 Full 256 No - Open, Short 4.75 5.25
ADM4855 RS-422, RS-485 500 kbps 1 1 Full 256 No - Open, Short 4.75 5.25
ADM4854 RS-422, RS-485 115 kbps 1 1 Full 256 No - Open, Short 4.75 5.25
ADM4853 RS-422, RS-485 10 Mbps 1 1 Half 256 Yes - Open, Short 4.75 5.25
ADM4852 RS-422, RS-485 2.5 Mbps 1 1 Half 256 Yes - Open, Short 4.75 5.25
ADM4851 RS-422, RS-485 500 kbps 1 1 Half 256 Yes - Open, Short 4.75 5.25
ADM4850 RS-422, RS-485 115 kbps 1 1 Half 256 Yes - Open, Short 4.75 5.25
ADM483 RS-422, RS-485 250 kbps 1 1 Half 32 Yes - Open 4.75 5.25
ADM1486 RS-422, RS-485 30 Mbps 1 1 Half 50 Yes - Open 4.75 5.25
ADM3485EReference Circuit Available RS-422, RS-485 12 Mbps 1 1 Half 50 Yes 15 kV Open 3 3.6
ADM3491 RS-422, RS-485 10 Mbps 1 1 Full 32 Yes - Open 3 3.6
ADM489 RS-422, RS-485 250 kbps 1 1 Full 32 Yes - Open 4.5 5.5
ADM488 RS-422, RS-485 250 kbps 1 1 Full 32 No - Open 4.5 5.5
ADM483E RS-422, RS-485 250 kbps 1 1 Half 32 Yes 15 kV Open 4.5 5.5
ADM485 RS-422, RS-485 5 Mbps 1 1 Half 32 Yes - Open 4.75 5.25
ADM1485 RS-422, RS-485 30 Mbps 1 1 Half 32 Yes - Open 4.75 5.25