RS-485/RS-422

When communicating at high data rates, or over long distances differential data transmission offers superior performance in most applications. Differential signals can help nullify the effects of ground shifts and induced noise signals that can appear as common mode voltages on a network. The RS-485 specification meets the requirements for a truly multi-point 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-times more nodes to be connected to the same bus. The most common RS-485 application is inter-programmable logic controller communication in industrial environments. Other common uses are point of sale terminals in stores and remote meters. 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.

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Isolated RS-485

Part#Data Rate RS-485Number-RxNumber-TxFull or Half DuplexNumber of Nodes On BusDriver/Receiver EnableESD Protection VoltageFail SafeIsupply (max)Vsupply Positive (min)Vsupply Positive (max)Insulation RatingOperating Temp RangeIntegrated isoPower
ADM2687E 500 kbps 1 1 Full 256 Yes 15 kV Open, Short - 3.3 5 5 kV rms - Yes
ADM2682E 16 Mbps 1 1 Full 256 Yes 15 kV Open, Short - 3.3 5 5 kV rms - Yes
ADM2481 500 kbps 1 1 Half 256 Yes --- Open, Short - 3 5.5 2.5 kV rms -40 to +85 -
ADM2587E 500 kbps 1 1 Full 256 Yes 15 kV Open, Short 125 mA 3 5.5 2.5 kV rms -40 to +85 Yes
ADM2582E 16 Mbps 1 1 Full 256 Yes 15 kV Open, Short 230 mA 3 5.5 2.5 kV rms -40 to +85 Yes
ADM2487E 500 kbps 1 1 Full 256 Yes 15 kV Open, Short 4 mA 3 5.5 2.5 kV rms -40 to +85 -
ADM2484E 500 kbps 1 1 Full 256 Yes 15 kV Open, Short 2 mA 3 5.5 5 kV rms -40 to +85 -
ADM2482E 16 Mbps 1 1 Full 256 Yes 15 kV Open, Short 6 mA 3 5.5 2.5 kV rms -40 to +85 -
ADM2491E 16 Mbps 1 1 Full 32 Yes 8 kV Open - 3 5.5 5 kV rms -40 to +85 -
ADM2485Reference Circuit Available 16 Mbps 1 1 Half 50 Yes --- Open - 2.7 5.5 2.5 kV rms -40 to +85 -
ADM2490E 16 Mbps 1 1 Full 32 No 8 kV Open 4 mA 2.7 5.5 5 kV rms -40 to +105 -
ADM2483 500 kbps 1 1 Half 256 Yes --- Open, Short 2.5 mA 2.7 5.5 2.5 kV rms -40 to +85 -
ADM2486 20 Mbps 1 1 Half 50 Yes --- Open 3 mA 2.7 5.5 2.5 kV rms -40 to +85 -
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Interface RS-485 And RS-422

Part#Interface ProtocolsData Rate RS-485Data Rate RS-422Number-RxNumber-TxFull or Half DuplexNumber of Nodes On BusDriver/Receiver EnableESD Protection VoltageFail SafeIsupply (max)Vsupply Positive (min)Vsupply Positive (max)
ADM4168E RS-485 10 Mbps 10 Mbps - - Half - Yes 15 kV - 5 mA - 5
ADM2687E RS-485 500 kbps - 1 1 Full 256 Yes 15 kV Open, Short - 3.3 5
ADM2682E RS-485 16 Mbps 16 Mbps 1 1 Full 256 Yes 15 kV Open, Short - 3.3 5
ADM2481 RS-422 500 kbps 500 kbps 1 1 Half 256 Yes --- Open, Short - 3 5.5
ADM489A RS-485 250 kbps 250 kbps 1 1 Full 32 Yes - - 37 µA 4.5 5.5
ADM488A RS-485 250 kbps 250 kbps 1 1 Full 32 No - - 37 µA 4.5 5.5
ADM2587E RS-422 500 kbps 500 kbps 1 1 Full 256 Yes 15 kV Open, Short 125 mA 3 5.5
ADM2582E RS-422 16 Mbps 16 Mbps 1 1 Full 256 Yes 15 kV Open, Short 230 mA 3 5.5
ADM1490E RS-485 16 Mbps 16 Mbps 1 1 Full 32 No 8 kV Open 1.2 mA 4.75 5.25
ADM1491E RS-422 16 Mbps 16 Mbps 1 1 Full 32 Yes 8 kV Open 1.2 mA 4.75 5.25
ADM2487E RS-422 500 kbps 500 kbps 1 1 Full 256 Yes 15 kV Open, Short 4 mA 3 5.5
ADM2484E RS-422 500 kbps 500 kbps 1 1 Full 256 Yes 15 kV Open, Short 2 mA 3 5.5
ADM2482E RS-422 16 Mbps 16 Mbps 1 1 Full 256 Yes 15 kV Open, Short 6 mA 3 5.5
ADM2491E RS-422 16 Mbps 16 Mbps 1 1 Full 32 Yes 8 kV Open - 3 5.5
ADM487E RS-422 250 kbps 250 kbps 1 1 Half 128 Yes 15 kV Open 400 µA 4.75 5.25
ADM485E RS-422 2.5 Mbps 2.5 Mbps 1 1 Half 32 Yes 15 kV Open 900 µA 4.75 5.25
ADM2485Reference Circuit Available RS-422 16 Mbps 16 Mbps 1 1 Half 50 Yes --- Open - 2.7 5.5
ADM1487E RS-422 2.5 Mbps 2.5 Mbps 1 1 Half 128 Yes 15 kV Open 500 µA 4.75 5.25
ADM3491E RS-422 12 Mbps 12 Mbps 1 1 Full 32 Yes 15 kV Open 2.2 mA 3 3.6
ADM3490E RS-422 12 Mbps 12 Mbps 1 1 Full 32 No 15 kV Open 2.2 mA 3 3.6
ADM3488E RS-422 250 kbps 250 kbps 1 1 Full 32 No 15 kV Open 2.2 mA 3 3.6
ADM3486E RS-422 2.5 Mbps 2.5 Mbps 1 1 Half 32 Yes 15 kV Open 2.2 mA 3 3.6
ADM3483E RS-422 250 kbps 250 kbps 1 1 Half 32 Yes 15 kV Open 2.2 mA 3 3.6
ADM3078E RS-422 16 Mbps 16 Mbps 1 1 Half 256 Yes 15 kV Open, Short 1.5 mA 3 3.6
ADM3077E RS-422 16 Mbps 16 Mbps 1 1 Full 256 No 15 kV Open, Short 1.5 mA 3 3.6
ADM3076E RS-422 16 Mbps 16 Mbps 1 1 Full 256 Yes 15 kV Open, Short 1.5 mA 3 3.6
ADM3075E RS-422 500 kbps 500 kbps 1 1 Half 256 Yes 15 kV Open, Short 1.5 mA 3 3.6
ADM3074E RS-422 500 kbps 500 kbps 1 1 Full 256 No 15 kV Open, Short 1.5 mA 3 3.6
ADM3073E RS-422 500 kbps 500 kbps 1 1 Half 256 Yes 15 kV Open, Short 1.5 mA 3 3.6
ADM3072E RS-422 250 kbps 250 kbps 1 1 Half 256 Yes 15 kV Open, Short 1.5 mA 3 3.6
ADM3071E RS-422 250 kbps 250 kbps 1 1 Full 256 No 15 kV Open, Short 1.5 mA 3 3.6
ADM3070E RS-422 250 kbps 250 kbps 1 1 Full 256 Yes 15 kV Open, Short 1.5 mA 3 3.6
ADM2490E RS-422 16 Mbps 16 Mbps 1 1 Full 32 No 8 kV Open 4 mA 2.7 5.5
ADM3493 RS-422 250 kbps 250 kbps 1 1 Half 256 Yes --- Open 2.2 mA 3 3.6
ADM3490 RS-422 10 Mbps 10 Mbps 1 1 Full 32 No --- Open 2.2 mA 3 3.6
ADM3488 RS-422 250 kbps 250 kbps 1 1 Full 32 No --- Open 2.2 mA 3 3.6
ADM3485 RS-422 10 Mbps 10 Mbps 1 1 Half 32 Yes --- Open 2.2 mA 3 3.6
ADM3483Reference Circuit Available RS-422 250 kbps 250 kbps 1 1 Half 32 Yes --- Open 2.2 mA 3 3.6
ADM4857 RS-422 10 Mbps 10 Mbps 1 1 Full 256 No --- Open, Short 500 µA 4.75 5.25
ADM4856 RS-422 2.5 Mbps 2.5 Mbps 1 1 Full 256 No --- Open, Short 500 µA 4.75 5.25
ADM4855 RS-422 500 kbps 500 kbps 1 1 Full 256 No --- Open, Short 200 µA 4.75 5.25
ADM4854 RS-422 115 kbps 115 kbps 1 1 Full 256 No --- Open, Short 160 µA 4.75 5.25
ADM4853 RS-422 10 Mbps 10 Mbps 1 1 Half 256 Yes --- Open, Short 500 µA 4.75 5.25
ADM4852 RS-422 2.5 Mbps 2.5 Mbps 1 1 Half 256 Yes --- Open, Short 500 µA 4.75 5.25
ADM4851 RS-422 500 kbps 500 kbps 1 1 Half 256 Yes --- Open, Short 200 µA 4.75 5.25
ADM4850 RS-422 115 kbps 115 kbps 1 1 Half 256 Yes --- Open, Short 160 µA 4.75 5.25
ADM483 RS-422 250 kbps 250 kbps 1 1 Half 32 Yes --- Open 650 µA 4.75 5.25
ADM2483 RS-422 500 kbps - 1 1 Half 256 Yes --- Open, Short 2.5 mA 2.7 5.5
ADM2486 RS-422 20 Mbps - 1 1 Half 50 Yes --- Open 3 mA 2.7 5.5
ADM1486 RS-422 30 Mbps 30 Mbps 1 1 Half 50 Yes --- Open 2 mA 4.75 5.25
ADM3485EReference Circuit Available RS-422 12 Mbps 12 Mbps 1 1 Half 32 Yes 15 kV Open 2.2 mA 3 3.6
ADM3491 RS-422 10 Mbps 10 Mbps 1 1 Full 32 Yes --- Open 1 µA 3 3.6
ADM489 RS-422 250 kbps 250 kbps 1 1 Full 32 Yes --- Open 74 µA 4.5 5.5
ADM488 RS-422 250 kbps 250 kbps 1 1 Full 32 No --- Open 74 µA 4.5 5.5
ADM483E RS-422 250 kbps 250 kbps 1 1 Half 32 Yes 15 kV Open 10 µA 4.5 5.5
ADM485 RS-422 5 Mbps 5 Mbps 1 1 Half 32 Yes --- Open 2.2 mA 4.75 5.25
ADM1485 RS-422 30 Mbps 30 Mbps 1 1 Half 32 Yes --- Open 2.2 mA 4.75 5.25
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