RS-485 / RS-422

以高数据速率或者进行长距离通信时,差分数据传输的表现优于大部分应用。差分信号有助于消除地偏移和感应噪声信号效应,其在网络内可表现为共模电压。RS-485规范符合真正多点通信网络的要求,根据该标准,单个(双线)总线上最多可以连接32个驱动器和32个接收器。部分RS-485收发器改变输入阻抗以允许多8倍的节点连接至同一总线。最常用的RS-485应用为工业环境下的可编程逻辑控制器间通信。其他常见用途有商店POS终端机和远程仪表。ADI公司提供各种不同的标准RS-485/RS-422收发器和iCoupler® 隔离式RS-485/RS-422收发器,以适应许多不同应用。

有用的新工具 -ADI RS-485/RS-422交叉选型指南

有关ADI公司接口和隔离产品的问题, 请访问中文技术论坛的接口与隔离支持社区。

Circuit from the lab 已完成设计、测试,可供立即集成

产品选型表

  • 安全和法规认证

  • iCoupler®系列数字隔离产品均经过安全测试(基本测试和强化测试),并通过多家监管机构认证。查看 合规性信息

  • RS-485 新闻

EngineerZone

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 RatingIntegrated isoPower
ADM4168E 10 Mbps - - Half - Yes 15 kV - 5 mA - 5 - -
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 -
ADM489A 250 kbps 1 1 Full 32 Yes - - 37 µA 4.5 5.5 - -
ADM488A 250 kbps 1 1 Full 32 No - - 37 µA 4.5 5.5 - -
ADM2587E 500 kbps 1 1 Full 256 Yes 15 kV Open, Short 125 mA 3 5.5 2.5 kV rms Yes
ADM2582E 16 Mbps 1 1 Full 256 Yes 15 kV Open, Short 230 mA 3 5.5 2.5 kV rms Yes
ADM1490E 16 Mbps 1 1 Full 32 No 8 kV Open 1.2 mA 4.75 5.25 - -
ADM1491E 16 Mbps 1 1 Full 32 Yes 8 kV Open 1.2 mA 4.75 5.25 - -
ADM2487E 500 kbps 1 1 Full 256 Yes 15 kV Open, Short 4 mA 3 5.5 2.5 kV rms -
ADM2484E 500 kbps 1 1 Full 256 Yes 15 kV Open, Short 2 mA 3 5.5 5 kV rms -
ADM2482E 16 Mbps 1 1 Full 256 Yes 15 kV Open, Short 6 mA 3 5.5 2.5 kV rms -
ADM2491E 16 Mbps 1 1 Full 32 Yes 8 kV Open - 3 5.5 5 kV rms -
ADM487E 250 kbps 1 1 Half 128 Yes 15 kV Open 400 µA 4.75 5.25 - -
ADM485E 2.5 Mbps 1 1 Half 32 Yes 15 kV Open 900 µA 4.75 5.25 - -
ADM2485Reference Circuit Available 16 Mbps 1 1 Half 50 Yes --- Open - 2.7 5.5 2.5 kV rms -
ADM1487E 2.5 Mbps 1 1 Half 128 Yes 15 kV Open 500 µA 4.75 5.25 - -
ADM3491E 12 Mbps 1 1 Full 32 Yes 15 kV Open 2.2 mA 3 3.6 - -
ADM3490E 12 Mbps 1 1 Full 32 No 15 kV Open 2.2 mA 3 3.6 - -
ADM3488E 250 kbps 1 1 Full 32 No 15 kV Open 2.2 mA 3 3.6 - -
ADM3486E 2.5 Mbps 1 1 Half 32 Yes 15 kV Open 2.2 mA 3 3.6 - -
ADM3483E 250 kbps 1 1 Half 32 Yes 15 kV Open 2.2 mA 3 3.6 - -
ADM3078E 16 Mbps 1 1 Half 256 Yes 15 kV Open, Short 1.5 mA 3 3.6 - -
ADM3077E 16 Mbps 1 1 Full 256 No 15 kV Open, Short 1.5 mA 3 3.6 - -
ADM3076E 16 Mbps 1 1 Full 256 Yes 15 kV Open, Short 1.5 mA 3 3.6 - -
ADM3075E 500 kbps 1 1 Half 256 Yes 15 kV Open, Short 1.5 mA 3 3.6 - -
ADM3074E 500 kbps 1 1 Full 256 No 15 kV Open, Short 1.5 mA 3 3.6 - -
ADM3073E 500 kbps 1 1 Half 256 Yes 15 kV Open, Short 1.5 mA 3 3.6 - -
ADM3072E 250 kbps 1 1 Half 256 Yes 15 kV Open, Short 1.5 mA 3 3.6 - -
ADM3071E 250 kbps 1 1 Full 256 No 15 kV Open, Short 1.5 mA 3 3.6 - -
ADM3070E 250 kbps 1 1 Full 256 Yes 15 kV Open, Short 1.5 mA 3 3.6 - -
ADM2490E 16 Mbps 1 1 Full 32 No 8 kV Open 4 mA 2.7 5.5 5 kV rms -
ADM3493 250 kbps 1 1 Half 256 Yes --- Open 2.2 mA 3 3.6 - -
ADM3490 10 Mbps 1 1 Full 32 No --- Open 2.2 mA 3 3.6 - -
ADM3488 250 kbps 1 1 Full 32 No --- Open 2.2 mA 3 3.6 - -
ADM3485 10 Mbps 1 1 Half 32 Yes --- Open 2.2 mA 3 3.6 - -
ADM3483Reference Circuit Available 250 kbps 1 1 Half 32 Yes --- Open 2.2 mA 3 3.6 - -
ADM4857 10 Mbps 1 1 Full 256 No --- Open, Short 500 µA 4.75 5.25 - -
ADM4856 2.5 Mbps 1 1 Full 256 No --- Open, Short 500 µA 4.75 5.25 - -
ADM4855 500 kbps 1 1 Full 256 No --- Open, Short 200 µA 4.75 5.25 - -
ADM4854 115 kbps 1 1 Full 256 No --- Open, Short 160 µA 4.75 5.25 - -
ADM4853 10 Mbps 1 1 Half 256 Yes --- Open, Short 500 µA 4.75 5.25 - -
ADM4852 2.5 Mbps 1 1 Half 256 Yes --- Open, Short 500 µA 4.75 5.25 - -
ADM4851 500 kbps 1 1 Half 256 Yes --- Open, Short 200 µA 4.75 5.25 - -
ADM4850 115 kbps 1 1 Half 256 Yes --- Open, Short 160 µA 4.75 5.25 - -
ADM483 250 kbps 1 1 Half 32 Yes --- Open 650 µA 4.75 5.25 - -
ADM2483 500 kbps 1 1 Half 256 Yes --- Open, Short 2.5 mA 2.7 5.5 2.5 kV rms -
ADM2486 20 Mbps 1 1 Half 50 Yes --- Open 3 mA 2.7 5.5 2.5 kV rms -
ADM1486 30 Mbps 1 1 Half 50 Yes --- Open 2 mA 4.75 5.25 - -
ADM3485EReference Circuit Available 12 Mbps 1 1 Half 32 Yes 15 kV Open 2.2 mA 3 3.6 - -
ADM3491 10 Mbps 1 1 Full 32 Yes --- Open 1 µA 3 3.6 - -
ADM489 250 kbps 1 1 Full 32 Yes --- Open 74 µA 4.5 5.5 - -
ADM488 250 kbps 1 1 Full 32 No --- Open 74 µA 4.5 5.5 - -
ADM483E 250 kbps 1 1 Half 32 Yes 15 kV Open 10 µA 4.5 5.5 - -
ADM485 5 Mbps 1 1 Half 32 Yes --- Open 2.2 mA 4.75 5.25 - -
ADM1485 30 Mbps 1 1 Half 32 Yes --- Open 2.2 mA 4.75 5.25 - -
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Interface RS-485

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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