TI RS-485 for E-Meter Applications

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1、ApplicationReportSLLA112A–August2004RS-485forE-MeterApplicationsClarkKinnairdHighPerformanceLinearProductsABSTRACTThisapplicationreportdiscussesthebestpracticesfordesigningenergymetercommunicationcircuitsusingtheRS-485standard.Componentselectionandperformancetra

2、deoffsarecoveredwithreferencetorelevantstandardssuchasIEC61036andDL/T645.Referencedesigndetailsareprovidedtohelpenergymeterengineerssuccessfullycompletetheirowncircuitdesigns.ContentsIntroduction...................................................................

3、..........................................................................1RS-485Interface......................................................................................................................................2BalancedSignaling....................

4、.......................................................................................................3SignalLevelsandBusLoading.........................................................................................................3BusLength..................

5、......................................................................................................................4InterfaceIsolation.............................................................................................................................

6、.4FailsafeBiasing.................................................................................................................................7TransientVoltageProtection.........................................................................................

7、....................9ESDProtection......................................................................................................................................10TransceiverSelection........................................................................

8、...................................................10AdditionalReferences.............................................................................................