B&B Electronics 485SD9R PDF bfb33f9b
BampBELECTRONICSPRODUCTINFORMATIONP9146_485SD9R081212Model485SD9RPortPoweredRS485ConverterCEThe485SD9RisaportpoweredtwochannelRS232toRS485converterItconvertsTDandRDRS232linestobalancedhalfduplexRS485signalsTheunitispoweredfromtheRS232dataandhandshakelineswhetherthelinesarehighorlowThe485SD9RhasDB9femaleconnectorsonboththeRS232sideandtheRS485sideRS232SideConnectorDB9femaleSignalsPassesthroughpins3TDand2RDPins7RTSand8CTSaretiedtogetherPins4DTR6DSRand1CDaretiedtogetherRS485SideConnectorDB9femaleSignals2wirehalfduplexoperationonlyAutomaticcontrolcircuitenablesdriveronlywhentransmittingReceiverisdisabledwhentransmittingtopreventechobacktoRS232deviceDataRatesUpto1152kbaudDistanceDependingonpowerfromportwilltransmitupto4000feetat19200baudDimensions250x130x80inPowerRequirementsNoexternalpowerisrequirediftwoRS232outputhandshakelinesareavailableIfthehandshakelinesareraisedandnoterminationisusedthepowerefficiencyisgreatlyincreasedLessthan3mAisrequiredtooperatethe485SD9RplustheloadcurrentNOTEConnectinganexternalpowersupplytothehandshakelinesmaydamagetheunitContacttechnicalsupportformoreinformationonconnectinganexternalpowersupplytothehandshakelinesOperationAlthoughthe485SD9RuseshandshakelinestopowertheconverternohandshakingisrequiredtocontroltheRS485driverTheRS485driverisautomaticallyenabledduringeachspacingstateontheRS232sideDuringthemarkingoridlestatetheRS485driverisdisabledandthedatalinesareheldinthemarkingstatebythe47KohmpullupandpulldownresistorsThevalueoftheseresistorsmayneedtobechangedtoadifferentvaluewhenterminationisusedinordertomaintaintheproperDCbiasduringtheidlestateSeeBampBElectronicsfreeRS422RS485ApplicationNoteformoreinformationonterminationandDCbiasingofanRS485networkSomeusersmayseeanechoedcharacterstringontheirRS232sideThisisduetothelowpoweroperationoftheDS1275chipTheDS1275usesthelesservalueofgroundornegativeinputvoltageintothereceiverforthedriversnegativerailWhentransmittingintothisdeviceitsRS232outputmayswingbetweenthenegativeinputandgroundasthereceiverinputvoltagegoesnegativeandpositiveThereforeifyourreceiverinterpretsgroundasaspaceorhighlevelyoumayseeanechoedcharacterstringontheRS232sideIfthisisnotacceptableforyourapplicationyoumaywanttochooseoneofourexternallypoweredunitssimilartothe485PTBR4695D9K2wireRS4852oroDATAADATA2Or7DATA
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