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1、原文：SerialCommunicationviaRS232PortByHarshaPerlaandVeenaPai RS232isthemostknownserialportusedintransmittingthedataincommunicationandinterface.Eventhoughserialportishardertoprogramthantheparallelport,thisisthemosteffectivemethodinwhichthedatatransmissionrequireslesswiresthaty
2、ieldstothelesscost.TheRS232isthecommunicationlinewhichenablesthedatatransmissionbyonlyusingthreewirelinks.Thethreelinksprovides‘transmit’,‘receive’andcommonground... The‘transmit’and‘receive’lineonthisconnectersendandreceivedatabetweenthecomputers.Asthenameindicates,thedata
3、istransmittedserially.ThetwopinsareTXD&RXD.ThereareotherlinesonthisportasRTS,CTS,DSR,DTR,andRTS,RI.The‘1’and‘0’arethedatawhichdefinesavoltagelevelof3Vto25Vand-3Vto-25Vrespectively.TheelectricalcharacteristicsoftheserialportaspertheEIA(ElectronicsIndustryAssociation)RS232CSt
4、andardspecifiesamaximumbaudrateof20,000bps,whichisslowcomparedtotoday’sstandardspeed.Forthisreason,wehavechosenthenewRS-232DStandard,whichwasrecentlyreleased.TheRS-232Dhasexistedintwotypes.i.e.,D-TYPE25pinconnectorandD-TYPE9pinconnector,whicharemaleconnectorsonthebackoftheP
5、C.YouneedafemaleconnectoronyourcommunicationfromHosttoGuestcomputer.ThepinoutsofbothD-9&D-25areshowbelow.D-Type-9pinno.D-Type-25pinno.PinoutsFunction32RDReceiveData(Serialdatainput)23TDTransmitData(Serialdataoutput)74RTSRequesttosend(acknowledgetomodemthatUARTisreadytoexcha
6、ngedata85CTSCleartosend(i.e.;modemisreadytoexchangedata)66DSRDatareadystate(UARTestablishesalink)57SGSignalground18DCDDataCarrierdetect(Thislineisactivewhenmodemdetectsacarrier420DTRDataTerminalReady.922RIRingIndicator(BecomesactivewhenmodemdetectsringingsignalfromPSTNAbout
7、DTE & DCE: Devices,whichuseserialcablesfortheircommunication,aresplitintotwocategories.TheseareDCE(DataCommunicationsEquipment)andDTE(DataTerminalEquipment.)DataCommunicationsEquipmentsaredevicessuchasyourmodem,TAadapter,plotteretcwhileDataTerminalEquipmentisyourComputero
8、rTerminal.AtypicalDataTerminalDeviceisacomputerandatypicalDataCommunicationsDevice
