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信息自动化专业外文翻译.doc外文资料原文TransmittingandreceivingserialdataTheUniversalAsynchronousReceiver/Transmitter(UART),asecondUARTre-(bits)・,-232,RS-422andRS-,thepresenceorabsenceofcurrent(incurrentloops),IrDA(infrared),and(wireless)BluetoothinitsSerialPortProfile(SPP).Somesignalingschemesusemodulationofacarriersignal(withorwithoutwires).Examplesarcmodulationofaudiosignalswithphonelinemodems,RFmodulationwithdataradios,andtheDC-municationmaybenfullduplex"(bothsendandreceiveatthesametime)orHhalfduplex11(devicestaketurnstransmittingandreceiving).Asof2008,monlyusedwithRS-munications-,andlow-costchipsexisttoconvertlogiclevelsignals(suchasTTLvoltages)toRS-232levelsignals(forexample,Maxim'sMAX232)・错误!超链接引用无效。AsynchronousreceiveandtransmitInasynchronoustransmitting,teletype-styleUARTssenda"start”bit,fivetoeightdatabits,least-significant-bitfirst,anoptional"parity”bit,andthenone,oneandahalf,ortwo"stop”-line!-line'sidlestate,andprovidesadelaybeforethenextcharactercanstart.(Thisiscalledasynchron

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