基于串口通信的字符终端的设计-外文翻译

本科毕业设计英文翻译专业名称电子信息工程学生姓名******指导教师*****完成时间2013.06本科毕业设计英文翻译指导教师评阅意见学生姓名：******班级：122902得分：请指导教师用红笔在译文中直接进行批改，并就以下几方面填写评阅意见，给出综合得分（满分按15分计）。1、专业术语、词汇翻译的准确性；2、翻译材料是否与原文的内容一致；3、翻译材料字数是否符合要求；4、语句是否通顺，是否符合中文表达习惯。指导教师（签名）：年月日SerialCommunicationBasedCharacterDisplayTerminalTointroduceWithmicrocontrollerandmicroprocessortechnologycontinuestoevolve,especiallyinthefieldofnetworktechnologywidelyusedinthemonitoringandcontrolbythePCandmulti-singlechipconsistingofmulti-machinenetworkmonitoringandcontrolsystemhasbecometheSCMtechnologydevelopmentinonedirection.Computerandcomputerorcomputerdatatransferbetweentheterminalcanuseaserialcommunicationsandparallelcommunicationsintwoways.Sincetheserialcommunicationlinewiththeuseofsmall,lowcost,especiallyinthelong-distancetransmission,thenumberoflinescharacteristicavoidsinconsistencieswhicharewidelyused.Inserialcommunications,requirecommunicatingpartieshaveadoptedastandardinterfacethatallowsdifferentdevicescanbeeasilyconnectedtogetherforcommunication.RS-232-Cinterfaces(alsoknownasEIARS-232-C)isthemostcommonlyusedasaserialcommunicationinterface.Itwasin1970bytheAmericanElectronicsIndustryAssociation(EIA)jointBellSystem,modemmanufacturersandcomputerterminalmanufacturersjointlydevelopedastandardforserialcommunications.Itsfullnameisdataterminalequipment(DTE)anddatacommunicationsequipment(DCE)serialbinarydataexchangeinterfacebetweentechnicalstandards,Thisstandardrequirestheuseofa25footDB25connector,theconnectorofeachprimerpinsignalcontenttobeprovided,butalsoonthelevelofavarietyofsignalstobeprovided.Acombinationofsingle-chipserialcommunicationinreal-timedataacquisitionandcomputergraphicsprocessing,displayadvantages.Meanwhile,windowsenvironmentbackgroundindatabasemanagementcomputerhasobviousadvantages.MakestheapplicationofSCMisnotlimitedtotraditionalautomaticmonitoringorcontrol,andtheformationofthecoreofthenetwork-distributedmulti-pointsystemtrends.ThispaperdescribesthePC-51seriesMCUcommunicationwiththegeneralmethodandabriefextension.MicrocontrollerhardwarestructureandcommunicationsystemMicrocontrollerandPCserialcommunicationgenerallyuseRS-232,RS-422,orB3-485busstandardinterface,thereisalsoanon-standard20nnJLcurrentloop.Toensurereliablecommunications,thechoiceofinterfacemustbenoted:(1)therateofcommunication;(2)Communicationdistance:(3)anti-jammingcapability;(4)networking.ThispaperdescribestheuseofRS-232interfacetocommunicatewiththemicrocontrollermethod.1,RS-232levelconverterandPCinterfacecircuitRS-232isanearlydatacommunicationtothepublictelephonenetworkandestablishedstandards,thelogiclevelandITL\CMOSpoweralmostentirelydifferent.Logic0isdefinedas+5-+15Vbetweenlogic1,definedasbetween-5~-15VSinceRS-232transmitandreceivebetweencommongroundtransmissionusingnon-equilibriummodel,soatotalofmodenoiseiscoupledtothesignalsystem,thestandardrecommendedmaximumcommunicationdistanceof15meters,butthepracticalapplicationofour300bi:/sratecanreach300meters.RS-232levelandthegeneralprovisionsofthemicroprocessorlogiclevelinconsistent,mustbelevelconversion,logic-leveltranslatorscanusethefollowingthreeways.TheconversioninterfaceusingMAX232MAX232chipisproducedbyMAXIM,includingtwo-waydriverandreceiverRS-232converterchip.Figure2isapracticalcircuit.Chiphasaninternalvoltageconverter,youcanconverttheinputvoltageis+5vRS-232interface±10Vvoltagerequired,especiallyforno±12Vsinglesupplysystem.Withthisprinciple,thesamechipaswellMAx202,AD'sADDtl01andINl2onlySIL'sICl232chips.ImplementedusingdiscretecomponentsFigure3showstheconversioninterfaceimplementedusingdiscretecomponentsRS-232-TTLlevelconversioninterfacecircuit,whichischaracterizedbytheuseofPC-BS-232interfacesignal③feetout(alsoavailable④,⑦feet)tosupplythenegativesupply,FCmachine③,④,⑦feetinthenon-transmissionlogic0levelareonelevel(-10Vorso),thedrivecapacityof20mA,usingthischaracteristic,withadiodeandanelectrolyticcapacitors,electrolyticcapacitorthatisacquiredontheRS-232communicationsrequirednegativesupply.Thecircuitissimple,lowpowerconsumption,intheabsenceofadedicatedchipwhenregardedasaworkaround.TheintroductionoftheRS.232toTTLlevelconversionmethodcanbeappliedtomostofthecommunicationsystem,insomespecialapplicationssuchaselectrostaticprotectionneeds,multi-transceiver(egwithMODEMconnected)canbeusedwhenMAX238(4drive,fourreceiving)orMAX3221tt15Kvelectrostaticprotection)andotherchips.2,single-chipserialcommunicationdesignSCMstringworksthewidelyused51seriesmicrocontrollerserialcommunicationcanoperateinsynchronousorasynchronousmode,mostcompatiblewiththe8051serieshasoneormoreUARTasynchronousserialinterface,whichisdesignedforuserscommunicationprogramprovidesgoodfacilities.Whentheapplicationsystemrequiresmultipleserialcommunicationinterface,wecanusethefollowingmethods:(a)multi-chipserialport,suchasWinbondWW77E58therearetwoserialinterfaces;(2)adoptacommonasynchronousserialportexpansionchips,suchasTLl6c552(2way),LCl6C554(4channel);(3)usinggeneralI/Oanalogcommunication.Thisisthemostsimpleandeconomicalmethod,andcanachievehigh-speedserialcommunicationmethodSeeElectronicWorld)magazinepubli