1TheTC35imoldpieceintroductionCurrently,domesticalreadybeginningusageoftheGSMmoldpiecehavealot,andtheseoffunction,methodofusingdifferencenotbig.WhatthisdesignadoptionisaSiemensTC35theTC35ioftheseries.OnthiskindofwirelessmoldpiecefunctionandTC35andpermit,designtightlypacked,consumedlycontractedthephysicalvolumeofcustomersproduct.TheTC35iandGSM2/2andpermit,dual-band(GSM900/GSM1800),RS232thedataconnect,shouldmoldpieceandradiofrequencyelectriccircuitandJitakeandintegralwhole,providetowardthecustomerstandardofATorderconnect,isdata,speech,shortnewsandfaxprovidefast,credibility,safetyofdeliver,conveniencecustomerofapplicationdevelopmentanddesign.2UselyATintroductionThefollowisusellytheAt.3ThePDUcoderuleSendoutshortnewsincommonuseTextandPDU(ProtocolDataUnit,agreementdataunit)modecurrently.TheusageTextmodereceiveanddispatchamessagecodesimple,realizationgetupveryeasy,butthebiggestweaknessbetocantreceiveanddispatchChinesemessage；ButPDUmodenotonlysupportChinesemessage,alsotheabilitysendoutEnglishmessage.ThePDUmodereceiveanddispatchamessagecantheusagebe3kindsoftocode:7-bit,8-bitandUCS2code.7-thebitcodetousedforsendoutcommonofASCIIcharacterlist,8-bitcodeBeusuallyusedforsendingoutdatanews,UCS2codeusedforsendingoutUnicodecharacterlist.GeneralPDUscodeisconstitutebyABCDEFGHIJKLM13.A:Theaddresslengthofthemessagecenter,216entertomakenumber(onewordstanza)B:Thenumbertypeofthemessagecenter,216entertomakenumber.C:Messagecenternumber,B+ClengthwillfromthedatadecisionintheA.D:Documentheadwordstanza,216entertomakenumber.E:Informationtype,216entertomakenumber.F:Drivecallnumberlength,216entertomakenumber.G:Drivecallnumbertype,216entertomakenumber,takevaluetogetherB.H:Drivecallnumber,lengthfromdatawithinFdecision.I:Agreementmarking,216entertomakenumber.J:Thedatacodeaproject,216entertomakenumber.K:Termofvalidity,216entertomakenumber.L:Customerdatalength,216entertomakenumber.UselyATATinstructionfunctionAT+CMGCSendanSMScommend(issueamessageorder)AT+CMGDDeleteSMSmessage(deleteSIMcardtheinformationofthememory)AT+CMGFSelectSMSmessageformat(choiceshortnewsinformationformat:0-PDU；1-文本)AT+CMGLListSMSmessagefrompreferredstore(listshortPDU/TEXTofthenewsformatintheSIMcard:Inordertoread0RECUNREAD,oneRECREADinordertohavealreadyread,2STOUNSENTsisadue-out,3STOSENTisalreadyhair,4ALLisallAT+CMGRReadSMSmessage(readshortnews)AT+CMGSSendSMSmessage(thehairshortnews)AT+CMGWWriteSMSmessagetomemory(towriteintheshortnewsofdue-outintheSIMmemory)AT+CNMINewSMSmessagestorage(themanifestationlately-receiveshortnews)AT+CPMSPreferredSMSmessagestorage(thechoiceshortnewsmemory)AT+CSCASMSservicecenteraddress(thechoiceshortnewsmemory)AT+CSCBSelectcellbroadcastmessagemessages(choicebeehivebroadcastinginformation)AT+CSMPSetSMStextmodeparameters(constitutionshortnewstextoriginmodeparameter)M:Customersdata,itslengthfromthedatadecisionintheL.EnactmentinJadoptionUCS2code,hereistheUnicodecharacterlistofChinese-English.4RS-232InterfaceRS-232isoneofthenormallyusedinterfacesatanytime,itnotonlybuiltineveryPC-set,butalsobuiltinanytypesofcomputerswhicharefrommicrocontrollertohostcomputers,andequipmentconnectedwiththem.ThegeneralusageofRS-232istoconnectamodern,theotherarrangementswithRS-232interfacesincludeprinter,datacollectionmodule,testingdeviceandcontrolloop.RS-232canbealsousedinthesimplelinkofanytypeofcomputer.RS-232isdesignedtodealwiththecommunicationbetweentwoarrangementswithdistancelimitationfrom50to100ft,whichdependonPotterrateandtypeofelectriccable.BecauseofwideapplicationofRS-232port,itsotherusageistolinkanothertypeofadapterconvertedformtheport.Forexample,asimpleloopchangesaRS-232intoaRS-485port.Theportcanbelinkwithseveraldevicesbymeansofalonglead.Non-equilibriumleadisusedtolinkedtoRS-232.Althoughnon-equilibriumshouldsomethingavoidable,itonlyreferstotheelectricpropertyofthesignalinlead.Inanon-equilibriumlead,signalvoltageisappliedtoanotherlead,allhasanothertechnicalterm“signalend”.AdvantagesinRS-232RS-232isusedeverywhere.EveryPC-sethasoneormoreRS-232ports.TherenewedcomputerssustainotherserialinterfaceslikeUSB.ButRS-232candomanythingswhichUSBcantdo.Inthemicro-controllerinterfacechipcanbeeasilyusedtochangeintoRS-232.Thejointingdistancecanreach50-100ft.Manyexternalinterfacesarenotusedfortoolongdistance.ThelongestdistancejointofUSBcanreach16ft.ThedistancebetweenparallelprinterinterfaceonthePC-setandthehostcomputercanreach10to15ft,or30ftbyusingTypeTEEE-1284Bdriver.ButRS-232canusethelongerelectriccable.IfeveryRS-232portislinkedwithamodern,Telephonenetworkcanusedtosenddataintherageoftheworld.Foradoublelink,3leadsareneeded.Aparallelcircuitgenerallyneeds8datalines,twoormorecontrolsignallinesandgroundwires。Itismoreexpensiveifmoreleadsandbiggerconnectorsareused.DisadvantagesinRS-232Ifonesideoflinkneedsparalleldata,ithastotransformserialintoparalleldata.ButifitiseasilyrealizedaUARTisused.Becauseoftheserialportsouseful,itismaybehardertolookforafreeserialportPC-setmayhavemanyserialports,butasystemmaybecantdistributeasolebreakingenquiringsignaltoeveryserialport.Mostmicro-controlleronlyhasonehardwareserialport.Nomorethan2setinonelink.Thebiggestdesignatedtransmittingrateofdatais2000bits/s.Butmanyinterfacechipcansurpassthisnumericalvalue,especiallyintheshortdistancelink.Alongerlinkneedsadifferentinterface.basicsignalsofthedoubleRS-232communicationasfollows:TD.TransformdataDTEtoDCEItsalsocalledTXandTXD.RD.TransformdataDCEtoDTEItsalsocalledRXandRXD.SG.Signalland.ItsalsocalledGNDandSGND.VoltageLogic0isapositiveRS-232voltage,thelogicelectriclevelofRS-232isindicatedwithpositive-negative,andnotonlyusethepositivevoltagesignalofthe5VTTLandCMOSlogictoindicate.Inthedatalogger(TD)ofRS-232，alogic0isdefinedequaltoorhigherthan+5V,andaLogic1definedequalto-5Vorlowerthan-5V.Inanotherword,signalusethenegativelogic,inthislogic,thenegativevoltageisLogic1.Controlsignalusesthesamevoltage,butitusespositivelogic.Apositivevoltageindicatesthisfunctionisonandanegativevoltageindicatesthisfunctionisoff.RS-232interfacechiptransformthesesignalsinreverse.InoutputpinofoneUART,Alogic1datumoraoffcontrolsignaliscloseto5V,itproducesnegativevoltageontheinterfaceofRS-232.Alogic0datumoranon-controlsignaliscloseto0V,itproducesapositivevoltageontheinterfaceofRS-232.BecauseoftheRS-232receptormaybeattheendofalongelectricalcable,whenthesignalreachesthereceiver,itsvoltageisprobablyweakerorwiththenoisesignal.Inconsiderationofthiscircumstanceminimumatthereceivershouldbelowerthanthevoltageatthedriver.Aninputhigherthan+3VontheRDareaLogic0,oronacontrolinputisopen.Aninputlowerthan-3VontheRDareaLogic1,oronacontrolinputisoff.Accordingtothisstandard,inputlogicelectricallevelbetween-3Vand+3VhavenodefinitionNoisetolerablelimitationorvoltagetolerablelim