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1、GsmandApplicationGSMisGlobalSystemforMobileCommunicationsacronym,whichmeansGlobalSystemforMobileCommunicationsistheworld'sleadingcellularsystemsintheworld.GSMisbasedonnarrowbandTDMAstandardthatallowsradiofrequencyinagroupcallatthesametime8.GSM80duringtheriseinEurope,putint
2、ousein1991.Theendof1997,hasoperationsinmorethan100countries,EuropeandAsiahasbecomethestandardinfact,thatby2001,theworld's162countrieshavealreadybuilta400GSMcommunicationsnetwork.ButtheGSMsystemcapacityislimited,usersinthenetworkoverload,ithadtoconstructadditionalnetworkfac
3、ilities.WhatisgratifyingisthatGSMperformanceinotherareas,whichinadditiontoprovidingastandardizedlistandsignalingsystems,butalsoopenedupsomeofthemoreintelligentofthebusinesssuchasinternationalroamingandsoon.TheconvenienceofGSMmobilephoneisthatitprovidesasmartcard,knownasSIM
4、cards,andcardcouldbeseparated,sothatthereplacementofmobilephoneusersandcustompersonalinformationinthisareaarefacilitated. GSMnetworktoimproveafteryearsofdevelopment,isnowverymature,lessblindspots,signalstability,automaticroaming,andthecommunicationdistancefromtheimpactofth
5、esurroundingenvironment.GSMshortmessageinparticular,flexibleandconvenient,youcancross-market,inter-provincialandevencross-bordertransmission,andeachsendashortmessageaslongasonedime,veryreliableandaffordable.Inaddition,themobilephoneSIMcardinrecentyearscanapplyfor0,somepack
6、agesuselowercostthanfixed.Thereforetheuseofmobilephonemessagetoachievealarm,ultralong-rangeremotecontrolforindustrialequipment,transmissionofdataisaverygoodchoice. GSMmodule,isasimilarmobilecommunicationmodule,integratesanumberofmobilephonefunctionsonasinglesmallcircuit
7、board,itcansendSMSmessages,callsandsoon,themoduleissmall,butithasalotofmobilephonefunctionality,withitshaveequalisthecoreofthemobilephone,anditisinalotofapplicationshaveawiderangeofapplications,GSMmodulethroughtheuseofATcommandstocontrolit,modulescanbeconnectedtocomputerRS
8、232serialport,canalsobeusedtocarryoutsingle-chipcontrol.Belowwecitesometypicalapplication