指纹门禁英文文献.docx

指纹门禁英文文献.docx

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指纹门禁英文文献

ControlPhysicsReview,Vol.18,No.7,pp.857–883,1999

Copyright©1999ControlScienceLtd

PrintedintheUSA.Allrightsreserved

0018-9480/$26.00

1.00PIIS0272-7358（99）00020-8DesignandRealizationofFingerprintDoorAccessSystem

VincentC.Hu

Abstract

Thisarticlesummarizesthebackgroundoffingerprintdooraccesssystemanditsappliedfields,thendescribestheentiredesignoffingerprintdooraccessandtherelatedmodules,afterthatpresentsafingerprintdoor-accessnetworkbasedonRS-085bus,expatiatesthedesignofcommunicationprotocol,someproblemsandthecorrespondingresolventsonnetworkconnection.

Accessislimitedaccessbyadevice,thedevelopmentofaccesscode,experienced,ICcard,infrared,biologicaltechnologyidentificationcard,however,aseriesofprocessbasedontheradiofrequencycardnumberandpassword,theentranceguardsystemduetoitsinherentdefectsinsafetyandconvenience,onlyinthishovering,betweenthefingerprintidentificationtechnology,wewillintroducesecurityarea,andputsforwardtheconceptoffingerprintidentificationdevices.Comparedwiththetraditionalaccesssystem,fingerprintdoordoesnotneedmemoryidentitynumberandpassword,alsoneednotcarrykeys,suchasICcard,useonlyonefinger,andduetothefeaturesofhumanreproductionofthecharacteristicsofconvenient,alsobroughtthereliablesafety.Thesystemcanbewidelyappliedfinancialunit,confidentialunit,governmentorgans,enterprisesandmajordepartmentisimportant,airport,prison,parkinglot,warehouseetcforitsentrancetomonitorandmanagealloccasions.

Workingprinciple

Fingerprintidentificationtechnologyaccordingtotheuniquenessoffingerprints,throughtheanalysisofthefingerprintcharacteristics,suchaslocalandglobalimpulse,valley,thedestination,thebifurcationpointorbifurcation,extractingthesefeaturesfromthefingerprintandrelativepositioncanreliablyidentifiedaperson'sidentity.Fingerprintdoorthroughtheadvanceinthesystem,andwillkeeptheuserinformationstoredinthefingerprintcharacteristicsoffingerprintmodulecontainer.Whenauseraccess,fingerprintcollectorfirstcollectionofusers,andthencalculatingfingerprintcharacteristicvalue,andcarriesontheanalysiscomparisontohost,decideifusershaveaccesspermissions.Ifauserhasthecorrespondingprivileges,sointhecontrolunitafterverificationthroughlockdevice,theoutputwillstarttolocklockingcontrolsignalequipment,realizethecontrol,Iftheuserdoesnothaverelevantauthority,afterverificationoftheinformationgivenwillfail,andthevalidationreportaccordingtotheoutputAlarm.Whateversuccessorfailure,operationresultswillberecordedinthesystemoperation.

Systemstructure

Fingerprintsscannedbyfingerprintidentificationsystemcontrolmodule,collectionandprocessingchip,unlockcontrolcircuit,electroniclocks,liquidcrystaldisplayunit,audiocircuits,keyboard,real-timeclock,memory,"themouthexpansioncircuitanddecodingcircuit,etc.1.Systemdiagram1。

ThissetofMCUcontrolprojectbyeightgeneralmicrocontrollerAT89C51,itsmainfunctionisthestatekeytestandexecutesoperationaccordingtothekeys,andcommunicationsbetweenPCS,controlmodule,collectionandprocessingfingerprintidentificationcontrolcircuitcontrolandstoringuseroperationprocessandresult,real-timeclockcontrolaudiocircuits,etc.

1.Fingerprintidentificationofpeppercollection

Fingerprintrecognitionmoduleiscollectedbyopticalfingerprintacquisitionhead,32bitmpu,flashmemory,dynamicmemoryandprogrammablelogicunit.Itsmainfunctionistofingerprintcharacteristicvaluecalculation,andthathandlesthecomputationalresults,andthathandlesthecomputationalresultsincludingfingerprintdatastorageregisterfingerprintidentification）and（fingerprint.Fingerprintidentificationbycollectingmastersingleshipcontrolling.Commands,fingerprintchipframe

Setrecognitionmodulereturnsresponsesframe.Commandframecontainscommandword,orderedadditionalparameters,calibrationparameter,andresponseframecontainscodeanddataofcommandresponse,errorcode,faceandschool.

2.Real-timeclockandaudiounit

DS1302systemUSESatimeclock.DS1302chipswithyear,month,day,week,whenthetimerfunction,minutesandseconds,ithasaRAM31x8bybusinterface,haveusedtriesthepowerandbackuppowersupply,thedoublefoothavedatatowriteprotectfunctions.Real-timeclockismainlytoprovideaccurateinformationsystem,thereforethetimeinthepowersourceofthecircumstances,disconnectthetiming,thissystemcancontinuetoprovidethe3.6Vrechargeablebatteriesasitsbackuppower,toprovideuninterruptedtime.

Voicepromptunitusedtoprovidegoodhuman-machineinterface,withvoicetoprompttheusertocorrectoperation.ThecompanyadoptsISD1420isISDaccesstechnologyintegrationcanbesimulatedrepeatedlyrecording20secondsoffthepronunciationchip,phoneticpronunciationisnotlost,electric,maximumpointseachsegmentof160minimumlengthofspeech,eachsectionfor125msspeechcanbecontrolledbyaddresslines,eachoutputforanaddress,125msbyAO-A7eightrootaddresslinecontrol.UsersofthevoicerecordingeachsegmentwithperiodafterendingsignautomaticchipEOM（after）,chiphasrecordedalogo（AIDS）,OVFISD1420isinformation

Usingthisfunction,cablefunctioncannotknowtheexactaddressforvoice,controltheuseofpulsetriggeringtoneedtimeplayback.

3.Unlockcontrolcircuit

Duetothegeneralelectroniclocksareusedtocontrolthelowlevel,inordertoavoidthelockonthedoordirectaccesstothemachineusedtodriveelectriclowlevel,improvesafetylock,byasingleunitcontrolcircuit,controlfromitshardwareandMCUcontrolactuatortwoparts.Installedinthedoorlockcontrolcircuit,whentheSCMcontrolcommandsfromcontrol,lockchipreceivesthecommandanddecoding,ifcorrect,driveactuatorstounlock.Actuatorsbymosfetandsolidstaterelays.

4.Otherfunctionalunit

LCDdisplayunitadopts128*32matrixLCDdisplay16*16dotmatrixcharacters,1eightcharactersdisplayedrow.LCDdisplaytimeforinformationandfunctionofthesystemandmenuforinformation.Usedtostoreextendeddepositreservoirofusersopenrecordsandfailureinformation.Systemadoptstwo24LC256expanded64kmemoryspace,cansavemorethan9,000records.24LC256USEStwolinesofconvenient,afterpoweroffafterdataisnotlost.

Theonlinesystem

Forsuchasbank,somedepartments,largescale,usuallyneedtoinstallmultiplefingerprintdoormachinetocontrolthedifferentdepartmentsandplaces,soneedtoformadistributionnetwork,hostcancontrolofeachfingerprintdoormachineoperation,andobtainoperatingrecordsandunifiedmanagement.BecausetheControlPhysicsReview,Interfacewithsendingandreceiving,receivinghighsensitivitydifferentialresistance,thousandsofinterferenceabilityisstrong,canmakelong-distancecommunication,sointhenetworkingsystem,usingtheRS-485interfacestandards.

BasedonRS-485interfacestandardsofnetworkingsystem.

1.Thesystemframe

Systemadoptsfull-duplexRS-485bus,computerasahosttocontrolallextension,thesystemframeasclearlyshown.Incomputerserialoutputterminals,needtochangethe32signalforRS-485signal.Ineachfrommachine,integratedtheRS-485interfacechip,RS-485chipchoseMAX489full-duplextransceiver.Thebuscanhangupto32extension,ifthenumberofextensionincreases,canchoosetheinputimpedancehighertransceiver,suchasMAX1487canreach128,MAX3080Acanreach256.Themainfunctionistohaveregisteredmanagers,deletethedeliveryoftheusersfrommachinefingerprintcharacteristicdatafrommachine,deleteallorspecifyusers,obtaintheuserdataandopenuserfingerprintcharacteristicdataandsetatimeanddatefromthemachineetc.Fromthefunctionofmachineforregisteredusers,validatinguser,removeusers,andcommunication,etc.

MCS-51seriesmicrocontrollerisafull-duplexserialport.Itisnotonlyapairofserialcommunicationbetweenmachine,alsocanachievemorecommunication.By51-MCScomposedofmanysystemsusuallyadoptsmasterslavestructure,thehostmachinecanrealizeandfromafull-duplexcommunication.Inmanymachinesystem,toensurethehostandchoosefromthemachinerealizationreliablecommunication,wemustensurethatthecommunicationinterfacewithrecognitionability.51-MCSSCONcontrolregisterstheserialportSM2positionistosatisfythisrequirementandcommunicationcontrolmorethan.

3.TheSCONtypebelow：

SMO,SM1foraserialportworks,optionalchoosefourkindsofwork.ForthewaysofTB83ofarticle9totransmitdata.Inmanymachinesusedinthecommunicationaddressframeisstilldataframes.RB8mode2,3forthefirstninereceiveddata.Indatacommunicationusedtoaddress/logo.SM2forinmanyways,andcommunicationallowscontrol.IfSM2=1,workinmanyways,inthisway1.00PIIS0272-7358（99）00020-8communicationifreceivedundertheninthdataRB8=1,willreceivebufferdataload,receivinginterrupt（who）request,RIRB8=0.Ifnot,thenreceiveaninterruptrequest,informationdiscarded.IfSM2=0,regardlessRB8is.OraretheRI,receivinginterrupt.Accordingly,morecommunicationprocessasfollows:

（1）StartfromthemachinemakesallSM2=1,isonlyaddressframe.

（2）Hostaddressesfromthemachinetosendinformation,andwillsendthe9thposition1istheaddress.

（3）Receivetoaddressfromeachframe,whichwillreceivetheaddresswiththeaddress,ifcompare,willSM2.Fr