codesubuntu10.04

DesignofCentralizedRemote-readingMeterSystemandIntelligentNetworkWaterMeterChuanfengLiSchoolofComputerandInformationEngineeringLuoyangInstituteofScienceandTechnologyLuoyang,Chinalichuanfeng@sina.
comChenLiSchoolofComputerandInformationEngineeringLuoyangInstituteofScienceandTechnologyLuoyang,Chinaleilacoffee@163.
comWenguangDiaoSchoolofComputerandInformationEngineeringLuoyangInstituteofScienceandTechnologyLuoyang,Chinalitdwg@gmail.
comShuranZhangSchoolofComputerandInformationEngineeringLuoyangInstituteofScienceandTechnologyLuoyang,Chinazhangsr9@163.
comAbstract—Thispaperdescribesadesigntodevelopacentralizedremote-readingmetersystemwhichusedtoovercomeshortcomingsofthetraditionalmanpower-basedreadingmeter.
Thesystemisdesignedfromthehostcomputer,networkmeterandconcentratorthreeparts.
Concentratorisconnectedtothehostcomputer,soremotemetercouldberead,monitoredandmanagedbythehostcomputer.
Thehostcomputerconsistsofclient,server,dataserviceanddatabase,developedbyC#languageandSQLServer.
ThenetworkwatermeterisbasedonSTC89C52RCmicrocontrollersendingdatatotheconcentratorthrough485bus.
TheconcentratortakingARM9andLinuxasthecore,readmeterdataby485bus,andsenddatatoserverthroughEthernet.
Thetestresultsshowthattheremote-readingmetersystemisaccurate,simple,real-time,secure,reliable,andeasytoapplication.
Keywords-remotesystem;networkwatermeter;concentrator;ARM9;LinuxI.
INTRODUCTIONAtpresent,readingdataofresidents'ammeter,watermeterandgasmeterisachievedbymanpower.
Readingmeterpeopleshouldtaketimetocheckmetersfromdoortodooreverymonth,whichconsumesalotofmanpower,materialresources,time-consumingandlowaccurate.
Tosolvethis,thecomputer-basedreadingmetersystemisusedtoreplacemanpower-basedsystem.
Remotereadingmetersystemusingintelligentinformationmanagementcanbeputintouseinresidential,apartmentintelligentmanagement.
Studyonautomaticreadingmetertechnologyabroadmaybestartedinthe1970s,afterdecadesofdevelopment,thetechnologyisrelativelymature,andhasbeenwidelyused.
InChina,thedevelopmentofremoteautomaticreadingmetersystemstartedlaterthanabroad,thetraditionalmanualreadingmetersystemisstillwidelyused,whichcreateabigpotentialmarketespeciallyremoteautomaticreadingmetertechnologydevelopingrapidly,soautomaticreadingmetertechnologywillgraduallyreplacethetraditionalreadingmeter[1-4].
Thesystemconsistsofsoftwareandhardwarecomponents,usestechnologiessuchasembeddedtechnology,networkcommunication,multitaskandsoon.
Thesystemconsistsofthehostcomputer,concentratorandnetworkmeter.
HostcomputerisC/Sstructure,usingmulti-threading,WCFandothertechnologies,isresponsiblefordataanalysis,watermonitoringandmanagement.
Concentratorusingembeddedtechnologyisresponsiblefordatareceivingandforwarding[5].
NetworkmeterusingSCMtechnologyisresponsibleforwaterflowdatareadingandforwarding.
Thesystemismainlyusedforresidential,dormitoryandotheroccasion'sintelligentmanagement,sopropertystaffgetsareal-time[6,7].
ChapterIIismainlytoanalyzethesystemanddrawageneralframeworkmap,andchapterIIIismainlytoanalyzethespecificdesignofhostcomputer,setforththespecificfunction,thedatadictionary,storedproceduresandsoon.
ChapterIVanalyzestheparticulardesignoftheconcentratoranddescribesrelatedtechnologiessuchasTCP,multithreading,andgivestheschematicdiagramoftheconcentratorandtheassociatedflowchart.
ChapterVismainlyanalyzesspecificnetworkmeterdesign,summarizesthespecificmethodsofsystemtesting,andtestresults.
Finally,givesconclusionsandfuturedirectionsforimprovement.
II.
SYSTEMSTRUCTUREDESIGNThesystemconsistsofahostcomputer,concentrators,andnetworkmetersthreemajorcomponents.
MeterusingSTC89C52microcontrollerreadstheresident'sactualwaterconsumptionatregulartime,fulfillsdatacollection,storage,transmissionandothertasks.
ConcentratorusingS3C2440microprocessor,whichhasaclockspeedupto400MHz,isresponsiblefordataforwardingandstorage.
HostcomputerusingC/Sstructuredesign,consistsofserver,client,dataserviceanddatabase.
Whenreadingmeterdataisrequired,hostcomputersendcommandstotheconcentratorviaEthernet,theconcentratorwillanalyzedataandsendcodestometersconnectedthrough485bus,whichcheckreceivedcodeswithinsidecodes,sendwaterInternationalConferenceonMechatronics,Electronic,IndustrialandControlEngineering(MEIC2014)2014.
Theauthors-PublishedbyAtlantisPressusagedatatoconcentratorthrough485busifcodesreceivedisconsistentwithinsidecodes[8].
GeneralframeworkisshowninFig.
1.
RS-485BusRS-485BusEthernetConcentratorPCFigure1.
SystemprincipalbodystructureIII.
DESIGNOFTHEHOSTCOMPUTERA.
SystemStructureHostcomputermanagementsystemconsistsofserversoftware,clientsidesoftware,dataserviceanddatabase[9],systemdataflowisshowninFig.
2.
DatabaseDataserviceServerReturndataCallserviceClientConcentratorNetworkmeterSevercommandTransmittotheserverTransmittometerWatermetercodeWaterconsumptionFigure2.
SystemdataflowchartB.
DesignofDatabaseThesystemneedsstoreclientdata,userdata,waterconsumingdataandreadingtimeinformation,sodatabasehascorrespondingtableforeach.
Storeproceduresareusedtofulfilloperationsontables.
TABLEI.
T_ROLETABLETABLETYPESTYLESFieldnameDatatypeLengthAllownullPrimarykeyNotesUsernamevarchar15NYPasswordvarchar15NTABLEII.
T_USERTABLEFieldnameDatatypeLengthAllownullPrimarykeyNotesUsercodevarchar30NYNamevarchar20NSexchar2NIDnumbervarchar18NPhonevarchar15NAddressvarchar50NWatermetercodingvarchar20YTABLEIII.
T_WATERTABLEFieldnameDatatypeLengthAllownullPrimarykeyNotesNumbernchar15NYWatermetercodingnchar15YWaterconsumptionfloat0YTimedatetime0YTABLEIV.
T_READDATATIMETABLEFieldnameDatatypeLengthAllownullPrimarykeyNotesNumbervarchar50NYStatetinyint0YC.
DesignoftheServerSoftwareThefunctionofserverismainlykeepingconnectwithconcentrator,queryingtableT_readingTimeandcheckingstatusvalueinthetable,ifstatusvalueequals1,meaningmeterdatashouldbeuploadtoserver;afterreceivingdata,serverdecodesdataandupdatedatabasedata,displaysitatuserinterface.
(1)DesignoftheServerSoftwareServersoftwaredesignprocessisshowninFig.
3.
(2)DetectionmoduleDetectionmoduleprocessisshowninFig.
4.
BeginOpenlinkButtonpressEstablishTCPServerEstablishReadTimerWhetherthereisaconnectionEstablishClientFuncNYNYFigure3.
TheserversoftdesignprocessBeginDatareadingtimeThreadhangupIfitisthelastcodeRecordthecurrentpasswordSendtoallconcentratortogetdataNYNYFigure4.
ThedetectionmoduleflowchartD.
DesignoftheClientClientsideconsistsofdatastatistics,customerinformationmanagement,usermanagementandsystemsettings.
Datastatisticsisachievedbasedoncustomernameandtimespan,customerinformationmodulecanaddcustomers,deletecustomersandmodifycustomersinformation,administratorscanchangethepasswordthroughusermanagement.
ClientSidefunctionalblockdiagramisshowninFig.
5.
ClientUserloginStatisticaldataCustomerinformationUsermanagementSystemsettingsFigure5.
TheclientfunctionblockdiagramFigure6.
DatastatisticsUserscanqueryallcustomers'waterusageinformation,thenonlythetotalstatisticalquery,whencometoindividualcustomer,theusageinformationcanbequeriedtotallyorpartially,UserinterfaceisshowninFig.
6.
IV.
CONCENTRATORDESIGNA.
TheBlockDiagramofConcentratorSystemConcentratorbasedonARM9andLinuxoperationsystem[10,11],consistsofEthernet,serialcommunications,resetcircuit,powersupplymoduleandsoon.
ConcentratorsystemblockdiagramshowninFig.
7.
S3C2440PowermoduleClockcircuitResetcircuitEthernet485communicationFigure7.
TheblockdiagramofconcentratorSystemB.
SystemConcentratorSoftwareDesignInsoftwaredesign,Linuxmultithreading,Socketcommunication,serialcommunication,filemanipulationtechniquesareinvolved.
Thetotaloffoursub-systemsofthreads,andtheirfunctionistoreaddata,writedatavianetwork,readdataandwritedataviaserialports.
Whentheprogramstarts,itreadsSr.
llzfile,thefilewillbeencodedintoasinglelinklistinordertocommunicatetothemeterlater.
InUbuntu10.
04generatesanARMexecutableprogrambyarm-linux-gcc,thentheprogramwillbeportedtoARM,addedtothestartupitems,theprogramcanautomaticallystartatboottime.
ProgramflowchartisshowninFig.
8.
BeginReadfileConnecttoserverOpentheserialportCreates4threadsSerialreadthreadSerialsendthreadNetsendthreadNetreadthreadWaitforthe4threadendsClose(serialfd)Close(socketfd)DestroythelinkedlistEndFigure8.
TheconcentratordesignprocessV.
THENETWORKWATERMETERDESIGNNetworkWaterMeterisbasedonSCM,themainfunctionsisreadingthepulseviaSCM,thenmakeanalysisandcalculation,convertingintowaterdosage,showingitinthe12864LCD,andstoringitintheAT24C16,whenthedatauploadcommandisreceived,uploadingdataby485bustoconcentratorwhichthenuploadittohostcomputerviaEthernet.
MeterblockdiagramshowninFig.
9.
STC89C52PowermoduleClockcircuitResetcircuitLCDDatastorage485communicationFigure9.
ThewatermeterblockdiagramA.
WaterFlowAcquisitionModuleInthewatermeteracquisitionmodule,thewaterflowsensoristhecore.
Waterflowsensorismainlymadeofaplasticbody,theflowoftherotorassemblyandtheHallsensor.
UsingUSN-HS21TBHallflowsensorinthiswatermeterandthesensoriscalculatedasEq.
1.
F(Hz)=8.
1*flowrate(Q)-6(l/min)Q=L/Min(1)Figure10.
Thesquare-wavepulseThewaterflowsensormountedinletsidetodetectwaterflow,whentheflowofwaterthroughtherotorassembly,magneticrotorandspeedchangesastheflowratechanges,theHallsensoroutputcorrespondingsquarewavepulsesignalbacktothecontroller,whichdeterminesthedosageofthewaterflow,calculatetheactualwaterconsumption.
SquarewavepulsesignalisshowninFig.
10.
B.
SoftwareDesignThedesignofwatermetersoftwareadoptsthemodularprogramming,whichisshowninFig.
14.
BeginLCDinitializationIICinitializationUARTinitializationIftheconnectionconcentratorWhile(1)ReadpulsedataLCDIftheserialportreceivedataSendingdatatotheconcentratorbythe485busNYNYFigure14.
TheflowchartofwatermetersoftwaredesignC.
DesignTestingAnalysisofSystemWhentheservertaskstarting,itwillsetuptaskexecutioncycle,thatcycleofreadingthemeterdataandtheserverreadsthedatabase.
Ifitneedstoreadthewatermeterdata,thensendscommandstoconnectconcentrators.
AfterconcentratorsreceivesGETDATAcommands,sendsreadingmetercodingtoeachmeterinsinglelinkedlist,ifconsistentwithitsowncode,metersendmeterdatatotheconcentratorthrough485bus,concentratorthensenddatatotheserver.
Throughoutthetest,themeterdataissenttoserverbetween0-9.
D.
TestingResults(1)Thewatermeterreceivedcodefromtheconcentrator.
(2)ConcentratorreceivestheGETDATAcommand,andsendscodetowatermeter,receivewatermeterdata.
(3)Theserverreadthedatabase,sendsGETDATAtotheconcentrator,receivingareadisplaysthereceiveddata,andupdatesthedatabasethroughanalysis.
(4)Thepartoftheclientreadsthedatabaseandobservestheupdatedresultsofwateryield.
VI.
CONCLUSIONThispaperdescribesadesigntodeveloparemotecentralizedreadingmetersystemwhichcombinedsoftwareandhardwareusing485busandEthernetasdatatransmitmedia.
ServercansendreadcommandtoeachconcentratorviaEthernet,concentratorthensendcommandtoeachwatermeter,watermetersentmeterdatatotheconcentratorthrough485busafterreceivingthecommand,andthentheconcentratoruploaddataviaEthernettotheserver.
Clientsidecanviewandcontrolconsumers'watermeters.
Thevariousfunctionsofthesystembasicallycompleted,buttherearesomeneedsfurtherimprovement.
Concentratorprogramisaterminalprogram,thenextsteptocompletetheinterfacedesignandrealizeusingotherdatabaseasdatastore.
Eveniftheserverfailsoristurnedoff,thedatacanbesavedintime.
Itwillreadsthedatainconcentratordatabasewhentheserveristurnedon.
ACKNOWLEDGMENTThisworkwassupportedinpartbythescienceandtechnologyresearchprojectofeducationdepartmentofHenanProvince(14A510009),thefundingschemeforyouthteacherofHenanProvince(2012GGJS-191),thescienceandtechnologykeyprojectofHenanProvince(142102210568,142102210063).
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