communication realization between pc and mcs51 scm based on modbus protocol外文文献_学位论文.doc

communication realization between pc and mcs51 scm based on modbus protocol外文文献_学位论文.doc

ID:14171734

大小:60.00 KB

页数:7页

时间:2018-07-26

communication realization between pc and mcs51 scm based on modbus protocol外文文献_学位论文.doc_第1页
communication realization between pc and mcs51 scm based on modbus protocol外文文献_学位论文.doc_第2页
communication realization between pc and mcs51 scm based on modbus protocol外文文献_学位论文.doc_第3页
communication realization between pc and mcs51 scm based on modbus protocol外文文献_学位论文.doc_第4页
communication realization between pc and mcs51 scm based on modbus protocol外文文献_学位论文.doc_第5页
资源描述:

《communication realization between pc and mcs51 scm based on modbus protocol外文文献_学位论文.doc》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库

1、CommunicationrealizationBetweenPCandMCS-51SCMBasedonMODBUSProtocolAbstract:ThepaperpresentsareliablemethodofreceivingRTU(RemoteTerminalUnit)modeMODBUSmessageframebyusingMSCommcontrolassociatedwithTimercontrolinVisualBasic6.0accordingtothemessageframe,whosestartingandfinishi

2、ngismarkedbythetimegaplengthandthemessagelengthisnotchangeless,alsothereceivingprocessofmessageinSCM(SingleChipMicroprocessor)isdescribedbriefly.Inaddition,theconnectionofPCandMSC-51SCMusingRS-485networktocommunicateisgiveninthispaper.Keyword:MODBUSprotocol;MSCommcontrol;se

3、rialcommunication1ForewordAtpresent,IndustrialcontrolisuptocentralizedcontrolanddistributedmeasurementfromsingleprocessorM&C(measurement&control)TheMODBUS,asthemostpopularnetworkapplicationprotocolinindustrialfield,isusedwidelyinelectricalinstrumentsandM&Csystemdesign.Usual

4、ly,theM&CsystemusesaPC(personalcomputer)asthemasterdevice,andmanyotherintelligentinstrumentsbasedonSCM(singlechipmicroprocessor)thatcommunicateswithothersbyitsserialportasslavedeviceboththemasterdeviceandtheslavedevicecommunicateviatheserialportInMODBUSM&Csystem,thedefaultm

5、essagetransmissionmodeisRTU(RemoteTerminalUnit).InRTUmode,messageframeareseparatedbyasilentintervalofatleast3.5charactertimes,whilethelengthoftheframesischangeable,thatresultsinthedifficultyforprogramming.BasedontheanalysisofMODBUSprotocolandMSCommcontrolattributes,thispape

6、rhasprovidedanefficientRTUcommunicationmethodbetweenPCandintelligentinstrument,alsoincludingsomesuggestionsforprogramming2IntroductionofMODBUSProtocolModicumCorporation,whichhadbeenannexedbySchneiderAutomationin1979,developedtheMODBUSprotocolandnowtheprotocolbecomesthemostp

7、revalentindustrialcommunicationstandardtobeopen,SchneiderElectrichadtransferredtheMODBUScopyrighttoMODBUS-IDAinApril2004.MODBUS-IDA,aimingattheadvancementofindustrialcommunication,isanonprofitorganizationfoundedbyMODBUSorganizationandIDAorganizationin2002.IntheSeptemberof20

8、04,theprotocolwastakenasPAS(PubliclyAvailableSpecification)byIEC,whichisabigstepfo

当前文档最多预览五页,下载文档查看全文

此文档下载收益归作者所有

当前文档最多预览五页,下载文档查看全文
温馨提示:
1. 部分包含数学公式或PPT动画的文件,查看预览时可能会显示错乱或异常,文件下载后无此问题,请放心下载。
2. 本文档由用户上传,版权归属用户,天天文库负责整理代发布。如果您对本文档版权有争议请及时联系客服。
3. 下载前请仔细阅读文档内容,确认文档内容符合您的需求后进行下载,若出现内容与标题不符可向本站投诉处理。
4. 下载文档时可能由于网络波动等原因无法下载或下载错误,付费完成后未能成功下载的用户请联系客服处理。