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1、ABSTRACTDuringtherapidconstructionperiodofsmartgridandwisdomcity,itraiseshigherrequirementstoautomationlevelofindustiy;thekeytosolvetheproblemistobuildunifiedcommunicationsnetworkandprotocol.Fieldbusnetworkandprotocolwidelyusedalreadycan'tmeettherequireme
2、ntsinthecompatibilityaspectandcommunicationdistanceandspeedaspect,therapiddevelopmentofEthernettechnologyraisesanewopportunitytosolvetheproblem,wecanlearnfi*omadvantagesoffieldbustosolvethekeyproblemofEthernet,Ethernettechnologylearnfromfieldbus'sstrength
3、stooffsetitsweakness,finallyitunifiedtoindustrialEthernetgradually,thisrepresentsthelatestdevelopmentdirectioninthefieldofindustrialcontrol.Modbus/TCPPlatformisoneoftheprominentrepresentativesoftheintegrationoffieldbusandindustrialEthernet;therearebroadpr
4、ospectsfordevelopment.ThispaperiscommittedtosolvetheproblemsofinterconnectionandcommunicationthatisbetweentheModbusserialbusandModbus/TCPindustrialnetwork・AnditdesignedanddevelopedaremotecontrolgatewaybaseonModbus/TCPprotocol.Firstly,thispaperdiscussedthe
5、researchbackgroundandmeaning,thenitintroducedtheresearchstatusathomeandabroadandthekeytechnologytoimplementindustrialEthernetcommunicationadapterbasedonModbus/TCPprotocol;italsoconductedresearchonarchitectureandcommunicationmechanismofthesetwokindsofproto
6、col.Thispartprovidetheoreticalbasisforthefollow-upworks.Secondly,thispaperdesignedsupportinghardwareandcoresoftwareofthiscommunicationadapterusedmodulardesignthoughtbasedonabovetheoreticalstudy.Thehardwareselected16-bitsinglechipofFreescaleasthecore,itdes
7、ignedMCUmodulecircuit,powerdrivecircuit,EIA-485serialportdrivecircuit,Ethernetinterfacedrivecircuit,resetandcrystalresonancecircuit,communicationstatusindicationcircuit;ThesoftwareselectedVC++asdevelopmentplatformandCodewarrior5.1asdevelopplatform,itdesig
8、nedOpenTCPprotocolstackmodule,EthernetandModbusserialsportcommunicationmodule,communicationparameterconfigurationmodule.ItcanrealizeinterconnectionandinterflowbetweenModbusandEthernetthroughthecooperationofsoftwarea
