Open_ModbusTCP_Standard.pdf

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1、OPENMODBUS/TCPSPECIFICATIONRelease1.0,29March1999AndySwalesSchneiderElectricaswales@modicon.comOpen_ModbusTCP_Standard.doc13/29/99ContentsContents..................................................................................................................................................

2、.........21.Statusofthisspecification...........................................................................................................................32.Overview.........................................................................................................................

3、............................32.1Connection-oriented..............................................................................................................................32.2Dataencoding...................................................................................................

4、.....................................42.3Interpretationofreferencenumbers......................................................................................................42.4Impliedlengthphilosophy..........................................................................................

5、...........................53.Conformanceclasssummary.......................................................................................................................53.1Class0..............................................................................................................

6、.....................................53.2Class1...................................................................................................................................................53.3Class2........................................................................................

7、...........................................................63.4Machine/vendor/networkspecificfunctions.........................................................................................74.Protocolstructure.....................................