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《MODBUS application protocol specification》.pdf

发布:2015-10-19约12.94万字共45页下载文档
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MODBUS Application Protocol Specification MODBUS.ORG Content 1 Introduction 2 1.1 Scope of this document 2 1.2 References 2 2 Abbreviations 3 3 Context 3 4 General description 5 4.1 Protocol description 5 4.2 Data Encoding 7 4.3 MODBUS data model 7 4.4 Define MODBUS Transaction 9 5 Function Code Categories 11 5.1 Public Function Code Definition 12 6 Function codes descripitons 12 6.1 01 (0x01) Read Coils 12 6.2 02 (0x02) Read Discrete Inputs14 6.3 03 (0x03) Read Holding Registers 17 6.4 04 (0x04) Read Input Registers 18
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