Transcription of MODBUS APPLICATION PROTOCOL …
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MODBUS APPLICATION PROTOCOL …
MODBUS -IDAJune 4, 2004 APPLICATION PROTOCOL .. of this document .. 22 Abbreviations .. 23 Context .. 34 General description .. description .. Encoding .. Data model .. Addressing model .. MODBUS 85 Function Code Categories .. Function Code codes descriptions .. (0x01) Read Coils .. (0x02) Read Discrete (0x03) Read Holding (0x04) Read Input (0x05) Write Single Coil .. (0x06) Write Single Register .. (0x07) Read Exception Status (Serial Line only) .. (0x08) Diagnostics (Serial Line only).. codes supported by the serial line devices .. and state (0x0B) Get Comm Event Counter (Serial Line only).
MODBUS Application Protocol Specification V1.1 Modbus-IDA June 4, 2004 http://www.Modbus-IDA.org 2/51 1 Introduction 1.1 Scope of this document
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