Transcription of MODBUS APPLICATION PROTOCOL SPECIFICATION V1
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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) .. 12 (0x0C) Get Comm Event Log (Serial Line only) .. 15 (0x0F) Write Multiple Coils .. 16 (0x10) Write Multiple registers .. 17 (0x11) Report Slave ID (Serial Line only) .. 20 / 6 (0x14 / 0x06 ) Read File 21 / 6 (0x15 / 0x06 ) Write File Record .. 22 (0x16) Mask Write 23 (0x17) Read/Write Multiple registers .. 24 (0x18) Read FIFO 43 ( 0x2B) Encapsulated Interface Transport.
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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