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MODBUS APPLICATION PROTOCOL SPECIFICATION V1

April 26, 2012 1/50 MODBUS APPLICATION PROTOCOL SPECIFICATION CONTENTS 1 Introduction .. 2 Scope of this document .. 2 2 Abbreviations .. 2 3 Context .. 3 4 General description .. 3 PROTOCOL description .. 3 Data Encoding .. 5 MODBUS Data model .. 6 MODBUS Addressing model .. 7 Define MODBUS Transaction .. 8 5 Function Code Categories .. 10 Public Function Code Definition .. 11 6 Function codes descriptions .. 11 01 (0x01) Read Coils .. 11 02 (0x02) Read Discrete Inputs .. 12 03 (0x03) Read Holding registers .

It’s obvious that all the data handled via MODBUS (bits, registers) must be located in device application memory. But physical address in memory should not be confused with data reference. The only requirement is to link data reference with physical address.

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