Transcription of MODBUS APPLICATION PROTOCOL …
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MODBUS APPLICATION PROTOCOL …
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 .. 15 04 (0x04) Read Input Registers .. 16 05 (0x05) Write Single Coil .. 17 06 (0x06) Write Single Register .. 19 07 (0x07) Read Exception Status (Serial Line only).
MODBUS Application Protocol Specification V1.1b3 Modbus April 26, 2012 http://www.modbus.org 2/50 1 Introduction 1.1 Scope of this document
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