Transcription of MODBUS APPLICATION PROTOCOL SPECIFICATION …
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MODBUS APPLICATION PROTOCOL SPECIFICATION …
MODBUS -IDA December 28, 2006 1/51 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 ..6 MODBUS Data model ..6 MODBUS Addressing model ..7 Define MODBUS 5 Function Code Categories ..10 Public Function Code Definition ..11 6 Function codes descriptions ..12 01 (0x01) Read Coils ..12 02 (0x02) Read Discrete 03 (0x03) Read Holding Registers ..15 04 (0x04) Read Input Registers ..16 05 (0x05) Write Single Coil ..17 06 (0x06) Write Single Register.
MODBUS Application Protocol Specification V1.1b Modbus-IDA December 28, 2006 http://www.Modbus-IDA.org 3/51 IP Internet Protocol MAC Medium Access Control MB MODBUS Protocol
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