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MODBUS over serial line Specification and Implementation Guide 20, 2006 MODBUS over serial line Specification and Implementation Guide MODBUS over serial line Specification and Implementation Guide 20, 2006 Contents 1 Introduction ........................................ ...................................... 4 Scope of this document ........................................ ..................... 4 Protocol 5 Conventions ........................................ ....................................... 5 Compliance ........................................ ........................................ 6 Glossary ........................................ ........................................ ..... 6 2 MODBUS Data Link Layer ........................................ ............... 7 MODBUS Master / Slaves protocol 7 MODBUS Addressing 8 MODBUS frame 8 Master / Slaves State 9 The two serial Transmission 12 Error Checking Methods.

MODBUS over serial line specification and implementation guide V1.02 Modbus.org Modbus.org http://www.modbus.org/ 4/44 Dec 20, 2006 1 Introduction 1.1 Scope of this document

  Guide, Serial, Specification, Implementation, Line, Over, Ombud, Specification and implementation guide, Modbus over serial line specification and implementation guide