Specification and Implementation Guide for MODBUS over ...

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 .. 19 3 Physical 20 20 Data Signaling Rates .. 20 Electrical 21 Multipoint System 27 Mechanical Interfaces.

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 ...

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