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MODBUS over serial line Specification and Implementation Guide 1/44 12/02/02 MODBUS over serial Line Specification & Implementation Guide MODBUS over serial line Specification and Implementation Guide 2/44 12/02/02 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 V1.0 MODBUS.ORG Modbus.org http://www.modbus.org/ 4/44
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