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Specification and Implementation Guide for MODBUS over ...

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.

At the physical level, MODBUS over Serial Line systems may use different physical interfaces (RS485, RS232). TIA/EIA-485 (RS485) Two-Wire interface is the most common. As an add-on option, RS485 Four-Wire interface may also be implemented. A TIA/EIA-232-

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