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MODBUS MESSAGING ON TCP/IP IMPLEMENTATION GUIDE …

MODBUS MESSAGING on TCP/IP IMPLEMENTATION GUIDE MODBUS Organization October 24, 2006 MESSAGING ON TCP/IP IMPLEMENTATION GUIDE CONTENTS 1 INTRODUCTION .. 2 OBJECTIVES .. 2 CLIENT / SERVER 2 REFERENCE DOCUMENTS .. 3 2 ABBREVIATIONS .. 3 3 CONTEXT .. 3 PROTOCOL DESCRIPTION .. 3 General communication architecture .. 3 MODBUS On TCP/IP Application Data Unit .. 4 MBAP Header description .. 5 MODBUS FUNCTIONS CODES DESCRIPTION .. 6 4 FUNCTIONAL 7 MODBUS COMPONENT ARCHITECTURE 7 TCP CONNECTION MANAGEMENT ..10 Connections management Impact of Operating Modes on the TCP Access Control Module ..14 USE of TCP/IP STACK ..14 Use of BSD Socket interface.

Specification, although an example is described in the implementation model. ¾MODBUS Server. On reception of a MODBUS request this module activates a local action to read, to write or to achieve some other actions. The processing of these actions is done totally transparently for the application programmer. The main MODBUS server functions are

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