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Main   FieldTalk Modbus    Overview   Documentation   Evaluation   Testimonials   Platforms    Windows   Linux   QNX   Commercial Unix   Java   Delphi   Product Details    Visit our Webstore   Features   Requirements   Licensing   Support Plans   Documentation    General Description   Module Description   Class Hierarchy   Classes   Functions & Members   Modbus Background   Examples   Integration		General Description Introduction This FieldTalk™ Modbus® Master Library - Delphi Edition is library which provides connectivity to Modbus slave compatible devices and applications. It is implemented as a VCL and CLX class library. The VCL/CLX classes wrap around a libmbusmaster DLL which performs the core protocol functions. The libmbusmaster DLL is based on the FieldTalk Modbus Master Protocol C++ Edition, a proven and industrial-strength Modbus implementation. Typical applications are supervisory control systems, data concentrators and gateways, user interfaces and factory information systems. Features: Robust design suitable for real-time and industrial applications Full implementation of Class 0 and Class 1 Modbus functions as well as a subset of the most commonly used Class 2 functions Standard Modbus boolean and 16-bit integer data types Support for 32-bit integer, modulo-10000 and float data types Configurable word alignment for 32-bit types (big-endian, little-endian) Support of Broadcasting Failure and transmission counters Transmission and connection time-out supervision Detailed transmission and protocol failure reporting using error codes Multi-platform design Scalable: you can use serial protocols only or TCP/IP or all of them Customized modifications and development of add-ons available Library Structure The library is organised into one class for each Modbus master protocol flavour and a common base class, which applies to all protocol flavours. Because the two serial protocols ASCII and RTU share some common code, an intermediate base class implements the functions specific to serial protocols. The base class TMbusMasterFunctions contains all protocol unspecific functions, in particular the data and control functions defined by Modbus. All protocol flavours inherit from this base class. The class TMbusAsciiMasterProtocol implements the Modbus ASCII protocol, the class TMbusRtuMasterProtocol implements the Modbus RTU protocol and the class TMbusTcpMasterProtocol implements the MODBUS/TCP protocol. In order to use one of the three master protocols, the desired protocol flavour class has to be instantiated: TMbusRtuMasterProtocol mbusProtocol; After a protocol object has been declared and opened, data and control functions can be used: mbusProtocol.writeSingleRegister(slaveId, startRef, 1234); Overview What You should know about Modbus Some Background Technical Information The Protocol Functions How Slave Devices are identified The Register Model and Data Tables Data Encoding Register and Discrete Numbering Scheme The ASCII Protocol The RTU Protocol The MODBUS/TCP Protocol Data and Control Functions for all Protocol Flavours Serial Protocols MODBUS/TCP Protocol How to integrate the Protocol in your Application Examples Design Background License Support

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