Because the two serial-line protocols Modbus ASCII and Modbus RTU share some common code, an intermediate base class implements the functions specific to the serial protocols. The library is organised into one class for each Modbus protocol flavour and a common base class, which applies to all Modbus protocol flavours. The libmbusmaster DLL is based on the FieldTalk Modbus Master C++ Library, a proven and industrial-strength Modbus driver implementation. The VCL classes wrap around a libmbusmaster DLL which performs the core protocol functions. The library is implemented as a VCL class library. Detailed transmission and protocol failure reporting using error codes.Transmission and connection time-out supervision.Configurable word alignment for 32-bit types (big-endian, little-endian).
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