v1.3.0

Changed

• The sendCommand function will now return a value of > 4095 (0x0FFF) if there has been an error. The upper most byte of the uint16_t response to the command is the modbus error code. This makes it much easier to differentiate error responses and no responses.

Added

• Added extra functions specifying "holding" or "input" in the function name.
• Added the ability to change the number of times to retry commands.
• Added the ability to change the command and frame timeouts.
• Added an enum for modbus error codes.
• Added a variable to store the last error code, which can be checked with getLastError() and printed with printLastError().

Fixed

• Fixed calculate of expected return size

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v1.2.0

Changed

• When dumping the buffer, wait the frame timeout time between characters instead of a set 1ms.

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v1.1.0

Added

• Added setters and getters for the enable pin, modbus command timeout, and modbus frame timeout.

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v1.0.1

Fixed

• Corrected comments on input and holding registers. Input registers are the ones that are read only; holding registers are read/write.

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v1.0.0

Added

• Added functions to read coils
• Added functions to write single and multiple coils
• Added functions to read discrete inputs
• Added functions to read holding and input registers without requiring the command type as input
• Added functions to read coils, discrete inputs, holding, and input registers into a user buffer
• Added code spell configuration

Fixed

• Fixed spelling errors

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v0.7.3: Fix printFrameHex() for debugging; new and updated examples

The SensorModbusMaster library is designed to use an Arduino as a Modbus master to communicate with a sensor/slave via the Modbus RTU communication protocol.

Changed

• Update readWriteRegister.ino example to work again with the AltSoftSerial library.

Added

• Add a new getSetAddress.ino example #30

Fixed

• Fix printFrameHex() that was broken with v0.7.0 #29

Full Changelog: v0.7.1...v0.7.3

v0.7.1

Changed

• Update examples to apply to more processors
• Implement testing of more processors
• Set the platforms/architectures supported list to "*" (all)

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v0.7.0

Changed

• Applied clang format to source and examples.
• Moved the scanRegisters example from the utils to the examples folder.
• Updated Arduino library keywords file.
• Changed the debugging functionality to not require a define.

Added

• Added Doxygen documentation comments.
• Created a documentation page using Doxygen.
• Added CI checks with Github actions using reusable workflows.

Removed

• Removed build files and documentation for custom RS-485 boards.
  This information can now be found in its own repository.

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v0.6.7: Fix debugStream null pointer

Fix by @neilh11 for a null pointer in the debugging causing crashes and other "undefined behavior."

v0.6.5: Fixed attoseconds and extra compiler warnings

Fixed attoseconds for TAI64NA time formats.

Also fixed compiler warnings when compiling with stricter -Wextra flag.