Release 2.0.1 (2021-08-11)

  • Improved documentation
  • Finetuned Github Actions workflow

Release 2.0.0 (2021-08-10)

New features:

  • Type hints available
  • Support for broadcast (slave address 0), by Jan Breuer.
  • Measurement of round-trip time

Breaking changes:

  • Dropping support for Python 2

Other fixes:

  • Starting to convert internal data representation as bytes (it had to be strings when supporting Python 2)
  • Converted from setup.py to setup.cfg
  • Use Github Actions instead of Travis CI

Release 1.0.2 (2019-08-11)

  • Adjusted settings for hardware tests
  • Improved developer documentation

Release 1.0.1 (2019-08-10)

  • Corrected version number

Release 1.0.0 (2019-08-10)

New features:

  • Implements reading and writing multiple bits simultaneously.
  • Support more byteorders (endianness) for floats and long integers.

Breaking changes:

  • Renamed method arguments ‘numberOfDecimals’, ‘numberOfRegisters’ to ‘number_of_decimals’, ‘number_of_registers’
  • Removed example drivers for Eurotherm 3500 and Omegacn 7500, as I no longer have access to these instruments for testing. It would great if someone would pick up support for these instruments in a separate project.
  • Requires pyserial 3.0 or later.
  • Removed module level constants for default values, as they were confusingly named.

Other fixes:

  • Allow slave addresses also in the reserved range (up to 255). Reported by GitHub user gnbl.
  • Serial port read and write buffers are cleared before each request to the instrument. Pull request from GitHub user mrrs6.
  • Check whether the serial port is open before trying to open it. Reported by Matthias Bolte.
  • Custom exceptions for Modbus errors, by Russ Garrett.
  • Silent period between messages is at least 1.75 ms to fulfill Modbus standard. Reported by GitHub user draput.
  • Use time.monotonic if available. Suggested by Matthias Bolte.
  • Implemented write timeout, to avoid hanging when writing. Instead it will raise an exception. Reported by Austin Stover.
  • Better checking of number of registers when reading and writing.
  • Rename internal methods and variables to be PEP8 compliant.
  • Improved documentation.

Release 0.7 (2015-07-30)

  • Faster CRC calculation by using a lookup table (thanks to Peter)
  • Handling of local echo (thanks to Luca Di Gregorio)
  • Improved behavior of dummy_serial (number of bytes to read)
  • Improved debug messages (thanks to Dino)
  • Using project setup by the cookie-cutter tool.
  • Reshuffled source files and documentation.
  • Moved source to GitHub from Sourceforge.
  • Moved documentation to readthedocs.org
  • Using the tox tool for testing on multiple Python versions.
  • Using Travis CI test framework
  • Using codecov.io code coverage measurement framework
  • Added support for Python 3.3 and 3.4.
  • Dropped support for Python 2.6.

Release 0.6 (2014-06-22)

  • Support for Modbus ASCII mode.

Release 0.5 (2014-03-23)

  • Precalculating number of bytes to read, in order to increase the speed.
  • Better handling of several instruments on the same serial port, especially for Windows.
  • Improved timing for better compliance with Modbus timing requirements.

Release 0.4 (2012-09-08)

  • Read and write multiple registers.
  • Read and write floating point values.
  • Read and write long integers.
  • Read and write strings.
  • Support for negative numbers.
  • Use of the Python struct module instead of own bit-tweaking internally.
  • Improved documentation.

Release 0.3.2 (2012-01-25)

  • Fine-tuned setup.py for smoother installation.
  • Improved documentation.

Release 0.3.1 (2012-01-24)

  • Improved requirements handling in setup.py
  • Adjusted MANIFEST.in not to include doc/_templates
  • Adjusted RST text formatting in README.txt

Release 0.3 (2012-01-23)

This is a major rewrite, but the API is backward compatible.

  • Extended functionality to support more Modbus function codes.
  • Option to close the serial port after each call (useful for Windows XP etc).
  • Diagnostic string output available (for support).
  • Debug mode available.
  • Improved __repr__ for Instrument instances.
  • Improved Python3 compatibility.
  • Improved validity checking for function arguments.
  • The error messages are made more informative.
  • The new example driver omegacn7500 is included.
  • Unit tests included in the distribution.
  • A dummy serial port for unit testing is provided (including recorded communication data).
  • Updated documentation.

Release 0.2 (2011-08-19)

  • Changes in how to reference the serial port.
  • Updated documentation.

Release 0.1 (2011-06-16)

  • First public release.