Contributing / Report bugs

Contributions are welcome, and they are greatly appreciated! Every little bit helps, and credit will always be given.

Note that MinimalModbus is released very infrequently, but your issues are not forgotten. Do not use GitHub issues for problems getting the Modbus communication to your instrument to work. For that Stack Overflow is much better, see Support.

You can contribute in many ways:

Types of Contributions

Help other users

It is greatly appreciated if you can help other users to get their Modbus equipment up and running. Please subscribe (“watch”) the tags “modbus” and “minimalmodbus” on Stack Overflow.

Here are the newest minimalmodbus questions on Stack Overflow:

Report Bugs

Report bugs at

Try to isolate the bug by running in interactive mode (Python interpreter) with debug mode activated.

Of course it is appreciated if you can spend a few moments trying to locate the problem, as it might possibly be related to your particular instrument (and thus difficult to reproduce without it). The source code is very readable, so is should be straight-forward to work with.

If you are reporting a bug, please include:

  • Your operating system name and version.
  • Any details about your local setup that might be helpful in troubleshooting.
  • Detailed steps to reproduce the bug.
  • The output from _get_diagnostic_string().

Fix Bugs

Look through the GitHub issues for bugs. Anything tagged with “bug” is open to whoever wants to implement it.

Implement Features

Look through the GitHub issues for features. Anything tagged with “enhancement” is open to whoever wants to implement it.

Write Documentation

MinimalModbus could always use more documentation, whether as part of the official MinimalModbus docs, in docstrings, or even on the web in blog posts, articles, and such.

Submit Feedback

The best way to send feedback is to file an issue at

If you are proposing a feature:

  • Explain in detail how it would work.
  • Keep the scope as narrow as possible, to make it easier to implement.
  • Remember that this is a volunteer-driven project, and that contributions are welcome :)

Get Started!

Ready to contribute? Here’s how to set up minimalmodbus for local development.

  1. Fork the minimalmodbus repo on GitHub.

  2. Clone your fork locally:

    $ git clone
  3. Install your local copy into a virtualenv. Assuming you have virtualenvwrapper installed, this is how you set up your fork for local development:

    $ mkvirtualenv minimalmodbus
    $ cd minimalmodbus/
    $ python develop
  4. Create a branch for local development:

    $ git checkout -b name-of-your-bugfix-or-feature

    Now you can make your changes locally.

  5. When you’re done making changes, check that your changes pass the tests.

  6. Commit your changes and push your branch to GitHub:

    $ git add .
    $ git commit -m "Your detailed description of your changes."
    $ git push origin name-of-your-bugfix-or-feature
  7. Submit a pull request through the GitHub website.

Pull Request Guidelines

Before you submit a pull request, check that it meets these guidelines:

  1. The pull request should include tests.
  2. If the pull request adds functionality, the docs should be updated.
  3. The pull request should work for currently supported Pyhton versions. Check Github Actions to make sure that the tests pass for all supported Python versions.