Pymodbus

pymodbus is a full-featured, open-source Modbus protocol library implemented in Python. Modbus is a communication protocol developed by Modicon systems for transmitting information over serial lines between electronic devices.

The main features of pymodbus include:

1. Implementation of Modbus function codes: It includes a wide variety of Modbus function codes, including the most commonly used ones (like read and write operations) and some less common ones.
2. Modbus Data Model: It includes a unified data model that allows you to access and manipulate the data in a consistent way, regardless of the function code used.
3. Asynchronous and Synchronous: It provides both synchronous (blocking) and asynchronous (non-blocking) communication. The asynchronous model is based on Twisted, a framework for asynchronous network programming.
4. TCP/RTU/ASCII: It supports Modbus TCP/IP (which is Modbus over TCP/IP) as well as Modbus RTU or ASCII over serial lines.
5. Utilities: It also includes utilities for converting between different data types, such as binary, integers, and floating point numbers.
6. Examples and Documentation: It comes with plenty of examples and extensive documentation to help you get started.
7. Platform Independent: Since it’s implemented in Python, it’s platform independent and can be run on any system that supports Python.

If you’re working with devices that use the Modbus protocol, pymodbus can be a very useful tool for interfacing with those devices from a Python program.