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63 lines
3.8 KiB
Markdown
63 lines
3.8 KiB
Markdown
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# ESP-Modbus Library
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## Overview
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An Espressif ESP-Modbus Library (esp-modbus) is a library to support Modbus communication in the networks based on RS485, WiFi, Ethernet interfaces. The Modbus is a data communications protocol originally published by Modicon (now Schneider Electric) in 1979 for use with its programmable logic controllers (PLCs).
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* [ESP-Modbus component on GitHub](https://www.github.com/espressif/esp-modbus)
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This library is to be used with Espressif’s IoT Development Framework, [ESP_IDF](https://github.com/espressif/esp-idf). The packages from this repository are uploaded to Espressif’s component repository.
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* [esp-modbus component in component repository](https://components.espressif.com/component/espressif/esp-modbus)
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You can add the component to your project via `idf.py add-dependency`. More information about idf-component-manager can be found in [Espressif API guide](https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-guides/tools/idf-component-manager.html) or [PyPi registry](https://pypi.org/project/idf-component-manager).
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The ESP-Modbus library can be used with ESP-IDF v4.1 and later. ESP-IDF v4.x releases include an earlier version of ESP-Modbus library inside freemodbus component. To use ESP-Modbus with these releases, users need to exclude the built-in freemodbus component from the build process, and update application components to depend on esp-modbus component instead. To exclude freemodbus component from compilation, add the following line to the project CMakeLists.txt file:
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```
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set(EXCLUDE_COMPONENTS freemodbus)
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```
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ESP-IDF v5.x and later releases do not include freemodbus component, so no extra steps are necessary when adding esp-modbus component.
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## Documentation
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The documentation can be found on the link below:
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* [ESP-Modbus documentation (English)](https://docs.espressif.com/projects/esp-modbus)
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## Application Examples
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The examples below demonstrate the ESP-Modbus library of serial, TCP ports for slave and master implementations accordingly.
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- [Modbus serial slave example](https://github.com/espressif/esp-idf/tree/master/examples/protocols/modbus/serial/mb_slave)
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- [Modbus serial master example](https://github.com/espressif/esp-idf/tree/master/examples/protocols/modbus/serial/mb_master)
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- [Modbus TCP master example](https://github.com/espressif/esp-idf/tree/master/examples/protocols/modbus/tcp/mb_tcp_master)
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- [Modbus TCP slave example](https://github.com/espressif/esp-idf/tree/master/examples/protocols/modbus/tcp/mb_tcp_slave)
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Please refer to the specific example README.md for details.
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## Protocol References
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- [Modbus Organization with protocol specifications](https://modbus.org/specs.php)
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## Contributing
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We welcome contributions to this project in the form of bug reports, feature requests and pull requests.
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Issue reports and feature requests can be submitted using Github Issues: https://github.com/espressif/esp-modbus/issues. Please check if the issue has already been reported before opening a new one.
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Contributions in the form of pull requests should follow ESP-IDF project's [contribution guidelines](https://docs.espressif.com/projects/esp-idf/en/latest/esp32/contribute/index.html). We kindly ask developers to start a discussion on an issue before proposing large changes to the project.
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## Licence
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ESP-Modbus project is based on [FreeMODBUS library](https://github.com/cwalter-at/freemodbus), Copyright (c) 2006 Christian Walter and licensed under the BSD 3-clause license.
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Modbus Master related code is Copyright (c) 2013 Armink and licensed under BSD 3-clause license.
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All original code in this repository is Copyright (c) 2016-2022 Espressif Systems (Shanghai) Co. Ltd.
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The project is distributed under Apache 2.0 license. See the accompanying [LICENSE file](https://github.com/espressif/esp-modbus/blob/master/LICENSE) for a copy.
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