esp-idf/docs/en/api-reference/protocols/modbus.rst

ESP-Modbus
==========

The Espressif ESP-Modbus Library (esp-modbus) supports Modbus communication in the networks based on RS485, Wi-Fi, Ethernet interfaces.
The ESP-IDF component `freemodbus` has been moved from ESP-IDF since version v5.0 to a separate repository:

* `ESP-Modbus component on GitHub <https://github.com/espressif/esp-modbus>`__

Hosted Documentation
--------------------

The documentation can be found on the link below:

* `ESP-Modbus documentation (English) <https://docs.espressif.com/projects/esp-modbus>`__

Application Example
-------------------

The examples below demonstrate the ESP-Modbus library of serial, TCP ports for slave and master implementations accordingly.

- :example:`protocols/modbus/serial/mb_slave`
- :example:`protocols/modbus/serial/mb_master`
- :example:`protocols/modbus/tcp/mb_tcp_slave`
- :example:`protocols/modbus/tcp/mb_tcp_master`

Please refer to the specific example README.md for details.

Protocol References
-------------------

    -  ``https://modbus.org/specs.php``: Modbus Organization with protocol specifications.