Warning

This document is not updated for ESP32C61 yet, so some of the content may not be correct.

This warning was automatically inserted due to the source file being in the add_warnings_pages list.

ESP-Modbus

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

ESP-Modbus component on GitHub

Hosted Documentation

The documentation can be found through the link below:

ESP-Modbus documentation (English)

Application Examples

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

protocols/modbus/serial/mb_slave demonstrates how to use ESP32-C61 as a Modbus serial slave device with the esp-modbus stack, enabling an external Modbus host to read and write device parameters using the Modbus protocol.
protocols/modbus/serial/mb_master demonstrates how to use the esp-modbus stack port on ESP32-C61 as a Modbus serial master device, capable of reading and writing values from slave devices in a Modbus segment.
protocols/modbus/tcp/mb_tcp_slave demonstrates the esp-modbus TCP slave stack port, allowing an external Modbus host to read and write device parameters via the Modbus protocol.
protocols/modbus/tcp/mb_tcp_master demonstrates how to use the esp-modbus stack port on ESP32-C61 as a Modbus TCP master device, capable of reading and writing values from slave devices in a Modbus network.

Please refer to the README.md documents of each specific example for details.

Protocol References

For the detailed protocol specifications, see The Modbus Organization.

Was this page helpful?

Thank you! We received your feedback.
If you have any comments, fill in Espressif Documentation Feedback Form.

We value your feedback.
Let us know how we can improve this page by filling in Espressif Documentation Feedback Form.