ESP-Modbus

[中文]

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 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 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 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.

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