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 Example

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

• protocols/modbus/serial/mb_master

• protocols/modbus/tcp/mb_tcp_slave

• protocols/modbus/tcp/mb_tcp_master

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

Protocol References

• For the detailed protocol specifications, see The Modbus Organization.