Need help for Modbus Interface

[Ritesh]

Hello ESP32 SDK Developers,

We are planning to use Modbus for ESP32 with below requirements.

- Modbus Master
- Modbus Slave
- Modbus over RS485
- Modbus over Ethernet

So, We have checked few links over ESP32 community and found that ESP32 is giving modbus master and slave support for that so that user can use it easily and can develop application as per his requirement

https://docs.espressif.com/projects/esp ... odbus.html
https://github.com/espressif/esp-idf/tr ... dbus_slave
https://github.com/espressif/esp-idf/tr ... bus_master
https://www.instructables.com/id/ESP32- ... aster-TCP/
viewtopic.php?t=9051
https://github.com/espressif/esp-idf/bl ... modbus.rst
https://iiot-shop.com/news/esp32-modbus-master-tcp/
https://www.nabto.com/modbus-guestblog/
https://www.hackster.io/techbase_group/ ... ter-5a0f8e
https://github.com/topics/modbus-master
https://www.esp32.com/viewtopic.php?t=8111

So, i have one question like will it be implemented as generic or it will be specifically used into ESP32? Because we have also requirement to use modbus as common library for other ARM based targets.

Please let me know your feedback as per our requirement.

[Ritesh]

Hello ESP32 SDK developers,

Would you please check above requirements and let me know feedback from same.

I am still waiting for your valuable feedback regarding same.

[Ritesh]

Hello ESP_Sprite, ESP_Angus, Wifive

Still waiting feedback for same as per queries asked into earlier thread.

[ESP_alisitsyn]

Hello Ritesh,

Thank you for your question! I apologize for the delay with answer.
Current release of ESP-IDF supports Modbus Serial Master/Slave + RS485.
The implementation uses Freemodbus stack architecture with the customized common interface layer specific for ESP-IDF and port layer for ESP32. This realization is specific and Espressif is not going to make it as generic but customers can update port layer and common interface layer to use it with other CPUs and framework. Also there are plans to add Modbus TCP support using this common interface layer APIs.

Let me know if you have any other questions.

--

Alex

[Ritesh]

Hello Ritesh,

Thank you for your question! I apologize for the delay with answer.
Current release of ESP-IDF supports Modbus Serial Master/Slave + RS485.
The implementation uses Freemodbus stack architecture with the customized common interface layer specific for ESP-IDF and port layer for ESP32. This realization is specific and Espressif is not going to make it as generic but customers can update port layer and common interface layer to use it with other CPUs and framework. Also there are plans to add Modbus TCP support using this common interface layer APIs.

Let me know if you have any other questions.

--

Alex

Hello Alex,

Thanks for your Valuable feedback regarding same.

Would you please let us know like when you have plan to add Modbus TCP support using this common interface layer APIs?

Can i get any use-case examples with existing implementation of Modbus Master and Slave?

[ESP_alisitsyn]

Hello Ritesh,

Unfortunately I can not give you concrete date of release which will contain the Modbus TCP Master/Slave implementation. I will work part of time with it and possibly it will be implemented in ESP-IDF v4.1.

The use-case examples to realize small process control system with serial master and slave can be found in the example folders of esp-idf from v3.3: \esp-idf\examples\protocols\modbus_master\ (modbus_slave). This implementation has been tested with ESP development boards as well as with existing control devices (sensors and IO boards) with Modbus protocol.

Thanks.

--
Alex

[Ritesh]

Hello Ritesh,

Unfortunately I can not give you concrete date of release which will contain the Modbus TCP Master/Slave implementation. I will work part of time with it and possibly it will be implemented in ESP-IDF v4.1.

The use-case examples to realize small process control system with serial master and slave can be found in the example folders of esp-idf from v3.3: \esp-idf\examples\protocols\modbus_master\ (modbus_slave). This implementation has been tested with ESP development boards as well as with existing control devices (sensors and IO boards) with Modbus protocol.

Thanks.

--
Alex

Thanks Alex for your kind response.