Esp32 with modbus Rs485

[aymandab1]

Hello all, I need help. I have a Modbus RS485 sensor and I want to read its value from an ESP32. I have searched a lot for codes and libraries, such as SoftwareSerial and ModbusMaster. If anyone can help me and provide a code for reading data from the Modbus sensor using an ESP32, I would greatly appreciate it.

Baudrate: 9600
Function: read holding registers x4
9 bits
Id : 1

[aymandab1]

I am using MAX485, any help?

[pedrominatel]

Hi,

I'm not sure about Modbus libs for Arduino, however, you can use ESP-IDF code on Arduino.
Please take a look at the ESP-IDF examples here: Modbus Serial.

[bertmelis]

https://github.com/eModbus/eModbus

Mind that there might be some quirks when using a simple max485.