High speed MODBUS RTU & ESP32

Q&A Forum › Category: ESP32 › High speed MODBUS RTU & ESP32

GERMAN GOMEZ asked 4 years ago

Hi,
I’m looking for a code sample, library, hardware definition about “ESP32 & MODBUS RTU RS485 protocol”, but I need baud rate communications between master-slave about 1,5 Mbit/s or more. Could anyone help me?

Question Tags: MODBUS RTU RS485 ESP32 ARDUINO IDE COMMUNICATIONS

3 Answers

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Steve Mercer answered 4 years ago

The biggest problem is that the voltage levels for RS-485 are way different than what you have on an ESP32 so you need an interfacing chip like an MAX485. This post should help out. I think 10Mb/s is max rate on an ESP32. Also I’m pretty sure the built-in serial library should work. RS-485 is in the Espressif docs.

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Sara Santos Staff answered 4 years ago

Hi.
I don’t have experience with the MODBUS protocol on the ESP32.
The resources Steve shared can be a good starting point. I also find this library compatible with the ESP32 that might be useful for your project: https://github.com/emelianov/modbus-esp8266.
I’m sorry that I can’t help much with this subject.
Regards,
Sara

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GERMAN GOMEZ answered 4 years ago

Thanks so much for the answers, …and I will inform about it and if I find a solution.