RecieveEnable\DriverEnable output for MAX485 compatibility about esphome_samsung_ac HOT 6 CLOSED

Hi @failMode isnt there a way to use the esphome configuration to trigger that?

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Thank you for the suggestion @lanwin, I hadn't thought of that. I've done some fiddling:
First thought was to try to commandeer the UART debug function, but the earliest it will execute a sequence is after the first byte is sent (which is obviously too late). ChatGPT suggests using a UART on_data: function but I tested that and doesn't exist so the AI is hallucinating.

In short, I'm all ears if you can suggest another way to do it! :D A flow control pin on this component though, like on the esphome modbus component would be awesome.

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Can you please first try to get help on ESPHomes discord for that? I am sure that this should be possible without building it into this project.

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Did you got any answers there?

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Bumping that topic. I'm going to use a ST485EBDR already present in my device, I have two pins connected to the same GPIO:

If GPIO is low: reciver is enabled, transmitter is disabled (high resistance for the bus)
If GPI is hig: reciver is disabled, transmitter is enabled (low resistance)

When I programmed the device using esp-idf (no esperience with esp-home) i simply set =1 the TransmitEnable pin, than i revert to 0 after the command has been sent.

Now, trying to setup uart zone i can't find a settings for this behaviour.

@lanwin is the uart settings standard for espHome so i must go there to have infos?

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@lanwin I'm so sorry, I didn't see your second reply. I did end up on the home assistant discord and spent a lot of time working through using the modbus component and the uart debug flag but didn't get good results. I did end up grabbing the suggested hardware of an M5 Stack and the RS485 hat which works fantastically - basically any RS485 breakout board with auto flow control will do the job, it's just that the 'cheaper' UART->RS485 breakouts do rely on an extra input (high or low on TX) to handle the flow control. I'll take some time to try to code that feature with a pull request unless someone else beats me to it... Thank you for such a great, clean project!

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