glynhudson/samsung-modbus-mim-b19n

MIM module query

Opened this issue · 4 comments

rand12345 commented

Hi,

I have been asked to create a standalone embedded controller which uses the MIM-B19N to control a Samsung outdoor unit. Using the registers provided in your repo everything is working well. The second stage of this project is to operate the outdoor unit without the Samsung communications module as seen here.

So my question is this, do you have this module in your installation, and do you know whether it is optional once the MIM is connected?

glynhudson commented

I've only got experience using modbus via MIM-B19N. I would be interested to learn if direct communication is possible and what format this would be in.

I'm aware that Samsung makes their own MIM-CO2N USB dongle for diagnostics using Samsung S-Pro which can be connected directly to F1 & F2, I think this dongle is just a RS485 adaptor.

It would be great to be able to control and monitor the unit without the MIM-B19N, also Samsung heat pumps really need a proper Home Assistant integration since the current HA Smart Things integration does not work with Samsung heat pumps.

nejcmedved commented

Hey,

I would also be interested if there is a possibility to communicate through F1 & F2. Is there any update on that ? :)

Do you think on F1 & F2 is 485? Is there any idea what baud rate and what protocol it runs?

best, Nejc

rokgerzelj commented

@nejcmedved There is some work done here: esphome_samsung_ac. The protocol used to communicate on F1 & F2 seems to be https://wiki.myehs.eu/wiki/NASA_Protocol and it is indeed RS-485 with 9600 baud rate.

I'm also interested, there is a new R290 unit variant that doesn't require an indoor unit at all, and it would be great if it were possible to replace the default samsung controller with something more hackable.

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Siftah commented

Same here, would be very interested in being able to have a more direct control of the Samsung heat pump via Home Assistant!