pvyleta
commented
2 weeks ago Hello @christiaanderidder, I am happy the config files were of some use to you! The command:
EbusMessage('FanMode', 'parameterDescriptionFanMode',0x40a3, 0x01, 'w', [Field('', 'UCH', 1, 1.0, '0=Holiday;1=Reduced;2=Normal;3=High', ''), Field('', 'IGN:2', 2, 1.0, '', '')]),is something I have manually reverse-engineered from commands my Air Controlwas sending, but I was not able to make it work when trying to send with my ebusd adapter (hence I commented it out).
I think there was some special password-ish message at the end (or timestamp?) that seemed like a random giberish, that the air control sent, and without it, my HRU (Sky 300) simply did not accept it at all. Basically I was able to decipher only the flow, but not rest of the meaning of the message.
What I wanted to do, but in the end did not have time for, is to rapidly change flow rate on my air control, to get sufficient number of the 40 A3 messages, to try to decipher the meaning of the last byte (I think it was a last byt, not 100% sure). My hunch was, that the value could have been number of seconds since the last 40 A3 message or something like that.
Out of curiosity - what HRU do you have, and what is your SW version?
christiaanderidder
Hi!
First of all I would like to thank you for publishing these configuration files, as they helped me a lot getting ebusd configured for my Brink HRU unit.
While doing so I noticed that my setup is slightly different from the config files. For example, I had to read the CO2 sensor values separately from another ebus circuit instead of getting them from the HRU itself. (see my comment in https://github.com/pvyleta/ebusd-brink-hru/issues/3#issuecomment-2212419678).
I also ran into some issues with the FanMode. For my setup, reading the value seems to work fine, but writing a value seems to have no effect. Both FanMode
40 A1and FanModeAlternative40 CB - 01 01do nothing, even with the Air control panel disconnected.When the Air control panel is connected, I do see it spamming
40 A1withFF FF FF 00 00. My guess is that this is related to CO2 demand mode.When changing the speed using the physical switch or using the Air control panel, I do see a lot of activity on
40 A3. I noticed that you code had a reference to this too at https://github.com/pvyleta/ebusd-brink-hru/blob/main/src/ebus_message.py#L134-L145 . I also had a look at the service tool .NET code but could not find any additional references to this address.My first suspicion is that it has something to do with CO2 demand mode and it being overridden by a set fan speed.
I am using the following config to monitor the commands:
I was also wondering how it ended up in the python code above and why it was commented out in the end.
I would happily help out deciphering the meaning of these commands, as I can easily trigger them on my system.