Simple control of Systemair vtr200b via modbus TCP (Wifi) directly to HA.
This particular project is for Systemair units with old displays featuring a wheel, as shown in this photo:
Credits to Ztaeyn I used his project as a template for this one, even for this README, lol.
With this, you can currently:
- Change operation mode (Low speed, Normal speed, High speed)
- Set the desired temperature on the VTR thermostat.
- View alarm status and filter replacement countdown.
Sources:
- Modbus codes: https://shop.systemair.com/upload/assets/MODBUS_FOR_RESIDENTIAL_D24810_USER_MANUAL_EN__A007_.PDF?91306fe4
NOTE: The addresses have an offset of -1 compared to the VTR user manual above.
My Control Panel is very simple, and the code is in this repository under the user_interface folder.
Hardware required (for my setup): A Modbus TCP converter. I use the Waveshare RS485 PoE. https://www.waveshare.com/wiki/RS485_TO_ETH_(B)
How to install this:
- Copy the packages folder to your HA installation folder and modify
configuration.yamlto include this part:
homeassistant:
packages: !include_dir_named packages
- Modify vtr200b.yaml with your working Modbus settings.
- Verify that HA configuration is OK and reboot.
- Copy my HA UI card layouts if you'd like.
How to configure RS485 PoE:
I found this video very useful for configuring RS485 PoE; it was not so straightforward, at least for me:
Wiring(green - ground, blue - B, blue/white - A):
My settings that work for my vtr200b:
