Kaldheim.org

Systemair

(Last changed 2021-02-09) — Written by Daniel Rufus Kaldheim — 1 min read
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Model: Systemair VR 400 DCV/B R

System Air ESP32 Bridge

I have built a circuit board that works with system air, checkout this repository for more information.

PCB
Schematics

Images

Make and model
Controller unit datalines
Remote controller modbus settings
Firmware version
Controller board
Oscilloscope measurements from usb to rs485 (modbus signal)
Only able to get transmitted data.

FT232 USB cable
SparkFun Transceiver Breakout - RS-485
RJ45
Pin 4 -> B (Blue -> Yellow), Pin 5 -> A (White/Blue -> Green)

Pinout RJ45

Wiring systemair

Wiring RS-485
(Note. I know A/B is switched around on this picture)

Hardware

USB to RS485

/dev/ttyACM0

Software

Airiana - SystemAir control

curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
python get-pip.py

Issues

With the two hardware setups I have, I currently do not get anything back from the device. I have opened an issue about Airiana repo, hoping to get some eye opening to get this fixed.

Airiana dump of RAM/err and RAM/out: Gist Dump