Vent-Axia Sentinel Econiq – Modbus / RS485 integration

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Hi all,

I’m currently integrating a Vent-Axia Sentinel Econiq MVHR unit with Home Assistant and thought I’d share some information that might help others looking to do the same.

Unlike the older Sentinel Kinetic units that people have been reverse-engineering, the Econiq appears to support Modbus RTU over the BMS RS485 port .

Vent-Axia technical support kindly provided the communication parameters and register map for the Econiq/Apex platform.

Communication settings

Protocol: Modbus RTU
Interface: RS485 (BMS port)
Slave ID: 2 (default)
Baud rate: 115200
Parity: None
Stop bits: 1

Some useful input registers

30014 – Supply fan RPM
30015 – Supply airflow (l/s)
30016 – Extract fan RPM
30017 – Extract airflow (l/s)

30010 – System power (W)

30100 – Intake duct temperature (°C ×10)
30110 – Supply duct temperature (°C ×10)
30120 – Extract duct temperature (°C ×10)
30130 – Exhaust duct temperature (°C ×10)

30101 – Intake RH (%)
30121 – Extract RH (%)

30200 – Zone temperature
30201 – Zone RH
30202 – Zone CO₂

Control registers

40030 – User override / boost command
Example: 0x030F = Boost mode for 15 minutes

40021 – Bypass override
0 = auto
1 = open
2 = closed

Hardware connection

The BMS port uses RS485. Pins normally used are:

3 – Modbus A
4 – Modbus B
5 – GND
6 – Shield

I’m planning to connect this to Home Assistant using a USB-RS485 adapter and the Modbus integration.

If anyone else is running an Econiq or Apex system and interested in collaborating on a proper Home Assistant integration or ESPHome component, it would be great to compare notes.

Happy to share more details if useful.

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I don’t have your device, just a comment here. If you use USB adapter and connect it directly to HA, the work flow is completely different than esphome approach.

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yes ive just realised this is probaby in the wrong subforum

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Ah this is awesome. I’m thinking I could use a waveshare modbus to Ethernet adaptor - same as I’ve done with my solar inverter. Have you managed to get this connected and into home assistant already @Faisy ?

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Yes pal, I got the ew11 rs485 to wifi module.

I’ve managed to get it into homeassistant partially. Need to add all the sensors still.

I’ve managed to get control of the manual override for presets along with a duration.

I’ve just seen on HACs someone has done a custom integration for a Komfovent mvhr, I think something similar should be done for vent axia if possible taking inspiration from the komfovent custom integration.

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Hi,

Did you manage to create a working integration in the end?

I’ve been looking through the user manual and noticed that it mentions the possibility of configuring virtual inputs, which can then be controlled via holding registers. However, I couldn’t find where these virtual inputs are actually set up in the mobile app.

Have you by any chance figured this out? Any guidance would be much appreciated.

Thanks!