vcontrold am Home Assistant OS mit Viessmann WO1C – keine Verbindung über Optolink (CP2102)

[4rmct5zhf4-maker]

Hi everyone,

I’m trying to connect my Viessmann WO1C heat pump directly to Home Assistant OS using the Vcontrol add-on (vcontrold).
My goal is very simple: I just want to test if communication works – e.g. read one value like the outdoor temperature.

Unfortunately, I get no response or timeout from the heater. Maybe someone with a WO1C or Vitocal setup can help me figure this out.

My setup

Heating system: Viessmann WO1C (heat pump)

Interface: Original Viessmann Optolink cable (from Vitoconnect 100)

Chipset: CP2102 USB-to-UART Bridge Controller

Recognized as:

/dev/ttyUSB0
/dev/serial/by-id/usb-Silicon_Labs_CP2102_USB_to_UART_Bridge_Controller_0001-if00-port0

System: Home Assistant OS (latest version)

Add-on: Vcontrol (vcontrold) by Alexandre-io

Goal: Just test if the heater responds to one read command (getTempA)

Current add-on configuration (YAML)

tty: /dev/ttyUSB0
refresh: 30
device_id: "0x20"
mqtt_topic: openv
debug: false
commands:

vcontrold.xml
<?xml version="1.0" encoding="UTF-8"?>
<V-Control>
<config>
<tty>/dev/serial/by-id/usb-Silicon_Labs_CP2102_USB_to_UART_Bridge_Controller_ 0001-if00-port0</tty> 4800
<parity>even</parity> 1
`

<net> 3002
<allow ip='127.0.0.1'/>

<logging> y
`

<device ID="204D"/>
`

<extern xmlns:xi="http://www.w3.org/2003/XInclude"> <xi:include href="vito.xml" parse="xml"/>
</extern> `

Questions

Which address (e.g. 0x20, 0x42, 0x10) works for the WO1C or similar Viessmann heat pumps?

Do I maybe need to use the P300 protocol instead of KW for this device?

Does anyone have a working vcontrold.xml / vito.xml for WO1C?

On Home Assistant OS, do I need to enable any special USB permissions or udev rules for the add-on to access /dev/ttyUSB0?

Is there any way to confirm that the heater even responds (for example a SYNC signal in the log)?
`

The CP2102 adapter is detected and accessible,
but vcontrold never receives any data from the heater.
I just want to verify that basic communication works (one value, e.g. outdoor temperature) before setting up MQTT and automations.

Any advice or working configs from others with a Viessmann WO1C or Vitocal system would be greatly appreciated! 🙏
Thanks in advance,