Compatible Devices
Dometic HVAC devices [g3-airnet | Word]
Verified Devices
Dometic 0x505 device [g3-airnet | Word]
General Information
A Red Lion CAN option card (G3CN, XCCN) is mandatory when using the Dometic AirNet communications driver. [g3-airnet | Word]
HVAC Commands
HVAC Commands consist of the following components:
| **Prefix** | **Description** |
|---|---|
| HOMW | HVAC Operation Mode |
| HFMW | HVAC Fan Mode |
| HFSW | HVAC Fan Speed |
| HSTW | HVAC Setpoint Temperature |
| SHVAC | Send HVAC Command |
HOMW, HFMW, HFSW, and HSTW should be set to the desired value.
The HVAC command will not be sent until the SHVAC bit is set. [g3-airnet | Word]
- These components are write-only
- Associated tags should be configured accordingly [g3-airnet | Word]
HVAC Status Report
HVAC Status Reports include:
| **Prefix** | **Description** |
|---|---|
| HCFR | HVAC Configuration * |
| HMR | HVAC Mode |
| HSR | HVAC Status |
| HFMR | HVAC Fan Mode * |
| HFSR | HVAC Fan Speed |
| HSTR | HVAC Setpoint Temperature |
| HAMR | HVAC Ambient Temperature |
| HOTR | HVAC Outdoor Temperature |
| HFR | HVAC Faults |
| HATR | HVAC Additional Sensor Temperatures |
* Data in bits 0–3 represents data received from the device in bits 4–7. [g3-airnet | Word]
- Status reports are:
- Sent every 10 seconds
- Sent after an HVAC command as an acknowledgment [g3-airnet | Word]
- These components are read-only
Device Identification
Within device configuration, the AirNet address can be defined as:
- Unit ID → read/write communications with one device
- Group ID → write commands to multiple devices
- Broadcast → Unit ID = 0, sends to all devices [g3-airnet | Word]
⚠️ Note: If a device has a Unit ID matching a Group ID, it will respond to group commands [g3-airnet | Word]
Address Change Commands
Commands are provided to change device addressing:
- UACW → Unit Address Change
- GACW → Group Address Change
These are:
- Write-only
- Require proper tag configuration [g3-airnet | Word]
DevCtrl Function Support
Device IDs can also be changed using DevCtrl:
DEVCTRL(DEVICE, FUNCTION, DATA)
Example:
DEVCTRL(0, 1, "30")
- Changes device 0 to Unit ID 30 [g3-airnet | Word]
Silent Mode Command
- Allows enabling/disabling Silent Mode
- Works only with Unit IDs
While in Silent Mode:
- Device responds to commands
- Device does not send status updates [g3-airnet | Word]
Revision History
- 02/02/09 – Created
- 03/09/09 – HCFR & HFMR bit notation
- 06/05/09 – Device Identification note [g3-airnet | Word]
Cable Information
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