DucoBox Focus

Use cases

• Monitor CO2 and relative humidity levels per room on a live dashboard for your customer.
• Set ventilation positions remotely for the box and individual valves without on-site visits.
• Create an alert when indoor CO2 exceeds a threshold for more than five minutes.
• Track airflow rates versus target levels to verify correct system balancing after commissioning.
• Log remaining time in each ventilation mode to analyze usage patterns over weeks or months.
• Combine ventilation data with other building systems on a single ModbusCloud dashboard for facility management.

Installation

1. 1Ensure the DucoBox Focus is equipped with a Duco connectivity board and connected to the local network via Ethernet.
2. 2Enable Modbus TCP on the DucoBox Focus connectivity board and note the unit's IP address and TCP port.
3. 3Connect your ModbusCloud gateway (MCG or MLP series) to the same local network as the DucoBox Focus.
4. 4Import the DucoBox Focus template from the ModbusCloud template library into your project.
5. 5Assign the correct IP address and port of the DucoBox Focus in the gateway configuration.
6. 6Verify live data appears on the ModbusCloud dashboard and confirm read and write operations on a ventilation position register.

Things to watch for

01

Why do read and write operations use the same Modbus address?

The DucoBox Focus API v2.5 maps ventilation position registers to shared addresses for reading and writing, for example address 100 for node 1. This is by design. The template handles this automatically.

02

Do I need a specific firmware version on the connectivity board?

The template is based on API v2.5. Make sure your connectivity board firmware supports this API version or later. Check the Duco support portal for firmware updates if registers do not respond as expected.

03

What TCP port does the DucoBox Focus use for Modbus?

The default port is documented in the Duco Modbus manual. Verify the port setting in the connectivity board configuration interface before configuring the gateway.

04

Can I control valves that are not connected or not present in my installation?

Writing to a node address for a valve that is not physically connected will have no effect. Only configure the nodes that match your actual installation to avoid confusion in the dashboard.

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