DucoBox Silent Connect

Use cases

• Monitor indoor CO2 and relative humidity levels on a live dashboard to verify ventilation performance.
• Adjust the ventilation position setpoint remotely when occupancy or usage patterns change.
• Create an alert when CO2 concentration exceeds a threshold for more than 15 minutes.
• Log flow rate and ventilation status over time to identify under-ventilation in residential projects.
• Verify remaining time in the current ventilation mode after a manual override by the occupant.
• Compare actual flow rate against the target level to detect ductwork issues or filter blockage.

Installation

1. 1Ensure the DucoBox Silent Connect is equipped with a connectivity board that supports Modbus TCP.
2. 2Connect the ModbusCloud gateway (MCG or MLP series) to the same local network as the DucoBox connectivity board.
3. 3Configure the IP address of the DucoBox connectivity board in the ModbusCloud gateway settings and set the correct Modbus TCP port.
4. 4Import the DucoBox Silent Connect template (API v2.5) in the ModbusCloud platform and assign it to the gateway.
5. 5Verify that readings such as CO2, RH, ventilation status and flow rate appear on the dashboard after the first polling cycle.
6. 6Test the ventilation position write register by sending a setpoint change from the dashboard and confirming the unit responds.

Things to watch for

01

The gateway cannot connect to the DucoBox over Modbus TCP. What should I check?

Verify that the connectivity board is installed and powered. Confirm the IP address and TCP port are correct in the gateway configuration. Make sure both devices are on the same network or VLAN.

02

Do I need a specific firmware version on the DucoBox Silent Connect?

This template is based on API v2.5. Ensure your DucoBox connectivity board firmware supports API v2.5 or later. Refer to the Duco Modbus documentation for firmware compatibility details.

03

The CO2 and RH readings show zero or unexpected values. Why?

Check whether the corresponding sensors are physically connected to the DucoBox. If no CO2 sensor is installed, the register will return a default or zero value. Also verify that the sensors are configured in the DucoBox setup menu.

04

Can I control multiple DucoBox units from one gateway?

Yes. Add a separate device entry in ModbusCloud for each DucoBox, each with its own IP address. Apply the same template to each device. The gateway will poll them independently.

Registers (6)

6 read / 1 write

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