Siber Modbus Connect

Use cases

• Monitor insufflation and extraction airflow rates on a live dashboard to verify balanced ventilation performance.
• Create an alert when the filter message register signals that maintenance is required on the ventilation unit.
• Remotely adjust preset airflow values for different occupancy scenarios without visiting the installation site.
• Track atmospheric and home temperatures over time to evaluate ventilation system impact on indoor climate.
• Set up an automatic notification when an error code appears, enabling faster troubleshooting for your customer.
• Control the bypass valve remotely to optimize free cooling during favorable outdoor temperature conditions.

Installation

1. 1Connect the Siber Modbus Connect module to the Siber ventilation unit via the I2C interface, ensuring the ventilation product supports I2C communication.
2. 2Wire the RS485 A and B terminals of the Siber Modbus Connect to the corresponding RS485 terminals on the ModbusCloud gateway (MCG or MLP series).
3. 3Configure the Modbus RTU settings on the gateway to 9600 baud, odd parity (1), and set the correct slave address matching the Siber Modbus Connect unit.
4. 4Import the Siber Modbus Connect template from the ModbusCloud template library and assign it to the configured gateway connection.
5. 5Verify communication by checking that airflow, temperature, and pressure readings appear correctly on the ModbusCloud dashboard.
6. 6Remember that register addresses are offset by 1 from the Siber documentation labels, so confirm register mapping if adding custom data points.

Things to watch for

01

Why am I not getting any data from the Siber Modbus Connect?

Verify that the connected Siber ventilation unit supports I2C communication. The Modbus Connect module only converts I2C signals to Modbus RTU, so devices without an I2C interface will not respond.

02

The register values do not match what I expect from the Siber documentation. What is wrong?

Register addresses on the Siber Modbus Connect are offset by 1. For example, register 4013 in the documentation corresponds to Modbus address 4012. Adjust your configuration accordingly.

03

What baud rate and parity settings should I use?

The Siber Modbus Connect uses 9600 baud with odd parity. Make sure these settings match on both the gateway and the device to establish stable communication.

04

Can I connect multiple Siber Modbus Connect modules on the same RS485 bus?

Yes, as long as each module has a unique Modbus slave address. Ensure proper RS485 bus termination and correct wiring to avoid communication conflicts.

Registers (18)

14 read / 5 write

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