Carel humiSonic Compact
Controls and monitors Carel humiSonic Compact duct humidifier via Modbus RTU
Template for the Carel humiSonic Compact ultrasonic humidifier, connected via Modbus RTU at 9600 baud. It reads alarm states, fan speed, humidity setpoint, LED indicators, and production status, and allows remote control of the humidity setpoint and unit disable function.
- Protocol
- Modbus RTU
- Connection
- RS485, 9600 baud
- Registers
- 8, read and write
- Brand
- Carel
- Key readings
- Alarms · Fan speed · Humidity set point · Green LED · Red LED / Yellow LED · Production in progress
- Available commands
- Humidity set point · Disable
- Compatible models
- humiSonic Compact
- Last updated
Registers (8)
7 read, 2 write
| Name | Unit | Access | Address (Hidden until you enter your email) | Function (hidden) | Type (hidden) |
|---|---|---|---|---|---|
| Alarms | Read | ||||
| Fan speed | Read | ||||
| Humidity set point | % | Read and write | |||
| Green LED | Read | ||||
| Red LED | Read | ||||
| Yellow LED | Read | ||||
| Production in progress | Read | ||||
| Disable | Write |
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Use cases
- Monitor alarm states and LED indicators of multiple humiSonic Compact units from a single cloud dashboard.
- Adjust the humidity setpoint remotely when seasonal conditions change, without visiting the site.
- Create an alert when an alarm flag activates so you can respond to faults before occupants complain.
- Disable the humidifier remotely during maintenance windows or outside of operating hours.
- Track fan speed and production status over time to verify the unit is running according to schedule.
Installation
Set the Modbus slave address and baud rate (9600) directly on the humiSonic Compact unit using its local keypad or display.
Wire the RS-485 A, B, and GND terminals of the humiSonic Compact to the corresponding terminals on the ModbusCloud Gateway.
In the ModbusCloud portal, assign the gateway serial port to Modbus RTU at 9600 baud, 8N1.
Import the Carel humiSonic Compact template from the ModbusCloud template library and set the slave address to match the value configured on the device.
Verify communication by checking that live values for fan speed, humidity setpoint, and LED status appear on the dashboard.
Things to watch for
The gateway cannot communicate with the humiSonic Compact. What should I check first?
Confirm that the Modbus slave address and baud rate on the humiSonic unit match the settings in the ModbusCloud gateway configuration. Both must be set to 9600 baud. Also verify the RS-485 wiring polarity (A to A, B to B) and that GND is connected.
Do I need to enable Modbus on the humiSonic Compact, or is it active by default?
The Modbus interface address and baud rate must be configured on the unit before it will respond to polling. Refer to the Carel humiSonic Compact installation manual for the exact menu path.
Can I connect multiple humiSonic Compact units on the same RS-485 bus?
Yes. Assign each unit a unique Modbus slave address on the device itself. Then add one template instance per unit in ModbusCloud, each set to the correct address. Keep total bus cable length within RS-485 limits and add a termination resistor at the last device.
What do the red and yellow LED register values mean?
The LED registers reflect the physical LED states on the unit. A red LED typically indicates a fault or critical alarm, while a yellow LED signals a warning condition. Consult the Carel documentation for a full list of LED codes and their meanings.
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