The gateway cannot communicate with the sensor. What should I check?

Verify that the baud rate on the sensor matches 38400 as expected by the template. Also confirm correct RS-485 wiring polarity (A and B terminals) and that the Modbus slave address matches the address configured in ModbusCloud.

Humidity readings show zero or unexpected values. Why?

The humidity output may be configured to send enthalpy or dew point instead. Check the output selection register to ensure relative or absolute humidity is selected as the active output signal.

Can I use this template for both duct and outside air models?

Yes. The Belimo 22DTH (duct) and 22UTH (outside air) share the same Modbus register map. One template works for both models.

How do I calibrate the sensor remotely?

Use the offset temperature and offset humidity registers exposed in the template. Write the desired correction values through the ModbusCloud platform to apply calibration without a site visit.

Free Modbus template: Belimo Temperature and Humidity Sensor Modbus RTU

Name: Belimo Temperature and Humidity Sensor Modbus RTU
Brand: Belimo
SKU: fcc52e23-e25a-4902-88d9-c461e02933dc

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Free Modbus template: Belimo Temperature and Humidity Sensor Modbus RTU | ModbusCloud

Registers (28)

12 read / 16 write

Name	Address	Function	Type	Unit	Access
Temperature	0	FC03	int16	°C	R
Relative Humidity	1	FC03	int16	%RH	R
Absolute Humidity	2	FC03	int16	g/m3	R
Enthalpy	3	FC03	int16	kJ/kg	R
Dew Point	4	FC03	int16	°C	R
Sensor Detection	501	FC03	uint16		R
Hardware version main circuit board	502	FC03	uint16		R
Firmware version main circuit board	503	FC03	uint16		R
Hardware version RS 485 module	504	FC03	uint16		R
Firmware version RS 485 module	505	FC03	uint16		R
Operating hours counter	510	FC03	uint16	h	R
Device Detection	500	FC03	uint16		R
Offset Temperature	100	FC06	int16	°C	W
Offset Relative Humidity	101	FC06	int16	%RH	W
Lower Limit Temperature	200	FC06	int16	°C	W
Upper Limit Temperature	201	FC06	int16	°C	W
Lower Limit Relative Humidity	202	FC06	int16	%RH	W
Upper Limit Relative Humidity	203	FC06	int16	%RH	W
Lower Limit Absolute Humidity	204	FC06	int16	g/m3	W
Upper Limit Absolute Humidity	205	FC06	int16	g/m3	W
Lower Limit Enthalpy	206	FC06	int16	kJ/kg	W
Upper Limit Enthalpy	207	FC06	int16	kJ/kg	W
Lower Limit Dew Point	208	FC06	int16	°C	W
Upper Limit Dew Point	209	FC06	int16	°C	W
Selection of the Unitary System	400	FC06	uint16		W
Minimum output voltage	508	FC06	uint16	V	W
Countdown for maintenance	511	FC06	uint16	h	W
Countdown for visual inspection	512	FC06	uint16	h	W

Belimo Temperature and Humidity Sensor Modbus RTU

Overview

Key readings

Available commands

Use cases

Installation

Things to watch for

Registers (28)

Working with Modbus in your projects?

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