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Duct / outdoor sensors (temperature, humidity, CO2, VOC, differential pressure) · BACnet points list
Belimo Duct and Pipe Sensors (22DTH, 22UTH, 22DTM, 22ADP) BACnet BACnet points list
Updated 28 October 2026
This family of Belimo sensors shares one BACnet MS/TP object map. AI 0-11 carry the measured values (temperature, humidity, derived absolute humidity, enthalpy and dew point, CO2, VOC, differential pressure and fan airflow), and AV objects hold offsets, output scaling limits, channel assignment, fan k-factors, device settings and the optional LCD. Only the values the particular model measures are in service; the rest show Out of Service.
This page lists 81 BACnet objects for the Belimo Duct and Pipe Sensors (22DTH, 22UTH, 22DTM, 22ADP) BACnet — 69 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Belimo’s own free documentation, linked below.
- Manufacturer
- Belimo
- Model
- Duct and Pipe Sensors (22DTH, 22UTH, 22DTM, 22ADP) BACnet
- Equipment
- Duct / outdoor sensors (temperature, humidity, CO2, VOC, differential pressure)
- Equipment type
- Thermostats, sensors & meters
- BACnet objects
- 81 (69 writable)
- Transport
- BACnet MS/TP
- Firmware
- 2.3
- Also known as
- 22DTH-..6.., 22UTH-..60X, 22DTM-..6, 22ADP-..6.., 22DTH-16M, 22DTH-56M, 22UTH-160X, 22UTH-560X, 22DTM-16, 22DTM-56, 22ADP-164, 22ADP-164L, 22ADP-56Q, 22ADP-56QB, 22ADP-564L, 22ADP-566L
BMS integration notes: Belimo Duct and Pipe Sensors (22DTH, 22UTH, 22DTM, 22ADP) BACnet
Set the MS/TP MAC address and baud rate on the RS-485 module's DIP switches, then read the AI objects the model supports. Offsets, limits and the SI/Imperial choice are configuration AVs to set once. For 22ADP fan airflow, set the fan manufacturer and k-factor first.
Minimum points to map
The short list most integrators start with — enough to run the unit from a BMS. Map more as the job needs.
| Object | Name | Why | Access |
|---|---|---|---|
| AI 0 | Value temperature | Temperature (22DTH / 22UTH / 22DTM) | Read |
| AI 1 | Value relative humidity | Relative humidity (22DTH / 22UTH) | Read |
| AI 5 | Value CO2 | CO2 (22DTM) | Read |
| AI 8 | Differential pressure 1 | Differential pressure (22ADP) | Read |
| AI 9 | Volumetric flow 1 | Fan airflow (22ADP) | Read |
| AI 4 | Value dew point | Calculated dew point (22DTH / 22UTH) | Read |
Network setup
- MS/TP only; MAC address 1-127 set in binary on DIP1 switches 1-5 plus DIP2 switches 4-5 (0 is reserved).
- Baud rate on DIP2 switches 2-3: 9600, 19200, 38400 or 76800.
- DIP2 switch 1 turns on the 120 Ω terminator; all DIP switches ship OFF.
- Device ID = AV 46 offset + MAC address.
- Unconfirmed COV (AV 47) is the COV method; there are no COV subscriptions (DS-COVU-B only).
Watch out for
- inWC offsets in AV 4/5 are written in thousandths (write 10 for 0.01 inWC).
- AV 39 altitude is always entered in metres.
- The 22ADP differential pressure range is set by DIP switches 1-3 on the sensor main board.
- Channel numbers 1 and 2 also drive the two 0-10 V outputs AOU1/AOU2.
Belimo Duct and Pipe Sensors (22DTH, 22UTH, 22DTM, 22ADP) BACnet BACnet objects
Type: AI, AO, AV, BI, BO, BV, MI/MO/MV (multi-state) · Access: Read read-only, Write writable, Command writable with a priority array.
| Description | States | |||||
|---|---|---|---|---|---|---|
| AImin | 0 | Value temperature | Measured temperature | °C / °F | Read | |
| AImin | 1 | Value relative humidity | Measured relative humidity | %RH | Read | |
| AI | 2 | Value absolute humidity | Calculated absolute humidity | g/m³ / gr/ft³ | Read | |
| AI | 3 | Value enthalpy | Calculated enthalpy | kJ/kg / BTU/lb | Read | |
| AImin | 4 | Value dew point | Calculated dew point | °C / °F | Read | |
| AImin | 5 | Value CO2 | Measured CO2 | ppm | Read | |
| AI | 6 | Value VOC | Measured VOC | % | Read | |
| AI | 7 | Value CO2 VOC Mix | Combined CO2/VOC air quality value | % | Read | |
| AImin | 8 | Differential pressure 1 | Differential pressure, sensor S1 (22ADP) | Pa / inWC | Read | |
| AImin | 9 | Volumetric flow 1 | Fan airflow from dp S1 and k-factor (22ADP) | m³/h or m³/s / cfm | Read | |
| AI | 10 | Differential pressure 2 | Differential pressure, sensor S2 (dual ADP only) | Pa / inWC | Read | |
| AI | 11 | Volumetric flow 2 | Fan airflow from dp S2 (dual ADP only) | m³/h or m³/s / cfm | Read | |
| AV | 0 | Offset temperature | Temperature offset, -3 to +3 °C | °C / °F | Write | |
| AV | 1 | Offset relative humidity | Humidity offset, -5 to +5 %RH | %RH | Write | |
| AV | 2 | Offset CO2 | CO2 offset, -150 to +150 ppm | ppm | Write | |
| AV | 3 | Offset VOC | VOC offset, -15 to +15 % | % | Write | |
| AV | 4 | Offset differential pressure 1 | dp S1 offset, -50 to +50 Pa (inWC in 1/1000) | Pa / inWC | Write | |
| AV | 5 | Offset differential pressure 2 | dp S2 offset (dual ADP only) | Pa / inWC | Write | |
| AV | 6 | Lower limit temperature | Lower limit / 0 V scaling for temperature | °C / °F | Write | |
| AV | 7 | Upper limit temperature | Upper limit / 10 V scaling for temperature | °C / °F | Write | |
| AV | 8 | Lower limit relative humidity | Lower limit / 0 V scaling for relative humidity | %RH | Write | |
| AV | 9 | Upper limit relative humidity | Upper limit / 10 V scaling for relative humidity | %RH | Write | |
| AV | 10 | Lower limit absolute humidity | Lower limit / 0 V scaling for absolute humidity | g/m³ / gr/ft³ | Write | |
| AV | 11 | Upper limit absolute humidity | Upper limit / 10 V scaling for absolute humidity | g/m³ / gr/ft³ | Write | |
| AV | 12 | Lower limit enthalpy | Lower limit / 0 V scaling for enthalpy | kJ/kg / BTU/lb | Write | |
| AV | 13 | Upper limit enthalpy | Upper limit / 10 V scaling for enthalpy | kJ/kg / BTU/lb | Write | |
| AV | 14 | Lower limit dew point | Lower limit / 0 V scaling for dew point | °C / °F | Write | |
| AV | 15 | Upper limit dew point | Upper limit / 10 V scaling for dew point | °C / °F | Write | |
| AV | 16 | Lower limit CO2 | Lower limit / 0 V scaling for CO2 | ppm | Write | |
| AV | 17 | Upper limit CO2 | Upper limit / 10 V scaling for CO2 | ppm | Write | |
| AV | 18 | Lower limit VOC | Lower limit / 0 V scaling for VOC | % | Write | |
| AV | 19 | Upper limit VOC | Upper limit / 10 V scaling for VOC | % | Write | |
| AV | 20 | Lower limit CO2 VOC Mix | Lower limit / 0 V scaling for CO2 VOC Mix | % | Write | |
| AV | 21 | Upper limit CO2 VOC Mix | Upper limit / 10 V scaling for CO2 VOC Mix | % | Write | |
| AV | 22 | Lower limit volumetric flow 1 | Lower limit for airflow 1 (printed as AI[22]) | m³/h or m³/s / cfm | Write | |
| AV | 23 | Upper limit volumetric flow 1 | Upper limit for airflow 1 (printed as AI[23]) | m³/h or m³/s / cfm | Write | |
| AV | 24 | Lower limit volumetric flow 2 | Lower limit for airflow 2, dual ADP (printed as AI[24]) | m³/h or m³/s / cfm | Write | |
| AV | 25 | Upper limit volumetric flow 2 | Upper limit for airflow 2, dual ADP (printed as AI[25]) | m³/h or m³/s / cfm | Write | |
| AV | 26 | Channel temperature | Output/LCD channel for temperature (0=unused, 1-4) | Write | ||
| AV | 27 | Channel relative humidity | Output/LCD channel for relative humidity (0=unused, 1-4) | Write | ||
| AV | 28 | Channel absolute humidity | Output/LCD channel for absolute humidity (0=unused, 1-4) | Write | ||
| AV | 29 | Channel enthalpy | Output/LCD channel for enthalpy (0=unused, 1-4) | Write | ||
| AV | 30 | Channel dew point | Output/LCD channel for dew point (0=unused, 1-4) | Write | ||
| AV | 31 | Channel CO2 | Output/LCD channel for CO2 (0=unused, 1-4) | Write | ||
| AV | 32 | Channel VOC | Output/LCD channel for VOC (0=unused, 1-4) | Write | ||
| AV | 33 | Channel CO2 VOC Mix | Output/LCD channel for CO2 VOC Mix (0=unused, 1-4) | Write | ||
| AV | 34 | Channel differential pressure 1 | Output/LCD channel for differential pressure 1 (0=unused, 1-4) | Write | ||
| AV | 35 | Channel volumetric flow 1 | Output/LCD channel for volumetric flow 1 (0=unused, 1-4) | Write | ||
| AV | 36 | Channel differential pressure 2 | Output/LCD channel for differential pressure 2 (0=unused, 1-4) | Write | ||
| AV | 37 | Channel volumetric flow 2 | Output/LCD channel for volumetric flow 2 (0=unused, 1-4) | Write | ||
| AV | 38 | Selection of the unitary system | SI or Imperial units (22ADP: set by DIP 6) | Write | 1=SI, 2=Imperial | |
| AV | 39 | Height above sea level | Installation altitude, always in metres | m | Write | |
| AV | 40 | Input k-factor volumetric flow 1 | Fan k-factor x10 for airflow 1 | Write | ||
| AV | 41 | Selection of the fan manufacturer 1 | Fan maker formula for airflow 1 | Write | 0=Rosenberg/Comefri/Gebhart/Nicotra/Ziehl-Abegg, 1=EBM-Papst/AIR-CONCEPTS, 2=Fläkt-Woods | |
| AV | 42 | Input k-factor volumetric flow 2 | Fan k-factor x10 for airflow 2 (dual ADP) | Write | ||
| AV | 43 | Selection of the fan manufacturer 2 | Fan maker formula for airflow 2 (dual ADP) | Write | 0=Rosenberg/Comefri/Gebhart/Nicotra/Ziehl-Abegg, 1=EBM-Papst/AIR-CONCEPTS, 2=Fläkt-Woods | |
| AV | 44 | Response time for volumetric flow 1 | Airflow 1 response time, 4-30 s | s | Write | |
| AV | 45 | Response time for volumetric flow 2 | Airflow 2 response time (dual ADP) | s | Write | |
| AV | 85 | Zeroing differential pressure 1 | Start zero calibration of dp S1 | Write | 0=No zeroing, 1=Start zeroing | |
| AV | 86 | Zeroing differential pressure 2 | Start zero calibration of dp S2 (dual ADP) | Write | 0=No zeroing, 1=Start zeroing | |
| AV | 46 | Offset device ID | Device ID = this offset + MAC address | Write | ||
| AV | 47 | Unconfirmed COV | Enable unsubscribed COV broadcasts | Write | 0=Disabled, 1=Enabled | |
| AV | 48 | Minimum output voltage | Minimum voltage of the 0-10 V outputs | V | Write | |
| AV | 49 | Operating hours | Operating hours counter | h | Write | |
| AV | 50 | Maintenance time | Maintenance countdown in hours | h | Write | |
| AV | 52 | Enable LCD | Turn the optional display on/off | Write | 0=Disabled, 1=Enabled | |
| AV | 53 | Brightness LCD | Display brightness | % | Write | |
| AV | 54 | Rotation LCD | Display rotation | Write | 0=0°, 1=90°, 2=180°, 3=270° | |
| AV | 55 | Enable LCD traffic light function | Colour backlight by value | Write | 0=Disabled, 1=Enabled | |
| AV | 56 | Enable symbol maintenance on LCD | Show maintenance symbol when AV 50 expires | Write | 0=Disabled, 1=Enabled | |
| AV | 57 | Enable symbol maintenance on LCD | Second maintenance-symbol object, same text as AV 56 | Write | 0=Disabled, 1=Enabled | |
| AV | 58 | Enable LCD channel 1 | Show channel 1 on the display | Write | 0=Disabled, 1=Enabled | |
| AV | 59 | Enable LCD channel 2 | Show channel 2 on the display | Write | 0=Disabled, 1=Enabled | |
| AV | 60 | Enable LCD channel 3 | Show channel 3 on the display | Write | 0=Disabled, 1=Enabled | |
| AV | 61 | Enable LCD channel 4 | Show channel 4 on the display | Write | 0=Disabled, 1=Enabled | |
| AV | 62 | Channel assignment for traffic light function | Which channel object (AV 26-35) drives the colours | Write | ||
| AV | 63 | Traffic light function color range 1 | Backlight colour for range 1 | Write | 0=Off, 1=Green, 2=Yellow, 3=Red, 4=Blue, 5=Magenta, 6=Cyan, 7=White | |
| AV | 64 | Traffic light function color range 2 | Backlight colour for range 2 | Write | 0=Off, 1=Green, 2=Yellow, 3=Red, 4=Blue, 5=Magenta, 6=Cyan, 7=White | |
| AV | 65 | Traffic light function color range 3 | Backlight colour for range 3 | Write | 0=Off, 1=Green, 2=Yellow, 3=Red, 4=Blue, 5=Magenta, 6=Cyan, 7=White | |
| AV | 66 | Setting for threshold range 1 | 2 | Threshold between colour ranges 1 and 2 | Write | ||
| AV | 67 | Setting for threshold range 2 | 3 | Threshold between colour ranges 2 and 3 | Write |
No points match these filters.
Integration notes
- The document gives no BACnet object names, only instances and descriptions; names here are the printed descriptions.
- Points not measured by a given model read Out of Service; check the datasheet for which apply.
- SI or Imperial units are chosen with AV 38; on 22ADP models DIP switch 6 sets this instead.
- AV 22-25 are printed as AI[22]-AI[25] in the document but sit in the AV limits table and are R/W.
- AV 50 appears twice in the document (deduplicated); AV 56 and AV 57 share the same text.
- Document cover says Edition 2024-03 / V4.2 although the file name says V4_1.
Check it against the live device. A points list tells you what the controller can expose; the unit in front of you may differ by firmware or installed options. Easy BACnet scans a network for BACnet IP devices from an Android phone, reads every object on the Duct and Pipe Sensors (22DTH, 22UTH, 22DTM, 22ADP) BACnet and exports what it actually has to Excel — free. New to BACnet? Start with what a BACnet points list is and what the object types mean.
Questions about the Belimo Duct and Pipe Sensors (22DTH, 22UTH, 22DTM, 22ADP) BACnet
How many BACnet points does the Belimo Duct and Pipe Sensors (22DTH, 22UTH, 22DTM, 22ADP) BACnet have?
This list has 81 BACnet objects: 12 analog inputs, 69 analog values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Belimo Duct and Pipe Sensors (22DTH, 22UTH, 22DTM, 22ADP) BACnet BACnet points are writable?
69 of the 81 objects accept a write. Points marked Command have a priority array: a write holds until it is released, so release it back to automatic when you are done.
Where is the official Belimo Duct and Pipe Sensors (22DTH, 22UTH, 22DTM, 22ADP) BACnet BACnet documentation?
The source is BACnet Interface Description, Belimo Sensors 22DTH-..6.., 22UTH-..60X, 22DTM-..6, 22ADP-..6.., revision 2024-03 / V4.2, published free by Belimo at https://www.belimo.com/mam/general-documents/system_integration/BACnet/belimo_BACnet_Interface-description_Sensors_V4_1_en-gb.pdf.
What are the minimum BACnet points to integrate the Belimo Duct and Pipe Sensors (22DTH, 22UTH, 22DTM, 22ADP) BACnet?
Start with AI 0 Value temperature (Temperature (22DTH / 22UTH / 22DTM)); AI 1 Value relative humidity (Relative humidity (22DTH / 22UTH)); AI 5 Value CO2 (CO2 (22DTM)); AI 8 Differential pressure 1 (Differential pressure (22ADP)); AI 9 Volumetric flow 1 (Fan airflow (22ADP)); AI 4 Value dew point (Calculated dew point (22DTH / 22UTH)).
How do I check these points on the real Duct and Pipe Sensors (22DTH, 22UTH, 22DTM, 22ADP) BACnet?
Scan the network with a BACnet IP browser such as Easy BACnet, open the device and compare its object list with this table. Anything missing is usually an option that isn't installed or a point that is disabled in the controller's configuration.
More Belimo BACnet points lists
- Pressure-independent control valve
Belimo 2-way EPIV V4
Belimo 2-way electronic pressure-independent valves (EPIV) version 4.2, DN 15 to 50, BACnet models EP..R2+(K)BAC.
Also known as: EPIV, EP..R2+BAC, EP..R2+KBAC, Electronic Pressure Independent Valve, 2-way EPIV DN 15-50 - Ultrasonic liquid flow sensor
Belimo 22PF Flow Sensor
Belimo 22PF-.. ultrasonic flow sensors for water and glycol pipes, interface version 4.3.0.
Also known as: 22PF, 22PF-.., Belimo ultrasonic flow sensor, Flow Sensor 22PF - 6-way pressure-independent control valve
Belimo 6-way EPIV
Belimo 6-way EPIV (EP..R-R6+BAC) used to switch and control a single coil between heating and cooling sequences.
Also known as: EP..R-R6+BAC, 6-way EPIV, 6-way characterised control valve, Belimo 6-way valve - Pressure-independent control valve with energy meter
Belimo Energy Valve V4
Belimo Energy Valve version 4, DN 15 to 50, BACnet models EV..R2+(K)BAC, EV..R2+MID and EV..R3+BAC.
Also known as: Energy Valve, EV..R2+BAC, EV..R2+KBAC, EV..R2+MID, EV..R3+BAC, Belimo Energy Valve 4 - Valve actuator (Ethernet, IoT)
Belimo IoT Valve Actuators VxM24A-LP1 / VxR24A-LP1 (BACnet IP)
Belimo IoT product range valve actuators VLM/VLR, VNM/VNR, VSM/VSR and VGM/VGR 24A-LP1 with Ethernet and BACnet IP.
Also known as: VLM24A-LP1, VLR24A-LP1, VNM24A-LP1, VNR24A-LP1, VSM24A-LP1, VSR24A-LP1, VGM24A-LP1, VGR24A-LP1, Belimo IoT Product Range - Butterfly valve actuator
Belimo PR..-BAC-.. Butterfly Valve Actuator (BACnet MS/TP)
Belimo PR rotary actuators for butterfly valves in the BACnet MS/TP version (PR..-BAC-..).
Also known as: PR..-BAC-.., Belimo PR actuator, PR BACnet - Room sensor / operating unit
Belimo Room Operating Unit 22RT-5U00
Belimo 22RT...-5U00... room operating units with virtual or ePaper touch display, measuring temperature, humidity and CO2.
Also known as: 22RT, 22RT…-5U00…, Room Operating Unit, ROU, 22RTM-5U00, Belimo room sensor BACnet - Thermal (BTU) energy meter
Belimo Thermal Energy Meter V4
Belimo Thermal Energy Meters version 4, DN 15 to 50 (22PE..-1U.., including MID-certified 22PEM models).
Also known as: TEM, Thermal Energy Meter, 22PE-1U, 22PEM-1UC, 22PE…-1U.., Belimo energy meter - VAV compact controller (actuator with flow sensor)
Belimo VAV-Compact
Belimo VAV-Compact volumetric flow controllers with the BACnet/Modbus interface (..MV-D3-MOD and ..HV24A-MOD).
Also known as: VAV-Compact MOD, ..MV-D3-MOD, ..HV24A-MOD, LMV-D3-MOD, NMV-D3-MOD, SMV-D3-MOD, LHV24A-MOD - VAV / CAV / pressure controller
Belimo VAV-Universal VRU
Belimo VAV-Universal controllers VRU-D3-BAC, VRU-M1-BAC and VRU-M1R-BAC used for VAV/CAV airflow, duct pressure and room pressure control.
Also known as: VAV-Universal, VRU-D3-BAC, VRU-M1-BAC, VRU-M1R-BAC, VRU-..-BAC
Source: BACnet Interface Description, Belimo Sensors 22DTH-..6.., 22UTH-..60X, 22DTM-..6, 22ADP-..6.. · rev. 2024-03 / V4.2. Object names, instances and units are reproduced as published; descriptions are our own.