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Belimo Room Operating Unit 22RT-5U00 BACnet points list
Updated 28 October 2026
The 22RT room operating unit is a wall sensor with a configurable display that measures room temperature and, depending on model, humidity and CO2. Over BACnet MS/TP it reports the measured values and lets the BMS read and write the temperature and ventilation setpoints, set the building operation mode, and control what the display shows (icons, buttons, CO2 traffic light). The occupant's local adjustments come back as the same setpoint objects.
This page lists 44 BACnet objects for the Belimo Room Operating Unit 22RT-5U00 — 37 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
- Room Operating Unit 22RT-5U00
- Equipment
- Room sensor / operating unit
- Equipment type
- Thermostats, sensors & meters
- BACnet objects
- 44 (37 writable)
- Transport
- BACnet MS/TP
- Firmware
- ROUS1 V2.2 / V3.0
- Default device instance
- 1
- Also known as
- 22RT, 22RT…-5U00…, Room Operating Unit, ROU, 22RTM-5U00, Belimo room sensor BACnet
BMS integration notes: Belimo Room Operating Unit 22RT-5U00
Read AI 1 temperature (plus AI 2 humidity and AI 3 CO2 where fitted) and use AV 110 or the relative AV 111 as the zone setpoint, which the occupant can also change locally. Use MV 118 for comfort/eco/boost/off mode and AV 15 for the ventilation setpoint. Drive the heating/cooling and warning icons from the BMS if wanted.
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 |
|---|---|---|---|
| MV 118 | OperationMode | Off / comfort / eco / boost | Write |
| AV 110 | SetpointTemperature | Zone setpoint (BMS or occupant) | Write |
| AV 15 | VentilationSetpoint | Ventilation setpoint, % (BMS or occupant) | Write |
| AI 1 | Temperature | Room temperature | Read |
| AI 2 | Relative_Humidity | Room humidity | Read |
| AI 3 | Co2Value | Room CO2 | Read |
Enable & remote start
BV 110 EnLocalAdjustment allows or blocks occupant changes to setpoints, Eco, Boost and On/Off on the unit.
Heartbeat & communication loss
AV 130 BusWatchdog, 30-3600 s (default 120 s), is for monitoring only; the document gives no fail action.
Network setup
- MS/TP: baud 9600-115200, default 38400; MAC address 0-127, default 1; max 32 nodes without repeater.
- Default device instance 1.
- 120 Ω termination is off by default and is set with the Belimo Assistant App (shown in BV 99).
- Parameterise with the Belimo Assistant App.
Watch out for
- Writable persistent objects must not be written on a regular basis; avoid cyclic writes of display and limit settings.
- Changing MV 127 changes the units of the temperature and setpoint objects.
- The occupant's setpoint range is limited by AV 112 (centre) and AV 113 (range).
- Max 5 active COV subscriptions.
Belimo Room Operating Unit 22RT-5U00 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 | 1 | Temperature | Room temperature | °C, K or °F (MV 127) | Read | |
| AImin | 2 | Relative_Humidity | Room relative humidity | %RH | Read | |
| AImin | 3 | Co2Value | Room CO2 concentration | ppm | Read | |
| AV | 12 | DewPointTemperature | Room dew point | °C, K or °F (MV 127) | Read | |
| AV | 100 | TemperatureOffset | Room temperature offset, -15 to +15 | K | Write | |
| AV | 101 | HumidityOffset | Relative humidity offset, -20 to +20 | %RH | Write | |
| AV | 102 | Co2Offset | CO2 offset, -500 to +500 | ppm | Write | |
| MV | 127 | UnitSelTemperature | Temperature unit used on the bus | Write | 1=°C, 2=K, 3=°F | |
| MV | 100 | UnitSelTemperatureDisplay | Temperature unit shown on the display | Write | 1=°C, 2=-, 3=°F | |
| MV | 128 | UnitSelDeltaT | Unit for relative setpoint AV 111 | Write | 1=°C, 2=K, 3=°F | |
| AVmin | 110 | SetpointTemperature | Room/zone temperature setpoint | °C, K or °F (MV 127) | Write | |
| AV | 111 | SetpointRelTemperature | Relative setpoint shift from default | °C, K or °F (MV 128) | Write | |
| MV | 103 | SetpointType | Absolute or relative setpoint on the display | Write | 0=Absolute setpoint, 1=Relative setpoint | |
| AV | 112 | SetpointTemperatureDefault | Centre of setpoint adjustment range (15-35) | °C | Write | |
| AV | 113 | AdjustmentRangeSetpoint | Allowed setpoint adjustment (0-5, e.g. 3 = ±3) | K | Write | |
| AVmin | 15 | VentilationSetpoint | Room/zone ventilation setpoint | % | Write | |
| MV | 10 | ManualAutomaticControlMode | Manual or automatic ventilation stages | Write | 1=Manual ventilation stages control, 2=Automatic ventilation stages control | |
| MV | 105 | VentControlMode | Ventilation control functionality | Write | 1=Manual mode only, 2=Automatic or manual | |
| MV | 106 | NumberVentilationStages | Number of ventilation stages on display | Write | 1=3 stages, 2=4 stages, 3=7 stages | |
| BV | 110 | EnLocalAdjustment | Allow occupant adjustments on the unit | Write | 0=Disabled, 1=Enabled | |
| BV | 111 | ColorScheme | Display colour scheme | Write | 0=Black on white, 1=White on black | |
| BV | 112 | ShowTemperature | Show room temperature on display | Write | 0=Invisible, 1=Visible | |
| BV | 113 | ShowRelHumidity | Show relative humidity on display | Write | 0=Invisible, 1=Visible | |
| BV | 114 | ShowCo2 | Show CO2 on display | Write | 0=Invisible, 1=Visible | |
| MV | 110 | TempDisplayMode | What the large temperature field shows | Write | 1=Invisible, 2=Display actual room temperature, 3=Room temperature setpoint | |
| BV | 115 | ShowVentilationStages | Show ventilation stages on display | Write | 0=Invisible, 1=Visible | |
| BV | 116 | ShowBoostButton | Show boost button on display | Write | 0=Invisible, 1=Visible | |
| MV | 111 | ModeEcoButton | Eco button behaviour | Write | 1=Invisible, 2=Display status, 3=Selection eco mode on/off | |
| MV | 112 | ModeOnOffButton | On/off button behaviour | Write | 1=Invisible, 2=Display status, 3=Selection on/off | |
| BV | 120 | ShowWarningIcon | Show warning icon (when MV 116 = 2) | Write | 0=Invisible, 1=Visible | |
| BV | 121 | ShowWindowIcon | Show window icon (when MV 117 = 2) | Write | 0=Invisible, 1=Visible | |
| MV | 115 | DispHeatCoolSt | Heating/cooling status icon from the BMS | Write | 1=None, 2=Heating, 3=Cooling | |
| BV | 122 | ShowHeatingCoolingIcon | Enable heating/cooling icons | Write | 0=Invisible, 1=Visible | |
| MV | 116 | WarningIconFunction | Warning icon source | Write | 1=Invisible, 2=According to display warning icon, 3=According to device error status | |
| MV | 117 | WindowIconFunction | Window icon source | Write | 1=Invisible, 2=According to display window icon, 3=According to digital input | |
| MVmin | 118 | OperationMode | Building operation mode | Write | 1=Off/protection, 2=On/comfort, 3=Eco mode, 4=Boost mode | |
| AV | 117 | BoostModeDuration | Boost mode duration (60-3600) | s | Write | |
| BI | 10 | DigitalInput | Digital input state (e.g. window contact) | Read | 0=False, 1=True | |
| AV | 130 | BusWatchdog | Bus watchdog timeout, monitoring only (default 120) | s | Write | |
| BV | 99 | BusTermination | 120 Ω bus termination enabled | Read | 0=Disabled, 1=Enabled | |
| MV | 119 | AirQualityStatus | CO2 traffic-light status | Read | 1=Deactivated, 2=Ok, 3=Warning, 4=Alarm | |
| BV | 125 | ShowAirQualityIndication | Show CO2 traffic light | Write | 0=Disabled, 1=Enabled | |
| AV | 115 | AirQualityGoodLimit | CO2 threshold green/yellow (600-1249) | ppm | Write | |
| AV | 116 | AirQualityMediumLimit | CO2 threshold yellow/red (1250-2000) | ppm | Write |
No points match these filters.
Integration notes
- Humidity, dew point and CO2 objects only apply to models with those sensors.
- MV 127 sets the bus unit of AI 1, AV 12 and AV 110; MV 100 only changes the display unit.
- MV 103 SetpointType uses state values 0 and 1 as printed in the document.
- Display objects (BV 110-125, MV 110-117) configure the screen layout and icons rather than the HVAC process.
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 Room Operating Unit 22RT-5U00 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 Room Operating Unit 22RT-5U00
How many BACnet points does the Belimo Room Operating Unit 22RT-5U00 have?
This list has 44 BACnet objects: 3 analog inputs, 13 analog values, 1 binary input, 12 binary values, 15 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Belimo Room Operating Unit 22RT-5U00 BACnet points are writable?
37 of the 44 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 Room Operating Unit 22RT-5U00 BACnet documentation?
The source is BACnet Interface Description, Room Operating Units 22RT...-5U00..., revision 2023-04 / V2.2/V3.0, published free by Belimo at https://www.belimo.com/mam/general-documents/system_integration/belimo_BACnet_Interface-description_room-sensors-am_en-us.pdf.
What are the minimum BACnet points to integrate the Belimo Room Operating Unit 22RT-5U00?
Start with MV 118 OperationMode (Off / comfort / eco / boost); AV 110 SetpointTemperature (Zone setpoint (BMS or occupant)); AV 15 VentilationSetpoint (Ventilation setpoint, % (BMS or occupant)); AI 1 Temperature (Room temperature); AI 2 Relative_Humidity (Room humidity); AI 3 Co2Value (Room CO2).
How do I enable BMS control of the Belimo Room Operating Unit 22RT-5U00?
BV 110 EnLocalAdjustment allows or blocks occupant changes to setpoints, Eco, Boost and On/Off on the unit.
Does the Belimo Room Operating Unit 22RT-5U00 need a BACnet heartbeat or have a communication timeout?
AV 130 BusWatchdog, 30-3600 s (default 120 s), is for monitoring only; the document gives no fail action.
How do I check these points on the real Room Operating Unit 22RT-5U00?
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
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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 - Duct / outdoor sensors (temperature, humidity, CO2, VOC, differential pressure)
Belimo Duct and Pipe Sensors (22DTH, 22UTH, 22DTM, 22ADP) BACnet
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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 - 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-..).
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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, Room Operating Units 22RT...-5U00... · rev. 2023-04 / V2.2/V3.0. Object names, instances and units are reproduced as published; descriptions are our own.