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Belimo VAV-Universal VRU BACnet points list
Updated 28 October 2026
The VAV-Universal VRU is a damper controller with an integrated differential pressure sensor that is paired with a separate actuator. The damper manufacturer selects the application (flow control, pressure control, room pressure control or flow measurement), and the AO 1 setpoint is interpreted to match. Over BACnet MS/TP it reports airflow, differential pressure, position and status, and accepts setpoint, limits and override commands.
This page lists 38 BACnet objects for the Belimo VAV-Universal VRU — 12 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
- VAV-Universal VRU
- Equipment
- VAV / CAV / pressure controller
- Equipment type
- VAV boxes & fan coils
- BACnet objects
- 38 (12 writable)
- Transport
- BACnet MS/TP
- Firmware
- Application 01.04.0006, firmware 14.10.0002
- Default device instance
- 1
- Also known as
- VAV-Universal, VRU-D3-BAC, VRU-M1-BAC, VRU-M1R-BAC, VRU-..-BAC
BMS integration notes: Belimo VAV-Universal VRU
SpSource defaults to Bus, so the BMS can command AO 1 SpRel straight away; it is interpreted as flow, pressure or position per the factory-set application and is scaled between Min and Max. Read airflow or differential pressure plus BI 101 for alarms. If the bus watchdog is enabled, keep writing AO 1 or MO 1 inside the timeout.
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 |
|---|---|---|---|
| AO 1 | SpRel | Flow, pressure or position setpoint | Command |
| AI 19 | AbsFlow_UnitSel | Measured airflow | Read |
| AI 18 | DeltaP_UnitSel | Measured differential pressure | Read |
| AI 1 | RelPos | Damper position feedback | Read |
| BI 101 | SummaryStatus | Overall OK / not OK alarm | Read |
Enable & remote start
MV 122 SpSource = 2 (Bus, default) makes AO 1 the active setpoint; Analog uses the signal on wire 3, and then the watchdog only tracks MO 1.
Heartbeat & communication loss
AV 130 BusWatchdog, 0-3600 s, 0 = disabled. Writes to AO 1 or MO 1 reset the timer; on timeout their priority arrays are cleared and the relinquish defaults apply, and MI 110 shows Bus watchdog triggered.
Sensors & values from the BMS
Sensor 1 can be read when MV 220 is Active (0-10 V) or Passive (resistance) in AI 20, or Switch in BI 20. With the room pressure cascade enabled, S1 becomes the 0-10 V cascade input instead.
Network setup
- MS/TP only: baud 9600-115200, default 38400; MAC address 0-127, default 1; max 32 nodes without repeater.
- Default device instance 1.
- Configure with Belimo Assistant 2.
- AV 120 SystemAltitude (0-3000 m above sea level) is writable; set it to the installed altitude.
Watch out for
- Writable objects with instance 90 and above are persistent; do not write them on a regular basis.
- Min cannot be set above Max, and Max is limited to 20-100%.
- Airflow-not-reached is flagged after 600 s and pressure-not-reached after 180 s.
- Max 6 active COV subscriptions.
Belimo VAV-Universal VRU 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 | RelPos | Relative damper position in adapted range | % | Read | |
| AI | 2 | AbsPos | Absolute angular position | ° | Read | |
| AI | 6 | SpAnalog | Analog setpoint (flow, pressure or position) | % | Read | |
| AI | 9 | RelDeltaP | Differential pressure relative to nominal (AV 122) | % | Read | |
| AI | 10 | RelFlow | Airflow relative to nominal (AV 112) | % | Read | |
| AI | 12 | AbsFlow_m3h | Absolute airflow | m³/h | Read | |
| AImin | 18 | DeltaP_UnitSel | Differential pressure in selected unit | Pa or in. W.C. (MV 127) | Read | |
| AImin | 19 | AbsFlow_UnitSel | Absolute airflow in selected unit | m³/h, l/s or cfm (MV 121) | Read | |
| AI | 20 | Sens1Analog | Sensor 1 value (0-10 V or resistance) | Read | ||
| AI | 29 | DeltaP_Pa | Differential pressure | Pa | Read | |
| AOmin | 1 | SpRel | Relative setpoint (flow, pressure or position), scaled Min-Max | % | Command | |
| AV | 97 | Min | Minimum setpoint limit | % | Write | |
| AV | 98 | Max | Maximum setpoint limit (20-100%) | % | Write | |
| AV | 112 | Vnom_m3h | Nominal airflow | m³/h | Read | |
| AV | 119 | Vnom_UnitSel | Nominal airflow in selected unit | m³/h, l/s or cfm (MV 121) | Read | |
| AV | 120 | SystemAltitude | Installation altitude above sea level | m | Write | |
| AV | 122 | DeltaPnom_Pa | Nominal differential pressure of sensor | Pa | Read | |
| AV | 129 | DeltaPnom_UnitSel | Nominal differential pressure in selected unit | Pa or in. W.C. (MV 127) | Read | |
| AV | 130 | BusWatchdog | Bus watchdog timeout, 0 = disabled | s | Write | |
| BI | 20 | Sens1Switch | Sensor 1 switch input status | Read | 0=Inactive, 1=Active | |
| BI | 99 | BusTermination | 120 Ω bus termination enabled | Read | 0=Disabled, 1=Enabled | |
| BImin | 101 | SummaryStatus | Summary of all status objects | Read | 0=OK, 1=Not OK | |
| MV | 2 | ApplicationSel | Application set by the damper manufacturer | Read | 1=Flow control, 2=Pressure control, 3=Room pressure control, 4=Flow measurement | |
| MV | 10 | RmPCascade | Room pressure cascade via sensor input S1 | Read | 1=Disabled, 2=Enabled, 3=Enabled fast (M1R only) | |
| MI | 100 | InternalActivity | Internal activity running | Read | 1=None, 2=Test, 3=Adaptation, 4=Synchronization | |
| MI | 103 | StatusSensor | Differential pressure sensor status | Read | 1=OK, 2=dP sensor not OK, 3=dP sensor out of range, 4=dP sensor wrong connected | |
| MI | 104 | StatusFlow | Airflow status | Read | 1=OK, 2=–, 3=Airflow not reached | |
| MI | 106 | StatusActuator | Actuator status | Read | 1=OK, 2=–, 3=Gear train disengaged, 4=–, 5=Actuator doesn't fit to application | |
| MI | 109 | StatusPressure | Differential pressure control status | Read | 1=OK, 2=–, 3=Pressure not reached | |
| MI | 110 | StatusDevice | Device status (bus watchdog) | Read | 1=OK, 2=Bus watchdog triggered | |
| MO | 1 | Override | Override control of the setpoint | Command | 1=None, 2=Open, 3=Close, 4=Min, 5=–, 6=Max, 7=–, 8=–, 9=Motor stop | |
| MV | 100 | ControlMode | Control mode set by damper manufacturer | Read | 1=PosCtrl, 2=FlowCtrl | |
| MV | 102 | OperationMode | Room pressure direction (VRU-M1R-BAC only) | Write | 1=Negative pressure, 2=Positive pressure | |
| MV | 120 | Command | Start adaptation, test run or synchronization | Write | 1=None, 2=Adaptation, 3=Test run, 4=Synchronization | |
| MV | 121 | UnitSelAirFlow | Engineering unit for airflow objects | Write | 1=–, 2=m³/h, 3=l/s, 4=–, 5=–, 6=–, 7=cfm | |
| MV | 122 | SpSource | Setpoint source: analog wire 3 or bus AO 1 | Write | 1=Analog, 2=Bus | |
| MV | 127 | UnitSelPressure | Engineering unit for pressure objects | Write | 1=Pascal, 2=–, 3=Inches of water | |
| MV | 220 | Sens1Type | Sensor 1 type | Write | 1=None, 2=Active, 3=Passive, 4=–, 5=Switch |
No points match these filters.
Integration notes
- Which objects are in service depends on the application in MV 2; airflow objects are out of service in pressure applications and vice versa.
- MV 2 ApplicationSel and MV 100 ControlMode are read-only over BACnet; they are set by the damper manufacturer.
- Room pressure control and MV 102 OperationMode apply to the VRU-M1R-BAC only.
- MI 103 has no access marking in the document; it is listed as read-only.
- The sensor input S1 is not available while the room pressure cascade (MV 10) is enabled.
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 VAV-Universal VRU 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 VAV-Universal VRU
How many BACnet points does the Belimo VAV-Universal VRU have?
This list has 38 BACnet objects: 10 analog inputs, 1 analog output, 8 analog values, 3 binary inputs, 6 multi-state inputs, 1 multi-state output, 9 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Belimo VAV-Universal VRU BACnet points are writable?
12 of the 38 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 VAV-Universal VRU BACnet documentation?
The source is BACnet Interface Description, VAV-Universal VRU-D3-BAC, VRU-M1-BAC, VRU-M1R-BAC, revision 2026-01 / V1.04, published free by Belimo at https://www.belimo.com/mam/general-documents/system_integration/BACnet/belimo_BACnet_Interface-description_VRU_V1_4_en-gb.pdf.
What are the minimum BACnet points to integrate the Belimo VAV-Universal VRU?
Start with AO 1 SpRel (Flow, pressure or position setpoint); AI 19 AbsFlow_UnitSel (Measured airflow); AI 18 DeltaP_UnitSel (Measured differential pressure); AI 1 RelPos (Damper position feedback); BI 101 SummaryStatus (Overall OK / not OK alarm).
How do I enable BMS control of the Belimo VAV-Universal VRU?
MV 122 SpSource = 2 (Bus, default) makes AO 1 the active setpoint; Analog uses the signal on wire 3, and then the watchdog only tracks MO 1.
Does the Belimo VAV-Universal VRU need a BACnet heartbeat or have a communication timeout?
AV 130 BusWatchdog, 0-3600 s, 0 = disabled. Writes to AO 1 or MO 1 reset the timer; on timeout their priority arrays are cleared and the relinquish defaults apply, and MI 110 shows Bus watchdog triggered.
Can the BMS supply sensor values to the Belimo VAV-Universal VRU?
Sensor 1 can be read when MV 220 is Active (0-10 V) or Passive (resistance) in AI 20, or Switch in BI 20. With the room pressure cascade enabled, S1 becomes the 0-10 V cascade input instead.
How do I check these points on the real VAV-Universal VRU?
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 - Duct / outdoor sensors (temperature, humidity, CO2, VOC, differential pressure)
Belimo Duct and Pipe Sensors (22DTH, 22UTH, 22DTM, 22ADP) BACnet
Belimo BACnet MS/TP sensors: 22DTH duct temperature/humidity, 22UTH outdoor temperature/humidity, 22DTM duct CO2/VOC and 22ADP differential pressure/airflow sensors.
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-..).
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
Source: BACnet Interface Description, VAV-Universal VRU-D3-BAC, VRU-M1-BAC, VRU-M1R-BAC · rev. 2026-01 / V1.04. Object names, instances and units are reproduced as published; descriptions are our own.