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VAV compact controller (actuator with flow sensor) · BACnet points list
Belimo VAV-Compact BACnet points list
Updated 28 October 2026
The VAV-Compact is a damper actuator with a built-in differential pressure sensor and VAV controller for box-level airflow control. Over BACnet MS/TP it takes a relative setpoint on AO 1 that is scaled between the Min and Max limits and interpreted as airflow or position. It reports damper position, airflow, an optional sensor input and actuator status.
This page lists 23 BACnet objects for the Belimo VAV-Compact — 10 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-Compact
- Equipment
- VAV compact controller (actuator with flow sensor)
- Equipment type
- Valves & actuators
- BACnet objects
- 23 (10 writable)
- Transport
- BACnet MS/TP
- Firmware
- Modbus Module V1.0 (interface description V3.08)
- Default device instance
- 1
- Also known as
- VAV-Compact MOD, ..MV-D3-MOD, ..HV24A-MOD, LMV-D3-MOD, NMV-D3-MOD, SMV-D3-MOD, LHV24A-MOD
BMS integration notes: Belimo VAV-Compact
Leave MV 122 SpSource on Bus (default), select flow control in MV 123, set Min and Max airflow once, then command AO 1 SpRel. Read AI 19 airflow, AI 1 position and BI 101 summary status. If you turn on the bus watchdog, keep rewriting 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 | Airflow setpoint between Min and Max | Command |
| AI 19 | AbsFlow_UnitSel | Measured airflow | 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, the default) makes the actuator follow AO 1. In hybrid mode (SpSource = Analog) the 0-10 V signal on wire 3 is the setpoint and only MO 1 is taken from the bus.
Heartbeat & communication loss
AV 130 Bus Watchdog, 0-3600 s, default 0 (off). When set, each write to AO 1 or MO 1 restarts the timer; on timeout the AO 1 priority array is cleared, the relinquish default (0%) applies and MI 110 shows Bus Watchdog triggered. In hybrid mode only MO 1 writes are tracked.
Sensors & values from the BMS
Sensor 1 can be read over BACnet when MV 220 is set to Active (AI 20, mV) or Switch (BI 20). Switch mode needs the control signal configured to 2-10 V; restart the actuator after changing the sensor type.
Network setup
- MS/TP: baud 9600-76800, default 38400; MAC address 0-127, default 1; max 32 nodes without repeater.
- Default device instance 1.
- Quick addressing with the Address and Adaption buttons on the actuator (see datasheet).
- Configuration tool: ZTH EU; bus termination state shows in BI 99.
Watch out for
- Writable objects with instance 90 and above are persistent; do not write them on a regular basis.
- Max must be at least Min and above 20%.
- Fast open / Fast close overrides add mechanical wear; keep them for time-critical events such as frost protection.
- Max 6 active COV subscriptions.
Belimo VAV-Compact 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 | % | Read | |
| AI | 2 | AbsPos | Absolute position (degrees rotary, mm linear) | ° or mm | Read | |
| AI | 6 | SpAnalog | Analog setpoint when setpoint source is analog | % | Read | |
| AI | 10 | RelFlow | Airflow relative to nominal | % | Read | |
| AImin | 19 | AbsFlow_UnitSel | Absolute airflow in selected unit | m³/s, m³/h, l/s, l/min, l/h, gpm or cfm (MV 121) | Read | |
| AI | 20 | Sens1Analog | Sensor 1 input as analog value | mV | Read | |
| AOmin | 1 | SpRel | Relative setpoint, scaled between Min and Max | % | Command | |
| AV | 97 | Min | Minimum airflow / position setpoint | % | Write | |
| AV | 98 | Max | Maximum airflow / position setpoint (> 20%) | % | Write | |
| AV | 104 | Vnom_UnitSel | Nominal airflow in selected unit | m³/s, m³/h, l/s, l/min, l/h, gpm or cfm (MV 121) | Read | |
| AV | 130 | Bus Watchdog | Bus watchdog timeout, 0 = off | s | Write | |
| BI | 20 | Sens1Switch | Sensor 1 as switch input | Read | Inactive=Inactive, Active=Active | |
| BI | 99 | BusTermination | 120 Ω bus termination enabled | Read | Inactive=Inactive, Active=Active | |
| BImin | 101 | SummaryStatus | Summary of MI 106 and MI 110 | Read | Inactive=OK, Active=Not OK | |
| MI | 100 | InternalActivity | Internal test or adaptation running | Read | 1=None, 2=Test, 3=Adaptation | |
| MI | 106 | StatusActuator | Actuator status (latched, reset via MV 120) | Read | 1=OK, 2=Actuator cannot move, 3=Gear train disengaged, 4=Mechanical travel increased | |
| MI | 110 | StatusDevice | Device status | Read | 1=OK, 2=Bus Watchdog triggered | |
| MO | 1 | Override | Override control of the setpoint | Command | 1=None, 2=Open, 3=Close, 4=Min_Vmin, 5=Mid_Vmid, 6=Max_Vmax, 7=Fast open, 8=Fast close | |
| MV | 120 | Command | Start adaption, test or status reset | Write | 1=None, 2=Adaption, 3=Test, 4=Reset | |
| MV | 121 | UnitSelFlow | Engineering unit for flow objects | Write | 1=m³/s, 2=m³/h, 3=l/s, 4=l/min, 5=l/h, 6=gpm, 7=cfm | |
| MV | 122 | SpSource | Setpoint source: analog wire 3 or bus AO 1 | Write | 1=Analog, 2=Bus | |
| MV | 123 | ControlMode | Position or flow control | Write | 1=PosCtrl, 2=FlowCtrl | |
| MV | 220 | Sens1Type | Sensor 1 input type | Write | 1=None, 2=Active / hybrid, 3=–, 4=–, 5=Switch, 6=–, 7=–, 8=–, 9=–, 10=–, 11=– |
No points match these filters.
Integration notes
- The same devices can also run Modbus RTU; this list covers the BACnet MS/TP mode.
- The default setpoint source is Bus.
- AI 20 and BI 20 are out of service unless MV 220 selects the matching sensor type and the setpoint source is Bus.
- Actuator status faults are latched; clear them with MV 120 Command = Reset.
- Flow unit of AI 19 and AV 104 follows MV 121.
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-Compact 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-Compact
How many BACnet points does the Belimo VAV-Compact have?
This list has 23 BACnet objects: 6 analog inputs, 1 analog output, 4 analog values, 3 binary inputs, 3 multi-state inputs, 1 multi-state output, 5 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Belimo VAV-Compact BACnet points are writable?
10 of the 23 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-Compact BACnet documentation?
The source is BACnet Interface Description, VAV-Compact, revision 2026-01 / V3.08, published free by Belimo at https://www.belimo.com/mam/general-documents/system_integration/BACnet/belimo_BACnet_Interface-description_VAV_V3_8_en-gb.pdf.
What are the minimum BACnet points to integrate the Belimo VAV-Compact?
Start with AO 1 SpRel (Airflow setpoint between Min and Max); AI 19 AbsFlow_UnitSel (Measured airflow); AI 1 RelPos (Damper position feedback); BI 101 SummaryStatus (Overall OK / not OK alarm).
How do I enable BMS control of the Belimo VAV-Compact?
MV 122 SpSource = 2 (Bus, the default) makes the actuator follow AO 1. In hybrid mode (SpSource = Analog) the 0-10 V signal on wire 3 is the setpoint and only MO 1 is taken from the bus.
Does the Belimo VAV-Compact need a BACnet heartbeat or have a communication timeout?
AV 130 Bus Watchdog, 0-3600 s, default 0 (off). When set, each write to AO 1 or MO 1 restarts the timer; on timeout the AO 1 priority array is cleared, the relinquish default (0%) applies and MI 110 shows Bus Watchdog triggered. In hybrid mode only MO 1 writes are tracked.
Can the BMS supply sensor values to the Belimo VAV-Compact?
Sensor 1 can be read over BACnet when MV 220 is set to Active (AI 20, mV) or Switch (BI 20). Switch mode needs the control signal configured to 2-10 V; restart the actuator after changing the sensor type.
How do I check these points on the real VAV-Compact?
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 / 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, VAV-Compact · rev. 2026-01 / V3.08. Object names, instances and units are reproduced as published; descriptions are our own.