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VAV diffuser (thermal-electric / motorized) · BACnet points list
Acutherm E-Series interoperable VAV diffusers BACnet points list
Updated 6 November 2026
E-Series diffusers are self-contained VAV diffusers that can run stand-alone or take commands over BACnet MS/TP. The object list has 44 objects: room, supply air and airflow readings, effective setpoint and terminal load, occupied/unoccupied/standby setpoints and flow limits, BMS overrides for occupancy, heat/cool mode, setpoint, room and supply temperature, airflow and damper position, and diagnostics.
This page lists 44 BACnet objects for the Acutherm E-Series interoperable VAV diffusers — 33 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Acutherm’s own free documentation, linked below.
- Manufacturer
- Acutherm
- Model
- E-Series interoperable VAV diffusers
- Equipment
- VAV diffuser (thermal-electric / motorized)
- Equipment type
- VAV boxes & fan coils
- BACnet objects
- 44 (33 writable)
- Transport
- BACnet MS/TP
- Firmware
- Not stated
- Also known as
- E-Series, Acutherm E-Series, Form 090.202, 090p202
Reference only, provided as-is: verify against Acutherm’s current documentation and the live device before use. Not official Acutherm information. Terms of use.
BMS integration notes: Acutherm E-Series interoperable VAV diffusers
Run the diffuser from the BMS by writing AV_21 iOccMode and AV_23 iTempSetpt (and AV_26 iRmTemp if the BMS supplies room temperature); read AI_0 room temperature, AI_3 effective setpoint, AI_2 airflow and AI_4 terminal load.
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 |
|---|---|---|---|
| AV 21 | iOccMode | Occupancy override: 0 occupied, 1 unoccupied, 2 standby | Write |
| AV 23 | iTempSetpt | Occupied room setpoint from BMS (3276 = none) | Write |
| AI 0 | oRmTemp | Room temperature used for control | Read |
| AI 3 | oEffectStpt | Effective room setpoint | Read |
| AI 1 | oSATemp | Supply air temperature | Read |
| AI 2 | oAirFlow | Air flow rate, cfm | Read |
| AI 4 | oTmnlLoad | Terminal load: + cooling, - heating, % | Read |
Enable & remote start
The diffuser defaults to occupied mode; AV_21 iOccMode overrides it to unoccupied or standby. AV_22 iHCMode overrides the heat/cool choice (9 = invalid, ignored).
Sensors & values from the BMS
AV_26 iRmTemp, AV_27 iSATemp and AV_28 iFlowRate replace the built-in sensors; AV_29 iCO2Level feeds a CO2 value for the purge function. Write the invalid value to go back to the built-in sensor.
Network setup
- AV_14 cBaudrate selects 38400 (0, default), 9600, 19200 or 57600; cycle power after changing it.
Watch out for
- AV_25 iOverride forces the damper; return it to normal for automatic control.
Acutherm E-Series interoperable VAV diffusers 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.
Note: the source document has no read/write column, so access here is inferred from the object type (inputs read-only, values writable). Confirm on the live controller before writing.
| Description | States | |||||
|---|---|---|---|---|---|---|
| BV | 0 | iVacancyMode | Vacancy | Write | 0=off, 1=on | |
| BV | 1 | iPowerDbg | Diagnostics | Write | 0=off, 1=on | |
| BV | 2 | iFlowDbg | Diagnostics | Write | 0=off, 1=on | |
| AV | 0 | cMaxFlow | Maximum Flow Set Point | cfm | Write | |
| AV | 1 | cMinFlow | Minimum Flow Set Point | cfm | Write | |
| AV | 2 | cMinStbyFlow | Minimum Flow Standby Set Point | cfm | Write | |
| AV | 3 | cCO2sp | CO2 Set Point | ppm | Write | |
| AV | 4 | cOccCoolsp | Cooling Set Point Occupied Mode | °F | Write | |
| AV | 5 | cUnocCoolsp | Cooling Set Point Unoccupied Mode | °F | Write | |
| AV | 6 | cStndbyCoolsp | Cooling Set Point Standby Mode | °F | Write | |
| AV | 7 | cOccHeatsp | Heating Set Point Occupied Mode | °F | Write | |
| AV | 8 | cUnocHeatsp | Heating Set Point Unoccupied Mode | °F | Write | |
| AV | 9 | cStndbyHeatsp | Heating Set Point Standby Mode | °F | Write | |
| AV | 10 | cStPtLimit | Set Point Limit | °F | Write | |
| AV | 11 | cStPtReset | Set Point Reset | Write | 0=off, 1=on | |
| AV | 12 | cMaxHeatsp | Maximum Air Flow in Heating | % | Write | |
| AV | 13 | cHCMode | Heating/Cooling Mode | Write | 0=automatic, 1=cooling, 2=heating | |
| AV | 14 | cBaudrate | Baud Rate | Write | 0=38400, 1=9600, 2=19200, 3=57600 | |
| AV | 15 | cVacSpOfst | Vacancy Set Point Offset | °F | Write | |
| AV | 16 | cRmOffset | Factory Calibration (room temperature offset) | °F x 100 | Write | |
| AV | 17 | cSAOffset | Factory Calibration (supply air temperature offset) | °F x 100 | Write | |
| AV | 18 | cFlowOffset | Factory Calibration (air flow rate offset) | cfm | Write | |
| AV | 19 | cFlowScaler | Factory Calibration (air flow multiplier) | % | Write | |
| AV | 20 | cFBoffset | Factory Calibration (over temp protection offset) | Write | ||
| AVmin | 21 | iOccMode | Override Occupancy Mode | Write | 0=occupied, 1=unoccupied, 2=standby | |
| AV | 22 | iHCMode | Override Heating/Cooling Mode | Write | 0=automatic, 1=cooling, 2=heating | |
| AVmin | 23 | iTempSetpt | Room Temperature Set Point | °F | Write | |
| AV | 24 | iFlowSetpt | Airflow (option 5) or damper % (option 6) target for AV_25 | cfm or % | Write | |
| AV | 25 | iOverride | Override Diffuser Damper Position | Write | 0=automatic, 1=full open, 2=full closed, 3=cMaxFlow, 4=cMinFlow, 5=iFlowSetpt (cfm), 6=iFlowSetpt (% open, motorized units only) | |
| AV | 26 | iRmTemp | Override Room Temperature | °F | Write | |
| AV | 27 | iSATemp | Override Supply Air Temperature | °F | Write | |
| AV | 28 | iFlowRate | Override Air Flow Rate | cfm | Write | |
| AV | 29 | iCO2Level | Input from CO2 Sensor | ppm | Write | |
| AImin | 0 | oRmTemp | Room Temperature | °F | Read | |
| AImin | 1 | oSATemp | Supply Air Temperature | °F | Read | |
| AImin | 2 | oAirFlow | Air Flow Rate | cfm | Read | |
| AImin | 3 | oEffectStpt | Room Temperature Set Point | °F | Read | |
| AImin | 4 | oTmnlLoad | Terminal load: + in cooling, - in heating | % | Read | |
| AI | 5 | oDbg1 | Diagnostics (output dependent upon iFlowDbg and iPowerDbg) | Read | ||
| AI | 6 | oDbg2 | Diagnostics (output dependent upon iFlowDbg and iPowerDbg) | Read | ||
| AI | 7 | oDbg3 | Diagnostics (output dependent upon iFlowDbg and iPowerDbg) | Read | ||
| AI | 8 | oDbg4 | Diagnostics (output dependent upon iFlowDbg and iPowerDbg) | Read | ||
| AI | 9 | oDbg5 | Diagnostics (output dependent upon iFlowDbg and iPowerDbg) | Read | ||
| AI | 10 | oDbg6 | Diagnostics (output dependent upon iFlowDbg and iPowerDbg) | Read |
No points match these filters.
Object ID lookup: Acutherm E-Series interoperable VAV diffusers point IDs by name
BV0iVacancyModeBV1iPowerDbgBV2iFlowDbgAV0cMaxFlowAV1cMinFlowAV2cMinStbyFlowAV3cCO2spAV4cOccCoolspAV5cUnocCoolspAV6cStndbyCoolspAV7cOccHeatspAV8cUnocHeatspAV9cStndbyHeatspAV10cStPtLimitAV11cStPtResetAV12cMaxHeatspAV13cHCModeAV14cBaudrateAV15cVacSpOfstAV16cRmOffsetAV17cSAOffsetAV18cFlowOffsetAV19cFlowScalerAV20cFBoffsetAV21iOccModeAV22iHCModeAV23iTempSetptAV24iFlowSetptAV25iOverrideAV26iRmTempAV27iSATempAV28iFlowRateAV29iCO2LevelAI0oRmTempAI1oSATempAI2oAirFlowAI3oEffectStptAI4oTmnlLoadAI5oDbg1AI6oDbg2AI7oDbg3AI8oDbg4AI9oDbg5AI10oDbg6
Integration notes
- The list marks each object as input (i), configuration (c) or output (o); outputs are listed read-only and inputs/configuration writable.
- Override inputs are disabled by writing their "invalid" value (for example 3276 for iTempSetpt, 327 for iRmTemp).
- AV_16-AV_20 are factory calibration values; AI_5-AI_10 are diagnostics.
- Object names are the short names printed in brackets (for example cMaxFlow).
- This is a different object list from the Acutherm Advantage digital VAV diffuser list.
- AV_25 option 6 (damper % open) carries footnote 1 in the document, which makes it print as "61"; it applies to motorized diffusers only.
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. This list is provided as-is for reference only and may contain mistakes — confirming it before you write, map or commission anything is up to you (terms). Easy BACnet scans a network for BACnet IP devices from an Android phone, reads every object on the E-Series interoperable VAV diffusers 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 Acutherm E-Series interoperable VAV diffusers
How many BACnet points does the Acutherm E-Series interoperable VAV diffusers have?
This list has 44 BACnet objects: 11 analog inputs, 30 analog values, 3 binary values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Acutherm E-Series interoperable VAV diffusers BACnet points are writable?
33 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. The source has no read/write column, so this is inferred from object type.
Where is the official Acutherm E-Series interoperable VAV diffusers BACnet documentation?
The source is E-Series Interoperable VAV Diffusers - BACnet Object List (Form 090.202), revision Rev 1704, published free by Acutherm at https://acutherm.com/wp-content/uploads/2023/07/090p202_E-Series_BACnet_Object_List.pdf.
What are the minimum BACnet points to integrate the Acutherm E-Series interoperable VAV diffusers?
Start with AV 21 iOccMode (Occupancy override: 0 occupied, 1 unoccupied, 2 standby); AV 23 iTempSetpt (Occupied room setpoint from BMS (3276 = none)); AI 0 oRmTemp (Room temperature used for control); AI 3 oEffectStpt (Effective room setpoint); AI 1 oSATemp (Supply air temperature); AI 2 oAirFlow (Air flow rate, cfm); AI 4 oTmnlLoad (Terminal load: + cooling, - heating, %).
How do I enable BMS control of the Acutherm E-Series interoperable VAV diffusers?
The diffuser defaults to occupied mode; AV_21 iOccMode overrides it to unoccupied or standby. AV_22 iHCMode overrides the heat/cool choice (9 = invalid, ignored).
Can the BMS supply sensor values to the Acutherm E-Series interoperable VAV diffusers?
AV_26 iRmTemp, AV_27 iSATemp and AV_28 iFlowRate replace the built-in sensors; AV_29 iCO2Level feeds a CO2 value for the purge function. Write the invalid value to go back to the built-in sensor.
How do I check these points on the real E-Series interoperable VAV diffusers?
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 Acutherm BACnet points lists
Source: E-Series Interoperable VAV Diffusers - BACnet Object List · Form 090.202 · rev. Rev 1704. Object names, instances and units are reproduced as published; descriptions are our own.