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Indoor air quality sensor (room) · BACnet points list
Delta Electronics UNOslim IAQ sensor (BACnet MS/TP) BACnet points list
Updated 12 November 2026
The UNOslim is a slim room air quality sensor with RS-485 for Modbus RTU or BACnet MS/TP and an optional external thermistor. Over BACnet it reports temperature, humidity, CO2, VOC, PM1/PM2.5/PM10, the RESET air and viral indexes, built-in and external temperature/humidity and dew point, and has writable calibration, display, relay and NFC-lock values.
This page lists 31 BACnet objects for the Delta Electronics UNOslim IAQ sensor (BACnet MS/TP) — 12 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Delta Electronics’s own free documentation, linked below.
- Manufacturer
- Delta Electronics
- Model
- UNOslim IAQ sensor (BACnet MS/TP)
- Equipment
- Indoor air quality sensor (room)
- Equipment type
- Thermostats, sensors & meters
- BACnet objects
- 31 (12 writable)
- Transport
- BACnet MS/TP
- Firmware
- Not stated
- Default device instance
- From the serial number (e.g. SN 2512M0170040 gives 120040)
- Also known as
- UNOslim, UNO-M, Delta UNOslim, UNOslim RS485
- Source document
- UNOslim Modbus/BACnet User Guide · rev. VER 0.7
Reference only, provided as-is: verify against Delta Electronics’s current documentation and the live device before use. Not official Delta Electronics information. Terms of use.
BMS integration notes: Delta Electronics UNOslim IAQ sensor (BACnet MS/TP)
Select BACnet mode, set the MS/TP MAC (or write AV 5) and baud, then read the measurements. AV 10 lets the BMS drive the on-board relay.
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 10 | Relay_out_ref | Relay command: 1 = COM-NO closed | Write |
| AI 3 | CO2 | CO2, ppm | Read |
| AI 0 | Temperature | Room temperature, °C | Read |
| AI 2 | Humidity | Relative humidity, % | Read |
| AI 5 | PM2.5 | PM2.5, µg/m³ | Read |
| AI 4 | VOC | Total VOC, µg/m³ | Read |
| AI 8 | AQI | RESET air index, % | Read |
Network setup
- BACnet MS/TP baud: auto, 76800, 9600, 19200 or 38400; MAC 0-127; up to 32 nodes.
- Device instance comes from the serial number and is writable; factory reset restores it.
- AV 5 MAC_Address overrides the switch setting; the device reboots after the write.
Delta Electronics UNOslim IAQ sensor (BACnet MS/TP) 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 | Temperature | Temperature (thermistor if fitted, else built-in) | °C | Read | |
| AI | 1 | Temperature_F | Temperature in Fahrenheit | °F | Read | |
| AImin | 2 | Humidity | Relative humidity (thermistor-compensated if fitted) | % | Read | |
| AImin | 3 | CO2 | CO2 concentration | ppm | Read | |
| AImin | 4 | VOC | Total VOC | µg/m³ | Read | |
| AImin | 5 | PM2.5 | PM2.5 | µg/m³ | Read | |
| AI | 6 | PM10 | PM10 | µg/m³ | Read | |
| AI | 7 | PM1 | PM1 | µg/m³ | Read | |
| AImin | 8 | AQI | RESET air index, 0-100 | % | Read | |
| AI | 9 | RVI | RESET viral index, 0-99 (higher is better) | % | Read | |
| AI | 10 | RVI_Label | RVI category | Read | 0=Poor; 1=Unsatisfactory; 2=Needs Improvement; 3=Fair; 4=Good; 5=Excellent | |
| AI | 11 | Int_Temperature | Built-in sensor temperature | °C | Read | |
| AI | 12 | Int_Temperature_F | Built-in sensor temperature | °F | Read | |
| AI | 13 | Ext_Temperature | Thermistor temperature (if fitted) | °C | Read | |
| AI | 14 | Ext_Temeprature_F | Thermistor temperature (if fitted) | °F | Read | |
| AI | 15 | Int_Humidity | Built-in sensor humidity | % | Read | |
| AI | 16 | Ext_Humidity | Humidity using thermistor temperature (if fitted) | % | Read | |
| AI | 17 | Dew_Temeprature | Dew point temperature | °C | Read | |
| AV | 0 | Temperature_Cali | Temperature reference 0-50 in 0.01 °C; 9999 resets | °C | Write | |
| AV | 1 | Humidity_Cali | Humidity reference 10-90 %RH; 9999 resets | % | Write | |
| AV | 2 | CO2_Cali | CO2 reference 400-1500 ppm | % | Write | |
| AV | 3 | PM_Cali | PM2.5 reference 1-500; 9999 resets | µg/m³ | Write | |
| AV | 4 | VOC_Cali | TVOC reference 1-500; 9999 resets | µg/m³ | Write | |
| AV | 5 | MAC_Address | MS/TP MAC 0-127; 255 clears; reboots | Write | ||
| AV | 6 | CO2_ASC | CO2 automatic self-calibration | Write | 0=Disable; 1=Enable | |
| AV | 7 | Temp_Unit | Display temperature unit | Write | 0=Celsius; 1=Fahrenheit | |
| AV | 8 | Low_Power_Mode | Sensor low power mode | Write | 0=Disable; 1=Enable | |
| AV | 9 | Disp_mode | Display mode | Write | 0=Auto off (ToF); 1=Always on; 2=Always off | |
| AVmin | 10 | Relay_out_ref | Relay command | Write | 0=COM-NC closed; 1=COM-NO closed | |
| AV | 11 | Relay_val | Relay state | Read | 0=COM-NC closed; 1=COM-NO closed | |
| AV | 12 | NFC_Lock | Blocks configuration writes over NFC | Write | 0=Unlocked; 1=Locked |
No points match these filters.
Object ID lookup: Delta Electronics UNOslim IAQ sensor point IDs by name
AI0TemperatureAI1Temperature_FAI2HumidityAI3CO2AI4VOCAI5PM2.5AI6PM10AI7PM1AI8AQIAI9RVIAI10RVI_LabelAI11Int_TemperatureAI12Int_Temperature_FAI13Ext_TemperatureAI14Ext_Temeprature_FAI15Int_HumidityAI16Ext_HumidityAI17Dew_TemepratureAV0Temperature_CaliAV1Humidity_CaliAV2CO2_CaliAV3PM_CaliAV4VOC_CaliAV5MAC_AddressAV6CO2_ASCAV7Temp_UnitAV8Low_Power_ModeAV9Disp_modeAV10Relay_out_refAV11Relay_valAV12NFC_Lock
Integration notes
- AV 2 CO2_Cali is printed with unit % although its description is a CO2 value in ppm; kept as printed.
- AI 14 and AI 17 names are spelled Temeprature as printed.
- Access is printed per object (R, W, R/W); R/W is listed as W.
- Sensor status: read Status_Flags or Reliability.
- Different object set and numbering from the UNOlite and UNOnext.
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 UNOslim IAQ sensor (BACnet MS/TP) 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 Delta Electronics UNOslim IAQ sensor (BACnet MS/TP)
How many BACnet points does the Delta Electronics UNOslim IAQ sensor (BACnet MS/TP) have?
This list has 31 BACnet objects: 18 analog inputs, 13 analog values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Delta Electronics UNOslim IAQ sensor (BACnet MS/TP) BACnet points are writable?
12 of the 31 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 Delta Electronics UNOslim IAQ sensor (BACnet MS/TP) BACnet documentation?
The source is UNOslim Modbus/BACnet User Guide, revision VER 0.7, published free by Delta Electronics at https://isdweb.deltaww.com/resources/files/UNOslim_RS485_User_Guide.pdf.
What are the minimum BACnet points to integrate the Delta Electronics UNOslim IAQ sensor (BACnet MS/TP)?
Start with AV 10 Relay_out_ref (Relay command: 1 = COM-NO closed); AI 3 CO2 (CO2, ppm); AI 0 Temperature (Room temperature, °C); AI 2 Humidity (Relative humidity, %); AI 5 PM2.5 (PM2.5, µg/m³); AI 4 VOC (Total VOC, µg/m³); AI 8 AQI (RESET air index, %).
How do I check these points on the real UNOslim IAQ sensor (BACnet MS/TP)?
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 Delta Electronics BACnet points lists
- Power and energy meter (panel meter)
Delta Electronics DPM-C530A power meter (BACnet MS/TP)
Delta Electronics DPM-C530A multifunction power meters on BACnet MS/TP.
Also known as: DPM-C530A, Delta DPM-C530, Delta multifunction power meter BACnet - Indoor air quality sensor (room)
Delta Electronics UNOlite indoor air quality monitor (BACnet MS/TP)
Delta UNOlite indoor air quality monitors (including the LWD model) with DIP switch 7 set to BACnet MS/TP.
Also known as: UNOlite, UNOlite LWD, Delta UNOlite, UNOLite BACnet - Indoor air quality sensor (room)
Delta Electronics UNOnext indoor air quality monitor (BACnet MS/TP)
Delta UNOnext indoor air quality monitors in the BACnet MS/TP version.
Also known as: UNOnext, Delta UNOnext, UNOnext BACnet MS/TP - Variable frequency drive
Delta Electronics VFD-CP2000 (embedded BACnet MS/TP)
Delta Electronics VFD-CP2000 AC motor drives using the built-in RS-485 port as BACnet MS/TP.
Also known as: CP2000, VFD-CP2000, Delta CP2000, Delta VFD CP2000
Source: UNOslim Modbus/BACnet User Guide · rev. VER 0.7. Object names, instances and units are reproduced as published; descriptions are our own.