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Duct sensor (CO2, humidity, temperature) · BACnet points list
E+E Elektronik EE850D / EE820D duct CO2 transmitter (BACnet MS/TP) BACnet points list
Updated 12 November 2026Unofficial source
The EE850D (CO2, humidity and temperature) and EE820D (CO2 only) are transmitters that work as BACnet MS/TP smart sensors. CO2 comes first in the object list (AI 0-1); the EE850D adds temperature, humidity and the calculated humidity values on AI 2-9.
This page lists 10 BACnet objects for the E+E Elektronik EE850D / EE820D duct CO2 transmitter (BACnet MS/TP) — 0 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from a copy of E+E Elektronik’s documentation hosted by Instrumart, not by E+E Elektronik itself, so treat it as unofficial.
- Manufacturer
- E+E Elektronik
- Model
- EE850D / EE820D duct CO2 transmitter (BACnet MS/TP)
- Equipment
- Duct sensor (CO2, humidity, temperature)
- Equipment type
- Thermostats, sensors & meters
- BACnet objects
- 10 (0 writable)
- Transport
- BACnet MS/TP
- Firmware
- 1.0
- Also known as
- EE850D, EE820D, EE850, EE820, E+E EE850 BACnet, E+E EE820 BACnet
- Source document
- BACnet PICS EE850D & EE820D · PICS_EE850D_EE820D v1.1 · rev. 03.07.2018 (unofficial copy, hosted by Instrumart)
Reference only, provided as-is: verify against E+E Elektronik’s current documentation and the live device before use. Not official E+E Elektronik information. Terms of use.
BMS integration notes: E+E Elektronik EE850D / EE820D duct CO2 transmitter (BACnet MS/TP)
Set a unique device instance and MAC address, then poll AI 0 for CO2. On the EE850D also read temperature (AI 2) and humidity (AI 3).
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 |
|---|---|---|---|
| AI 0 | CO2 | CO2, averaged | Read |
| AI 2 | T | Temperature (EE850D only) | Read |
| AI 3 | RH | Relative humidity (EE850D only) | Read |
Network setup
- Device instance (0-4194302) and device name are writable and kept in non-volatile memory; the default name is the model plus 8 unique characters.
- RS485 settings are one writable string property, default "9600-8n1"; baud 9600-115200, 8 data bits, no parity, 1 stop bit fixed.
- Max Master is writable, up to 127.
- ReinitializeDevice and DeviceCommunicationControl need the password printed in the PICS.
Watch out for
- Present_Value is only writable while Out_Of_Service is true; the value then defaults to 50.0.
- Default RS485 string is 9600-8n1 here, not 38400 as on other E+E sensors.
E+E Elektronik EE850D / EE820D duct CO2 transmitter (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 | CO2 | CO2, averaged | ppm | Read | |
| AI | 1 | CO2raw | CO2 raw value | ppm | Read | |
| AImin | 2 | T | Temperature (EE850D only) | °C / °F / K | Read | |
| AImin | 3 | RH | Relative humidity (EE850D only) | %rH | Read | |
| AI | 4 | e | Water vapor partial pressure (EE850D only) | mbar / psi | Read | |
| AI | 5 | Td | Dew point temperature (EE850D only) | °C / °F / K | Read | |
| AI | 6 | dv | Absolute humidity (EE850D only) | g/m³ / g/ft³ | Read | |
| AI | 7 | r | Mixing ratio (EE850D only) | g/kg / gr/lb | Read | |
| AI | 8 | h | Enthalpy (EE850D only) | kJ/kg / ft·lbf/lb / BTU/lb | Read | |
| AI | 9 | Tf | Frost point temperature (EE850D only) | °C / °F / K | Read |
No points match these filters.
Object ID lookup: E+E Elektronik EE850D / EE820D point IDs by name
Integration notes
- Object list from the PICS sections 11-12 (dated 03.07.2018). The EE820D has only AI 0 and AI 1.
- The object order differs from the EE800D room transmitter: CO2 is AI 0 here.
- The transmitter-difference table heads both columns EE850D; the second column (CO2 only) is the EE820D per the object list.
- All objects are read-only except Present_Value while Out_Of_Service is true.
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 EE850D / EE820D duct CO2 transmitter (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 E+E Elektronik EE850D / EE820D duct CO2 transmitter (BACnet MS/TP)
How many BACnet points does the E+E Elektronik EE850D / EE820D duct CO2 transmitter (BACnet MS/TP) have?
This list has 10 BACnet objects: 10 analog inputs. The exact set on a given unit depends on its firmware, installed options and configuration.
Which E+E Elektronik EE850D / EE820D duct CO2 transmitter (BACnet MS/TP) BACnet points are writable?
None of the listed objects are marked writable in the source documentation.
Where is the official E+E Elektronik EE850D / EE820D duct CO2 transmitter (BACnet MS/TP) BACnet documentation?
E+E Elektronik does not publish it on its own website. This list comes from BACnet PICS EE850D & EE820D (PICS_EE850D_EE820D v1.1), revision 03.07.2018, a copy hosted by Instrumart at https://www.instrumart.com/assets/ee-ee820-co2-transmitter-bacnet-protocol-implementation.pdf. Ask E+E Elektronik or its representative for the current revision.
What are the minimum BACnet points to integrate the E+E Elektronik EE850D / EE820D duct CO2 transmitter (BACnet MS/TP)?
Start with AI 0 CO2 (CO2, averaged); AI 2 T (Temperature (EE850D only)); AI 3 RH (Relative humidity (EE850D only)).
How do I check these points on the real EE850D / EE820D duct CO2 transmitter (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 E+E Elektronik BACnet points lists
- Differential pressure sensor
E+E Elektronik EE600D / EE610D differential pressure transmitter (BACnet MS/TP)
E+E EE600 and EE610 differential pressure transmitters with the RS485 BACnet MS/TP output.
Also known as: EE600D, EE610D, EE600, EE610, E+E EE600 BACnet - Room sensor (CO2, humidity, temperature)
E+E Elektronik EE800D room CO2, humidity and temperature transmitter (BACnet MS/TP)
E+E EE800 room transmitters with the RS485 BACnet MS/TP output.
Also known as: EE800D, EE800, E+E EE800 BACnet - CO2 sensor probe (CO2, humidity, temperature, pressure)
E+E Elektronik EE872 OM CO2 probe (BACnet MS/TP)
E+E EE872 CO2 probes with the BACnet MS/TP output: EE872-M10 (CO2 only) and EE872-M13 (CO2 plus temperature, humidity and pressure).
Also known as: EE872, EE872OM, EE872-M10, EE872-M13, E+E EE872 BACnet - Room sensor (temperature, humidity, CO2)
E+E Elektronik Room Sensor RS485 BACnet (TES201, HTS201, CDS201)
E+E Elektronik room sensors with RS485 BACnet MS/TP: TES201 (temperature), HTS201 (humidity/temperature) and CDS201 (CO2/humidity/temperature).
Also known as: TES201, HTS201, CDS201, E+E Room Sensor RS485, E+E room sensor BACnet MS/TP
Source: BACnet PICS EE850D & EE820D · PICS_EE850D_EE820D v1.1 · rev. 03.07.2018. Object names, instances and units are reproduced as published; descriptions are our own.