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Humidity and temperature sensor (duct transmitter) · BACnet points list
Vaisala HMD65 humidity and temperature duct transmitter (BACnet MS/TP) BACnet points list
Updated 6 November 2026
The HMD65 duct transmitter selects Modbus RTU or BACnet MS/TP by DIP switch. On BACnet it serves relative humidity, temperature and six calculated humidity values (dewpoint, dew/frost point, wet bulb, absolute humidity, mixing ratio, enthalpy) as Analog Inputs, plus a writable operating pressure value used in the calculations.
This page lists 9 BACnet objects for the Vaisala HMD65 humidity and temperature duct transmitter (BACnet MS/TP) — 1 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Vaisala’s own free documentation, linked below.
- Manufacturer
- Vaisala
- Model
- HMD65 humidity and temperature duct transmitter (BACnet MS/TP)
- Equipment
- Humidity and temperature sensor (duct transmitter)
- Equipment type
- Thermostats, sensors & meters
- BACnet objects
- 9 (1 writable)
- Transport
- BACnet MS/TP
- Firmware
- Not stated
- Also known as
- HMD65, Vaisala HMD65, HMD65 BACnet, M212243EN
- Source document
- HMD65 User Guide, BACnet Reference · M212243EN-C
Reference only, provided as-is: verify against Vaisala’s current documentation and the live device before use. Not official Vaisala information. Terms of use.
BMS integration notes: Vaisala HMD65 humidity and temperature duct transmitter (BACnet MS/TP)
Set BACnet mode, MAC address and bit rate on the DIP switches, then read RH and temperature (and dewpoint or enthalpy if needed). If the site is far from sea level, write the operating pressure once.
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.
Sensors & values from the BMS
AV 1 OPER P (operating pressure, hPa, default 1013.25) can be written by the BMS for the humidity calculations.
Network setup
- MAC 0-127 (master only) on the address DIP switches; a mode DIP switch selects BACnet MS/TP.
- Bit rate 9600-115200 by DIP switch; all-off = 38400 for BACnet; the 4800 setting also gives 38400.
- Fixed 8N1. 120 ohm termination by DIP switch.
- Device instance, name, location and Max_Master are set with Vaisala Insight (USB cable 219690); remote management password default 1234.
- No segmentation; Max_Info_Frames 1.
Watch out for
- 4800 bps is not valid for BACnet; the transmitter falls back to 38400.
- OPER P is stored in non-volatile memory; write it once, not cyclically.
Vaisala HMD65 humidity and temperature duct 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 | 1 | RH | Relative humidity | %RH | Read | |
| AImin | 2 | T | Temperature | °C (Units writable: °C/°F) | Read | |
| AImin | 3 | Td | Dewpoint | °C or °F | Read | |
| AI | 4 | Tdf | Dew/frost point | °C or °F | Read | |
| AI | 5 | Tw | Wet bulb temperature | °C or °F | Read | |
| AI | 6 | a | Absolute humidity | g/m3 or gr/ft3 | Read | |
| AI | 7 | x | Mixing ratio | g/kg or gr/lb | Read | |
| AI | 8 | h | Enthalpy | kJ/kg or Btu/lb | Read | |
| AV | 1 | OPER P | Operating pressure for humidity calculations (default 1013.25) | hPa | Write |
No points match these filters.
Object ID lookup: Vaisala HMD65 humidity and temperature duct transmitter point IDs by name
Integration notes
- Units of the temperature and calculated objects can be switched between metric and non-metric over BACnet; absolute humidity and mixing ratio use Vaisala-defined codes for the non-metric units.
- Analog Input Present_Value can be written only when Out_Of_Service is set.
- AI 1 and AI 2 report Reliability OVER_RANGE/UNDER_RANGE outside 0-100 %RH and -40 to +80 °C.
- Source: HMD65 User Guide M212243EN-C, BACnet Reference (Vaisala online documentation).
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 HMD65 humidity and temperature duct 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 Vaisala HMD65 humidity and temperature duct transmitter (BACnet MS/TP)
How many BACnet points does the Vaisala HMD65 humidity and temperature duct transmitter (BACnet MS/TP) have?
This list has 9 BACnet objects: 8 analog inputs, 1 analog value. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Vaisala HMD65 humidity and temperature duct transmitter (BACnet MS/TP) BACnet points are writable?
1 of the 9 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 Vaisala HMD65 humidity and temperature duct transmitter (BACnet MS/TP) BACnet documentation?
The source is HMD65 User Guide, BACnet Reference (M212243EN-C), published free by Vaisala at https://docs.vaisala.com/r/M212243EN-C/en-US.
What are the minimum BACnet points to integrate the Vaisala HMD65 humidity and temperature duct transmitter (BACnet MS/TP)?
Start with AI 1 RH (Relative humidity, %); AI 2 T (Temperature); AI 3 Td (Dewpoint temperature).
Can the BMS supply sensor values to the Vaisala HMD65 humidity and temperature duct transmitter (BACnet MS/TP)?
AV 1 OPER P (operating pressure, hPa, default 1013.25) can be written by the BMS for the humidity calculations.
How do I check these points on the real HMD65 humidity and temperature duct 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 Vaisala BACnet points lists
- CO2, temperature and humidity sensor (wall transmitter)
Vaisala GMW90 series CO2, temperature and humidity transmitter (BACnet MS/TP)
Vaisala GMW90 series wall transmitters with digital output (GMW95 models), set to the BACnet MS/TP protocol.
Also known as: GMW95, GMW95D, GMW95R, GMW95RD, GMW90 BACnet, XMW90, Vaisala CO2 transmitter BACnet, M211659EN - Humidity and temperature sensor (wall transmitter)
Vaisala HMW90 series humidity and temperature transmitter (BACnet MS/TP)
Vaisala HMW90 series wall transmitters with digital output (HMW95 models), set to the BACnet MS/TP protocol.
Also known as: HMW95, HMW90 BACnet, XMW90, Vaisala humidity transmitter BACnet, M211399EN
Source: HMD65 User Guide, BACnet Reference · M212243EN-C. Object names, instances and units are reproduced as published; descriptions are our own.