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Duct / outdoor dewpoint and humidity sensor · BACnet points list
Greystone Energy Systems DW Series duct / outside air dewpoint transmitter (BACnet MS/TP) BACnet points list
Updated 6 November 2026
The DW is a Greystone duct or outside-air dewpoint transmitter with native BACnet MS/TP. It reports temperature, RH and calculated dewpoint, wet bulb and enthalpy as Analog Inputs; Analog Values hold offsets and barometric pressure/altitude, Binary Values select units, and one Multi-State Value picks what the LCD shows.
This page lists 12 BACnet objects for the Greystone Energy Systems DW Series duct / outside air dewpoint transmitter (BACnet MS/TP) — 7 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Greystone Energy Systems’s own free documentation, linked below.
- Manufacturer
- Greystone Energy Systems
- Model
- DW Series duct / outside air dewpoint transmitter (BACnet MS/TP)
- Equipment
- Duct / outdoor dewpoint and humidity sensor
- Equipment type
- Thermostats, sensors & meters
- BACnet objects
- 12 (7 writable)
- Transport
- BACnet MS/TP
- Firmware
- 1.0 (PICS, July 27, 2022)
- Also known as
- DW, DPDDB, DPODB, DWXXXBAC, Greystone duct dewpoint sensor, HTX2, HTX2XXXBAC, Greystone HTX2 high accuracy humidity transmitter
Reference only, provided as-is: verify against Greystone Energy Systems’s current documentation and the live device before use. Not official Greystone Energy Systems information. Terms of use.
BMS integration notes: Greystone Energy Systems DW Series duct / outside air dewpoint transmitter (BACnet MS/TP)
Set the MS/TP MAC and baud in the menu, set the altitude or barometric pressure for the site, then read dewpoint, temperature and RH.
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 3 | Dewpoint Temperature | Duct or outdoor dewpoint | Read |
| AI 1 | Temperature | Duct or outdoor air temperature | Read |
| AI 2 | Relative Humidity | Duct or outdoor RH | Read |
| AI 5 | Enthalpy | Air enthalpy, kJ/kg or BTU/lb | Read |
Network setup
- Device instance is 381000 + the MS/TP MAC set in the menu; it stops tracking the MAC once written over BACnet.
- MS/TP baud rates 9600-115200 are supported; Max_Master defaults to 127 and is writable.
Watch out for
- Atmospheric Pressure and Altitude are linked; set one to match the site so the psychrometric values are right.
- Enthalpy units follow the enthalpy unit BV (kJ/kg or BTU/lb); temperatures follow the temperature unit BV.
Greystone Energy Systems DW Series duct / outside air dewpoint 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 | Temperature | Temperature, -30 to 50 °C | °C / °F | Read | |
| AImin | 2 | Relative Humidity | Relative humidity, 0-100 % | %RH | Read | |
| AImin | 3 | Dewpoint Temperature | Calculated dewpoint | °C / °F | Read | |
| AI | 4 | Wet Bulb Temperature | Calculated wet bulb temperature | °C / °F | Read | |
| AImin | 5 | Enthalpy | Calculated enthalpy | kJ/kg / BTU/lb | Read | |
| AV | 1 | Temperature Offset | Temperature offset, ±5 Δ°C or ±10 Δ°F (default 0) | delta °C / °F | Write | |
| AV | 2 | RH Offset | RH offset, ±10 %RH (default 0) | %RH | Write | |
| AV | 3 | Atmospheric Pressure | Barometric pressure for calculations, 812-1013 hPa (default 1013) | hPa | Write | |
| AV | 4 | Altitude | Altitude, 0-6000 ft (default 0); linked to AV 3 | ft | Write | |
| BV | 1 | Temperature Unit | Temperature unit select | Write | 0=°C, 1=°F | |
| BV | 2 | Enthalpy Unit | Enthalpy unit select | Write | 0=kJ/kg, 1=BTU/lb | |
| MV | 1 | Display Mode | LCD display selection (default 1) | Write | 1=Dew Point T, 2=Temperature, 3=Wet Bulb T, 4=RH, 5=Enthalpy, 6=T+dewpoint, 7=T+wet bulb, 8=T+RH, 9=T+enthalpy, 10=Dewpoint+wet bulb, 11=Dewpoint+RH, 12=Dewpoint+enthalpy, 13=Wet bulb+RH, 14=Wet bulb+enthalpy, 15=RH+enthalpy |
No points match these filters.
Object ID lookup: Greystone Energy Systems DW Series duct / outside air dewpoint transmitter point IDs by name
Integration notes
- Points from the object table on page 2 of the setup guide.
- The object pages spell BV 1 and BV 2 as "Temperature Units" and "Enthalpy Units"; the table uses the singular.
- The guide gives the default device instance as 381001 in the table and 381003 in the text; check the unit.
- The HTX2 high-accuracy RH/T transmitter guide (SG-HTX2XXXBAC-001, PICS Nov 24, 2025, firmware 1.6, https://downloads.greystoneenergy.com/SG/SG-HTX2XXXBAC-001.pdf) prints the identical object list, so it is covered here.
- Multistate object is MSV 1 in the guide (listed here as MV). Access from the PICS: AV, BV and MSV Present_Value are writable.
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 DW Series duct / outside air dewpoint 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 Greystone Energy Systems DW Series duct / outside air dewpoint transmitter (BACnet MS/TP)
How many BACnet points does the Greystone Energy Systems DW Series duct / outside air dewpoint transmitter (BACnet MS/TP) have?
This list has 12 BACnet objects: 5 analog inputs, 4 analog values, 2 binary values, 1 multi-state value. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Greystone Energy Systems DW Series duct / outside air dewpoint transmitter (BACnet MS/TP) BACnet points are writable?
7 of the 12 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 Greystone Energy Systems DW Series duct / outside air dewpoint transmitter (BACnet MS/TP) BACnet documentation?
The source is DW Series Dewpoint Transmitter - Setup Guide BACnet Communication (SG-DWXXXBAC-002), revision 2022-07-27 (PICS date), published free by Greystone Energy Systems at https://downloads.greystoneenergy.com/SG/SG-DWXXXBAC-002.pdf.
What are the minimum BACnet points to integrate the Greystone Energy Systems DW Series duct / outside air dewpoint transmitter (BACnet MS/TP)?
Start with AI 3 Dewpoint Temperature (Duct or outdoor dewpoint); AI 1 Temperature (Duct or outdoor air temperature); AI 2 Relative Humidity (Duct or outdoor RH); AI 5 Enthalpy (Air enthalpy, kJ/kg or BTU/lb).
How do I check these points on the real DW Series duct / outside air dewpoint 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 Greystone Energy Systems BACnet points lists
- CO2 sensor / transmitter
Greystone Energy Systems CDD3 Series CO2 transmitter (BACnet MS/TP)
Greystone CDD3 series room CO2 transmitters with the BACnet MS/TP output, with optional RH, temperature, relay and setpoint.
Also known as: CDD3, CDD3A1XXXBAC, CDD3 BACnet, Greystone CDD3 CO2 - CO2 / RH / temperature sensor
Greystone Energy Systems CHT Series CO2 / RH / temperature sensor (BACnet MS/TP)
Greystone CHT series combined CO2, humidity and temperature sensors with the BACnet MS/TP output.
Also known as: CHT, CHTDT, CHTXXXBAC, Greystone CHT - Carbon monoxide (CO) gas sensor / transmitter
Greystone Energy Systems CMD Series CO transmitter (BACnet MS/TP)
Greystone CMD series carbon monoxide transmitters (model name CMD5B) with BACnet MS/TP, with optional relays, buzzer and temperature.
Also known as: CMD, CMD5B, CMDXXXBAC, Greystone CMD carbon monoxide - Room temperature / RH / differential pressure monitor
Greystone Energy Systems CR3 Series cleanroom monitor (BACnet MS/TP)
Greystone CR3 series cleanroom and critical-room monitors measuring temperature, humidity and room differential pressure, with BACnet MS/TP.
Also known as: CR3, CR3XXXBAC, CR3C, Greystone CR3 critical room monitor - Room dewpoint / humidity sensor
Greystone Energy Systems DPRC Series room dewpoint transmitter (BACnet MS/TP)
Greystone DPRC series room dewpoint transmitters (PICS model DPRCB) with BACnet MS/TP.
Also known as: DPRC, DPRCB, DPRCXXXBAC, Greystone room dewpoint sensor - Gas detector / sensor (CO and NO2)
Greystone Energy Systems GDT Series toxic gas detector, CO / NO2 (BACnet MS/TP)
Greystone GDT series toxic gas detectors with CO and/or NO2 sensors, relays, buzzer and strobe, using BACnet MS/TP (typical for parking garages).
Also known as: GDT, GDTXXXBAC, GS, Greystone CO NO2 gas detector, parking garage gas detector - Greenhouse CO2 / RH / temperature sensor
Greystone Energy Systems GH Series horticulture sensor (BACnet MS/TP)
Greystone GH series horticulture (greenhouse / grow room) sensors measuring temperature, humidity and CO2, with BACnet MS/TP.
Also known as: GH, GHXXXBAC, Greystone greenhouse CO2 RH temperature sensor - Greenhouse CO2 sensor
Greystone Energy Systems GO3 Series horticulture CO2 sensor (BACnet MS/TP)
Greystone GO3 series horticulture CO2 sensors (0-20,000 ppm) with optional temperature, RH and relay, using BACnet MS/TP.
Also known as: GO3, GO3 BACnet, Greystone GO3 greenhouse CO2 - Humidity / temperature sensor
Greystone Energy Systems HN Series humidity / temperature transmitter (BACnet MS/TP)
Greystone HN series humidity and temperature transmitters with BACnet MS/TP and an optional relay.
Also known as: HN, HNXXXBAC, Greystone HN humidity sensor - Humidity / temperature sensor with condensation monitoring
Greystone Energy Systems HTX1 Series rough duty RH / temperature transmitter (BACnet MS/TP)
Greystone HTX1 series rough-duty RH/temperature transmitters (PICS model DP0011) with optional pipe-temperature condensation probe, digital input and relay, using BACnet MS/TP.
Also known as: HTX1, HTX1XXXBAC, DP0011, NPI-56, Greystone rough duty sensor - Indoor air quality multi-sensor (CO2 / PM / VOC / formaldehyde)
Greystone Energy Systems IAQRM Series multi-sensor (BACnet MS/TP)
Greystone IAQRM series room multi-sensors (PICS model MSN) measuring temperature, RH, CO2, VOC, particulates and formaldehyde, with BACnet MS/TP.
Also known as: IAQRM, MSN, IAQRMXXXBAC, Greystone indoor air quality multi sensor - Room temperature / humidity sensor
Greystone Energy Systems NTRC Series temperature / humidity room sensor (BACnet MS/TP)
Greystone NTRC series network room sensors (temperature, optional RH, setpoint, fan switch, override, relay and digital input) with BACnet MS/TP.
Also known as: NTRC, NTRCXXXBAC, STAT, Greystone NTRC network room sensor - Particulate matter (PM2.5 / PM10) sensor
Greystone Energy Systems PM Series particulate matter transmitter (BACnet MS/TP)
Greystone PM series particulate transmitters for room, duct and outdoor mounting (PMRMC, PMDT, PMOS) with BACnet MS/TP.
Also known as: PM Series, PMRMC, PMDT, PMOS, PMXXXBAC, Greystone particulate sensor - Room differential pressure sensor / monitor
Greystone Energy Systems RPC Series room pressure sensor (BACnet MS/TP)
Greystone RPC series room pressure monitors with local alarm buzzer and BACnet MS/TP.
Also known as: RPC, RPCXXXBAC, Greystone room pressure monitor - Ultra-low differential pressure sensor / transducer
Greystone Energy Systems UP Series ultra-low pressure transducer (BACnet MS/TP)
Greystone UP series ultra-low differential pressure transducers with BACnet MS/TP.
Also known as: UP, UPB, UPXXXBAC, Greystone ultra low differential pressure - VOC air quality sensor
Greystone Energy Systems VOC Series air quality transmitter (BACnet MS/TP)
Greystone VOC series room air quality transmitters (VOC with RH and temperature) with BACnet MS/TP and optional relay.
Also known as: VOC Series, VOCXXXBAC, Greystone VOC sensor, Greystone TVOC transmitter
Source: DW Series Dewpoint Transmitter - Setup Guide BACnet Communication · SG-DWXXXBAC-002 · rev. 2022-07-27 (PICS date). Object names, instances and units are reproduced as published; descriptions are our own.