{
 "manufacturer": "Greystone Energy Systems",
 "manufacturer_slug": "greystone",
 "model": "DW Series duct / outside air dewpoint transmitter (BACnet MS/TP)",
 "model_slug": "dw-dewpoint-transmitter",
 "aliases": [
  "DW",
  "DPDDB",
  "DPODB",
  "DWXXXBAC",
  "Greystone duct dewpoint sensor",
  "HTX2",
  "HTX2XXXBAC",
  "Greystone HTX2 high accuracy humidity transmitter"
 ],
 "equipment_type": "Duct / outdoor dewpoint and humidity sensor",
 "applies_to": "Greystone DW series duct and outside-air dewpoint transmitters (PICS models DPDDB and DPODB) and HTX2 high-accuracy RH/T transmitters with BACnet MS/TP.",
 "summary": "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.",
 "bacnet_transport": [
  "BACnet MS/TP"
 ],
 "firmware": "1.0 (PICS, July 27, 2022)",
 "default_device_instance": null,
 "access_inferred": false,
 "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."
 ],
 "source": {
  "title": "DW Series Dewpoint Transmitter - Setup Guide BACnet Communication",
  "doc_number": "SG-DWXXXBAC-002",
  "revision_date": "2022-07-27 (PICS date)",
  "url": "https://downloads.greystoneenergy.com/SG/SG-DWXXXBAC-002.pdf"
 },
 "integration": {
  "summary": "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": [
   {
    "ref": "AI 3",
    "name": "Dewpoint Temperature",
    "why": "Duct or outdoor dewpoint"
   },
   {
    "ref": "AI 1",
    "name": "Temperature",
    "why": "Duct or outdoor air temperature"
   },
   {
    "ref": "AI 2",
    "name": "Relative Humidity",
    "why": "Duct or outdoor RH"
   },
   {
    "ref": "AI 5",
    "name": "Enthalpy",
    "why": "Air enthalpy, kJ/kg or BTU/lb"
   }
  ],
  "enable": null,
  "heartbeat": null,
  "remote_sensors": null,
  "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."
  ],
  "gotchas": [
   "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."
  ]
 },
 "points": [
  {
   "type": "AI",
   "instance": 1,
   "name": "Temperature",
   "description": "Temperature, -30 to 50 °C",
   "units": "°C / °F",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 2,
   "name": "Relative Humidity",
   "description": "Relative humidity, 0-100 %",
   "units": "%RH",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 3,
   "name": "Dewpoint Temperature",
   "description": "Calculated dewpoint",
   "units": "°C / °F",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 4,
   "name": "Wet Bulb Temperature",
   "description": "Calculated wet bulb temperature",
   "units": "°C / °F",
   "access": "R",
   "states": ""
  },
  {
   "type": "AI",
   "instance": 5,
   "name": "Enthalpy",
   "description": "Calculated enthalpy",
   "units": "kJ/kg / BTU/lb",
   "access": "R",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 1,
   "name": "Temperature Offset",
   "description": "Temperature offset, ±5 Δ°C or ±10 Δ°F (default 0)",
   "units": "delta °C / °F",
   "access": "W",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 2,
   "name": "RH Offset",
   "description": "RH offset, ±10 %RH (default 0)",
   "units": "%RH",
   "access": "W",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 3,
   "name": "Atmospheric Pressure",
   "description": "Barometric pressure for calculations, 812-1013 hPa (default 1013)",
   "units": "hPa",
   "access": "W",
   "states": ""
  },
  {
   "type": "AV",
   "instance": 4,
   "name": "Altitude",
   "description": "Altitude, 0-6000 ft (default 0); linked to AV 3",
   "units": "ft",
   "access": "W",
   "states": ""
  },
  {
   "type": "BV",
   "instance": 1,
   "name": "Temperature Unit",
   "description": "Temperature unit select",
   "units": "",
   "access": "W",
   "states": "0=°C, 1=°F"
  },
  {
   "type": "BV",
   "instance": 2,
   "name": "Enthalpy Unit",
   "description": "Enthalpy unit select",
   "units": "",
   "access": "W",
   "states": "0=kJ/kg, 1=BTU/lb"
  },
  {
   "type": "MV",
   "instance": 1,
   "name": "Display Mode",
   "description": "LCD display selection (default 1)",
   "units": "",
   "access": "W",
   "states": "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"
  }
 ],
 "page": "https://easybacnet.com/bacnet-points-lists/greystone/dw-dewpoint-transmitter",
 "note": "Provided as-is. Point availability varies by firmware and options; verify against the live device.",
 "disclaimer": "DISCLAIMER: reference only, provided AS IS with no warranty. May contain errors or be out of date. You must verify every point against the manufacturer's current documentation and the live device before use. easybacnet.com accepts no liability for its use and is not affiliated with the manufacturer. Terms: https://easybacnet.com/terms#content"
}