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Humidity / temperature sensor with condensation monitoring · BACnet points list
Greystone Energy Systems HTX1 Series rough duty RH / temperature transmitter (BACnet MS/TP) BACnet points list
Updated 6 November 2026
The HTX1 is a Greystone rough-duty RH and temperature transmitter with native BACnet MS/TP. It reports temperature, RH, dewpoint, wet bulb, enthalpy, absolute humidity and pipe temperature as Analog Inputs; Analog Values handle offset or 2-point calibration, altitude and the relay setpoints and timers; Multi-State Values assign the relay source, and Multi-State Inputs give relay status and error codes.
This page lists 46 BACnet objects for the Greystone Energy Systems HTX1 Series rough duty RH / temperature transmitter (BACnet MS/TP) — 33 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
- HTX1 Series rough duty RH / temperature transmitter (BACnet MS/TP)
- Equipment
- Humidity / temperature sensor with condensation monitoring
- Equipment type
- Thermostats, sensors & meters
- BACnet objects
- 46 (33 writable)
- Transport
- BACnet MS/TP
- Firmware
- 1.0 (PICS, 2025/7/8)
- Default device instance
- 381001
- Also known as
- HTX1, HTX1XXXBAC, DP0011, NPI-56, Greystone rough duty sensor
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 HTX1 Series rough duty RH / temperature transmitter (BACnet MS/TP)
Set the MS/TP MAC in the menu, then read temperature, RH and dewpoint. If the relay is to be switched by the BMS, set MV 2 to Free Control by BACnet and write BV 11.
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 |
|---|---|---|---|
| BV 11 | Relay Controlled by BACnet | Relay command from BMS (MV 2 must be 1) | Write |
| MV 2 | Relay Assignment | Relay source; 1 = BACnet control | Write |
| MI 1 | Relay Status | Relay state and trigger source | Read |
| AI 1 | Temperature | Air temperature | Read |
| AI 2 | Relative Humidity | Air RH | Read |
| AI 3 | Dewpoint Temperature | Calculated dewpoint | Read |
| BI 2 | Condensation Status | Condensation detected on the pipe probe | Read |
| MI 2 | Generic Error Codes | Probe communication error | Read |
Enable & remote start
The relay follows BV 11 only when Relay Assignment (MV 2) is set to 1, Free Control by BACnet.
Network setup
- Device instance defaults to 381000 + MAC; it stops following the MAC once written over BACnet.
- Choose metric or imperial units for all values with BV 1.
Watch out for
- Set MV 2 before writing relay setpoints; their units and limits depend on the assignment.
- Writing 1 to BV 9 restores factory settings.
- 2-point calibration points must be at least 5 °C (temperature) or 20 %RH apart.
Greystone Energy Systems HTX1 Series rough duty RH / temperature 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, -20 to 60 °C | °C / °F | Read | |
| AImin | 2 | Relative Humidity | Relative humidity, 0-100 % | %RH | Read | |
| AImin | 3 | Dewpoint Temperature | Dewpoint, -30 to 60 °C | °C / °F | Read | |
| AI | 4 | Wet Bulb Temperature | Wet bulb temperature, -20 to 60 °C | °C / °F | Read | |
| AI | 5 | Enthalpy | Enthalpy | kJ/kg / BTU/lb | Read | |
| AI | 6 | Absolute Humidity | Absolute humidity, 0-130 g/m3 | g/m3 / lb/ft3 | Read | |
| AI | 7 | Pipe Temperature | Pipe temperature from the condensation probe | °C / °F | Read | |
| AV | 1 | Temperature Offset | Temperature offset, ±5 °C (default 0) | delta °C / °F | Write | |
| AV | 2 | T Calibration Point1 | Temperature 2-point calibration, point 1 (default 25 °C) | °C / °F | Write | |
| AV | 3 | T Calibration Value on Point1 | Correction at temperature point 1 (default 0) | delta °C / °F | Write | |
| AV | 4 | T Calibration Point2 | Temperature 2-point calibration, point 2 (default 30 °C) | °C / °F | Write | |
| AV | 5 | T Calibration Value on Point2 | Correction at temperature point 2 (default 0) | delta °C / °F | Write | |
| AV | 6 | RH Offset | RH offset, ±20 %RH (default 0) | %RH | Write | |
| AV | 7 | RH Calibration Point1 | RH 2-point calibration, point 1 (default 40 %RH) | %RH | Write | |
| AV | 8 | RH Calibration Value on Point1 | Correction at RH point 1 (default 0) | %RH | Write | |
| AV | 9 | RH Calibration Point2 | RH 2-point calibration, point 2 (default 60 %RH) | %RH | Write | |
| AV | 10 | RH Calibration Value on Point2 | Correction at RH point 2 (default 0) | %RH | Write | |
| AV | 11 | Altitude | Altitude, 0-3500 m or 0-11,500 ft (default 0) | m / ft | Write | |
| AV | 12 | Relay Low Setpoint | Relay low setpoint; units and range follow MV 2 | Write | ||
| AV | 13 | Relay High Setpoint | Relay high setpoint; units and range follow MV 2 | Write | ||
| AV | 14 | Relay Hysteresis | Relay hysteresis; units and range follow MV 2 | Write | ||
| AV | 15 | Relay On Time | Relay on delay, 0-3600 s | s | Write | |
| AV | 16 | Relay Off Time | Relay off delay, 0-3600 s (default 0) | s | Write | |
| AV | 17 | Relay Contact Time (for DI only) | Relay hold time when driven by the DI, 10-3600 s | s | Write | |
| BV | 1 | Units Select | Unit system | Write | 0=Metric, 1=Imperial | |
| BV | 2 | Temperature Display Enable | Show temperature on the LCD | Write | 0=Invisible, 1=Visible | |
| BV | 3 | RH Display Enable | Show RH on the LCD | Write | 0=Invisible, 1=Visible | |
| BV | 4 | DP Display Enable | Show dewpoint on the LCD | Write | 0=Invisible, 1=Visible | |
| BV | 5 | WB Display Enable | Show wet bulb on the LCD | Write | 0=Invisible, 1=Visible | |
| BV | 6 | EN Display Enable | Show enthalpy on the LCD | Write | 0=Invisible, 1=Visible | |
| BV | 7 | AH Display Enable | Show absolute humidity on the LCD | Write | 0=Invisible, 1=Visible | |
| BV | 8 | Pipe Temperature Display Enable | Show pipe temperature on the LCD | Write | 0=Invisible, 1=Visible | |
| BV | 9 | Factory Restore | Write 1 to restore factory settings | Write | 0=Normal, 1=Restore | |
| BV | 10 | Relay Direct | Relay action | Write | 0=Direct, 1=Reverse | |
| BVmin | 11 | Relay Controlled by BACnet | Relay command when MV 2 = Free Control by BACnet | Write | 0=Relay OFF, 1=Relay ON | |
| BV | 12 | Relay Test | Forces the relay on for testing | Write | 0=OFF, 1=ON | |
| BI | 1 | DI Status | Digital input (active when pulled to common) | Read | 0=Inactive, 1=Active | |
| BImin | 2 | Condensation Status | Condensation detected | Read | 0=Inactive, 1=Active | |
| MV | 1 | Backlight Select | LCD backlight mode (default Auto) | Write | 0=Auto, 1=ON, 2=OFF | |
| MVmin | 2 | Relay Assignment | Source that drives the relay (default 0) | Write | 0=No Assignment, 1=Free Control by BACnet, 2=DI, 3=Temperature, 4=RH, 5=Dew Point, 6=Wet Bulb, 7=Enthalpy, 8=Absolute Humidity, 9=Condensation | |
| MV | 3 | T(Probe) Adjust Method | Temperature calibration method (default None) | Write | 0=None, 1=Offset, 2=2-point | |
| MV | 4 | RH(Probe) Adjust Method | RH calibration method (default None) | Write | 0=None, 1=Offset, 2=2-point | |
| MImin | 1 | Relay Status | Relay state and what turned it on | Read | 0=OFF, 1=ON by BACnet, 2=ON by DI, 3=ON in test, 4=ON low setpoint alarm, 5=ON high setpoint alarm, 6=ON condensation alarm | |
| MImin | 2 | Generic Error Codes | Probe communication error | Read | 0=No Error, 1=Probe Comm Error | |
| MI | 3 | Communication Error Codes | Communication error code | Read | 0=No Error, 1=Unknown | |
| MI | 4 | Condensation Error Codes | Condensation monitoring error | Read | 0=No Error, 1=Pipe T Sensor not Connected, 2=Other |
No points match these filters.
Object ID lookup: Greystone Energy Systems HTX1 Series rough duty RH / temperature transmitter point IDs by name
AI1TemperatureAI2Relative HumidityAI3Dewpoint TemperatureAI4Wet Bulb TemperatureAI5EnthalpyAI6Absolute HumidityAI7Pipe TemperatureAV1Temperature OffsetAV2T Calibration Point1AV3T Calibration Value on Point1AV4T Calibration Point2AV5T Calibration Value on Point2AV6RH OffsetAV7RH Calibration Point1AV8RH Calibration Value on Point1AV9RH Calibration Point2AV10RH Calibration Value on Point2AV11AltitudeAV12Relay Low SetpointAV13Relay High SetpointAV14Relay HysteresisAV15Relay On TimeAV16Relay Off TimeAV17Relay Contact Time (for DI only)BV1Units SelectBV2Temperature Display EnableBV3RH Display EnableBV4DP Display EnableBV5WB Display EnableBV6EN Display EnableBV7AH Display EnableBV8Pipe Temperature Display EnableBV9Factory RestoreBV10Relay DirectBV11Relay Controlled by BACnetBV12Relay TestBI1DI StatusBI2Condensation StatusMV1Backlight SelectMV2Relay AssignmentMV3T(Probe) Adjust MethodMV4RH(Probe) Adjust MethodMI1Relay StatusMI2Generic Error CodesMI3Communication Error CodesMI4Condensation Error Codes
Integration notes
- Points from the object table on page 1 of the setup guide. The guide pages carry an SG-DWXXXBAC-002 footer, but the cover and table are for the HTX1.
- Relay setpoint and hysteresis ranges, units and defaults change with Relay Assignment (MV 2), e.g. RH low 20 %RH / high 70 %RH by default.
- With MV 2 = Condensation the relay turns on when pipe temperature minus dewpoint drops below the setpoint.
- Absolute humidity in lb/ft3 uses a Greystone-specific units code (257), not a standard BACnet unit.
- Multistate objects are MSV and MSI in the guide; listed here as MV and MI.
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 HTX1 Series rough duty RH / temperature 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 HTX1 Series rough duty RH / temperature transmitter (BACnet MS/TP)
How many BACnet points does the Greystone Energy Systems HTX1 Series rough duty RH / temperature transmitter (BACnet MS/TP) have?
This list has 46 BACnet objects: 7 analog inputs, 17 analog values, 2 binary inputs, 12 binary values, 4 multi-state inputs, 4 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Greystone Energy Systems HTX1 Series rough duty RH / temperature transmitter (BACnet MS/TP) BACnet points are writable?
33 of the 46 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 HTX1 Series rough duty RH / temperature transmitter (BACnet MS/TP) BACnet documentation?
The source is Rough Duty Sensor (NPI-56) RH/T Transmitter - Setup Guide BACnet Communication (HTX1 Series) (SG-HTX1XXXBAC-001), revision 2025-07-08 (PICS date), published free by Greystone Energy Systems at https://downloads.greystoneenergy.com/SG/SG-HTX1XXXBAC-001.pdf.
What are the minimum BACnet points to integrate the Greystone Energy Systems HTX1 Series rough duty RH / temperature transmitter (BACnet MS/TP)?
Start with BV 11 Relay Controlled by BACnet (Relay command from BMS (MV 2 must be 1)); MV 2 Relay Assignment (Relay source; 1 = BACnet control); MI 1 Relay Status (Relay state and trigger source); AI 1 Temperature (Air temperature); AI 2 Relative Humidity (Air RH); AI 3 Dewpoint Temperature (Calculated dewpoint); BI 2 Condensation Status (Condensation detected on the pipe probe); MI 2 Generic Error Codes (Probe communication error).
How do I enable BMS control of the Greystone Energy Systems HTX1 Series rough duty RH / temperature transmitter (BACnet MS/TP)?
The relay follows BV 11 only when Relay Assignment (MV 2) is set to 1, Free Control by BACnet.
How do I check these points on the real HTX1 Series rough duty RH / temperature 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
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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 - Duct / outdoor dewpoint and humidity sensor
Greystone Energy Systems DW Series duct / outside air dewpoint transmitter (BACnet MS/TP)
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.
Also known as: DW, DPDDB, DPODB, DWXXXBAC, Greystone duct dewpoint sensor, HTX2, HTX2XXXBAC, Greystone HTX2 high accuracy humidity transmitter - 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 - 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: Rough Duty Sensor (NPI-56) RH/T Transmitter - Setup Guide BACnet Communication (HTX1 Series) · SG-HTX1XXXBAC-001 · rev. 2025-07-08 (PICS date). Object names, instances and units are reproduced as published; descriptions are our own.