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Room temperature / humidity sensor · BACnet points list
Greystone Energy Systems NTRC Series temperature / humidity room sensor (BACnet MS/TP) BACnet points list
Updated 6 November 2026
The NTRC is a Greystone wall sensor with native BACnet MS/TP. It reports temperature, optional RH and the fan speed switch as Analog Inputs; the local setpoint, its limits, offsets and display/override settings are Analog Values; Binary Values carry units, override status and a BMS-controlled relay, and a Binary Input reports the digital input.
This page lists 19 BACnet objects for the Greystone Energy Systems NTRC Series temperature / humidity room sensor (BACnet MS/TP) — 15 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
- NTRC Series temperature / humidity room sensor (BACnet MS/TP)
- Equipment
- Room temperature / humidity sensor
- Equipment type
- Thermostats, sensors & meters
- BACnet objects
- 19 (15 writable)
- Transport
- BACnet MS/TP
- Firmware
- 1.3 (PICS, Oct 4, 2017)
- Default device instance
- 381003
- Also known as
- NTRC, NTRCXXXBAC, STAT, Greystone NTRC network room 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 NTRC Series temperature / humidity room sensor (BACnet MS/TP)
Set the MS/TP MAC in the menu, then read room temperature, RH, setpoint and override status. The BMS can switch the optional relay with BV 4 and must reset a latched override by writing 0 to BV 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 |
|---|---|---|---|
| BV 4 | Relay Enable | Relay command, 1 = on (relay option) | Write |
| AI 1 | Temperature | Room temperature | Read |
| AI 2 | Relative Humidity | Room RH (option) | Read |
| AV 1 | Setpoint | Occupant setpoint from the front panel | Write |
| AI 3 | Fan Speed | Fan switch: 0 Auto, 1 Off, 2-4 Low-High | Read |
| BV 3 | Override Status | Override pressed; write 0 to clear (latch) | Write |
Network setup
- Default MS/TP MAC is 3 and default baud 9600, both set in the Setup menu.
- Device instance defaults to 381003 (381000 + MAC); it stops following the MAC once written over BACnet.
- Lower Max_Master from 127 to the highest MAC on the segment.
Watch out for
- In latch mode (AV 7 = 0) the override stays on until the BMS writes 0 to BV 3.
- Writing BV 1 or BV 5 resets the setpoint limits to factory defaults.
- Poll every 5-10 s; faster polling congests the segment.
Greystone Energy Systems NTRC Series temperature / humidity room sensor (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 | Room temperature, 0.1° resolution | °C / °F | Read | |
| AImin | 2 | Relative Humidity | Room RH (RH option) | %RH | Read | |
| AImin | 3 | Fan Speed | Fan speed switch position (fan switch option) | Read | 0=Auto, 1=Off, 2=Low, 3=Med, 4=High | |
| AVmin | 1 | Setpoint | Front panel setpoint (temperature or RH per BV 5) | °C / °F / %RH | Write | |
| AV | 2 | Temperature Offset | Temperature offset, ±5 °C or ±10 °F (default 0) | delta °C / °F | Write | |
| AV | 3 | RH Offset | RH offset, ±10 %RH (default 0) | %RH | Write | |
| AV | 4 | Setpoint Minimum | Lowest allowed setpoint (default 5 °C / 41 °F / 40 %RH) | °C / °F / %RH | Write | |
| AV | 5 | Setpoint Maximum | Highest allowed setpoint (default 50 °C / 122 °F / 60 %RH) | °C / °F / %RH | Write | |
| AV | 6 | Display Mode | LCD display selection | Write | 0=No display, 1=Temperature only, 2=RH only, 3=Temperature and RH toggle | |
| AV | 7 | Override Mode | Override button behaviour (default 0) | Write | 0=LATCH, 1=TOGGLE, 2=MOMENTARY | |
| AV | 8 | Override Mode Time | Momentary override time, 1-60 min (default 1) | min | Write | |
| AV | 9 | Temperature Resolution | LCD temperature resolution (default 0) | Write | 0=1°, 1=0.5°, 2=0.1° | |
| BV | 1 | Temperature Units | Temperature unit select | Write | 0=°C, 1=°F | |
| BV | 2 | OCC Enable | Shows the OCC segment on the LCD | Write | 0=OCC Off, 1=OCC On | |
| BVmin | 3 | Override Status | Override button pressed; write 0 to reset in latch mode | Write | 0=Inactive, 1=Override | |
| BVmin | 4 | Relay Enable | Optional relay command | Write | 0=Relay Off, 1=Relay On | |
| BV | 5 | Setpoint Mode | What the front setpoint adjusts | Write | 0=Temperature, 1=%RH | |
| BV | 6 | Setpoint Resolution | Setpoint step size | Write | 0=1 degree, 1=0.5 degree | |
| BI | 1 | DI On | Digital input (DI models; active when pulled to common) | Read | 0=Inactive, 1=Active |
No points match these filters.
Object ID lookup: Greystone Energy Systems NTRC Series temperature / humidity room sensor point IDs by name
AI1TemperatureAI2Relative HumidityAI3Fan SpeedAV1SetpointAV2Temperature OffsetAV3RH OffsetAV4Setpoint MinimumAV5Setpoint MaximumAV6Display ModeAV7Override ModeAV8Override Mode TimeAV9Temperature ResolutionBV1Temperature UnitsBV2OCC EnableBV3Override StatusBV4Relay EnableBV5Setpoint ModeBV6Setpoint ResolutionBI1DI On
Integration notes
- Points from the object table on page 1 of the setup guide.
- RH, fan speed, setpoint, relay and DI objects only work when that option is fitted; otherwise they report NO_SENSOR / FAULT.
- Some object notes in the guide call the setpoint mode and resolution objects BV6 and BV7; the object table lists them as BV 5 and BV 6.
- Writing Temperature Units or Setpoint Mode resets Setpoint Minimum and Maximum to factory defaults, so set those first.
- BV 3 becomes read-only when AV 7 is set to toggle or momentary.
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 NTRC Series temperature / humidity room sensor (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 NTRC Series temperature / humidity room sensor (BACnet MS/TP)
How many BACnet points does the Greystone Energy Systems NTRC Series temperature / humidity room sensor (BACnet MS/TP) have?
This list has 19 BACnet objects: 3 analog inputs, 9 analog values, 1 binary input, 6 binary values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Greystone Energy Systems NTRC Series temperature / humidity room sensor (BACnet MS/TP) BACnet points are writable?
15 of the 19 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 NTRC Series temperature / humidity room sensor (BACnet MS/TP) BACnet documentation?
The source is Temperature/Humidity Sensor NTRC Series - Setup Guide BACnet Communication (SG-NTRCXXXBAC-003), revision 2017-10-04 (PICS date), published free by Greystone Energy Systems at https://downloads.greystoneenergy.com/SG/SG-NTRCXXXBAC-003.pdf.
What are the minimum BACnet points to integrate the Greystone Energy Systems NTRC Series temperature / humidity room sensor (BACnet MS/TP)?
Start with BV 4 Relay Enable (Relay command, 1 = on (relay option)); AI 1 Temperature (Room temperature); AI 2 Relative Humidity (Room RH (option)); AV 1 Setpoint (Occupant setpoint from the front panel); AI 3 Fan Speed (Fan switch: 0 Auto, 1 Off, 2-4 Low-High); BV 3 Override Status (Override pressed; write 0 to clear (latch)).
How do I check these points on the real NTRC Series temperature / humidity room sensor (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 - 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 - 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 - 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: Temperature/Humidity Sensor NTRC Series - Setup Guide BACnet Communication · SG-NTRCXXXBAC-003 · rev. 2017-10-04 (PICS date). Object names, instances and units are reproduced as published; descriptions are our own.