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Greenhouse CO2 / RH / temperature sensor · BACnet points list
Greystone Energy Systems GH Series horticulture sensor (BACnet MS/TP) BACnet points list
Updated 6 November 2026
The GH is a Greystone grow-room sensor for temperature, RH and CO2 with native BACnet MS/TP. The three readings are Analog Inputs; offsets and two configurable alarms (setpoint, hysteresis, delay) are Analog Values, and Multi-State Values assign each alarm to CO2, temperature or RH high/low and set the display.
This page lists 21 BACnet objects for the Greystone Energy Systems GH Series horticulture sensor (BACnet MS/TP) — 16 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
- GH Series horticulture sensor (BACnet MS/TP)
- Equipment
- Greenhouse CO2 / RH / temperature sensor
- Equipment type
- Thermostats, sensors & meters
- BACnet objects
- 21 (16 writable)
- Transport
- BACnet MS/TP
- Firmware
- 1.4 (PICS, March 6, 2019)
- Default device instance
- 381003
- Also known as
- GH, GHXXXBAC, Greystone greenhouse CO2 RH temperature 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 GH Series horticulture sensor (BACnet MS/TP)
Set the MS/TP MAC in the menu, then read temperature, RH and CO2 (AI 1-3). If the relays drive equipment, set the alarm assignment and setpoint once and monitor the alarm BIs.
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 | CO2 | Room CO2, ppm | Read |
| AI 1 | Temperature | Room temperature | Read |
| AI 2 | Relative Humidity | Room RH | Read |
| BI 1 | Alarm 1 Status | Alarm / relay 1 active | Read |
| BI 2 | Alarm 2 Status | Alarm / relay 2 active | Read |
Network setup
- Device instance defaults to 381003 (381000 + MAC 3); it stops following the MAC once written over BACnet.
- MAC address and baud are set in the local menu.
Watch out for
- Relay test BVs force the relay on and stay there until written back to 0.
- Change MV 3/MV 4 before the alarm setpoints: the allowed setpoint range depends on the assignment.
Greystone Energy Systems GH Series horticulture 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 | Temperature, 0-50 °C | °C / °F | Read | |
| AImin | 2 | Relative Humidity | Relative humidity, 0-100 % | %RH | Read | |
| AImin | 3 | CO2 | CO2, 0-5000 ppm | ppm | Read | |
| AV | 1 | Temperature Offset | Temperature offset, ±5 Δ°C (default 0) | delta °C / °F | Write | |
| AV | 2 | RH Offset | RH offset, ±10 %RH (default 0) | %RH | Write | |
| AV | 3 | CO2 Offset | CO2 offset, ±300 ppm in 50 ppm steps (default 0) | ppm | Write | |
| AV | 4 | Alarm 1 Setpoint | Alarm 1 trip point; range depends on MV 3 assignment | Write | ||
| AV | 5 | Alarm 1 Hysteresis | Alarm 1 hysteresis; range depends on MV 3 assignment | Write | ||
| AV | 6 | Alarm 1 Delay | Alarm 1 delay, 0-255 s (default 15) | s | Write | |
| AV | 7 | Alarm 2 Setpoint | Alarm 2 trip point; range depends on MV 4 assignment | Write | ||
| AV | 8 | Alarm 2 Hysteresis | Alarm 2 hysteresis; range depends on MV 4 assignment | Write | ||
| AV | 9 | Alarm 2 Delay | Alarm 2 delay, 0-255 s (default 15) | s | Write | |
| BV | 1 | Temperature Units | Temperature unit select | Write | 0=°C, 1=°F | |
| BV | 2 | Relay 1 Test | Forces relay 1 on; set back to 0 after test | Write | 0=Normal, 1=Test | |
| BV | 3 | Relay 2 Test | Forces relay 2 on; set back to 0 after test | Write | 0=Normal, 1=Test | |
| BImin | 1 | Alarm 1 Status | Alarm 1 active | Read | 0=Normal, 1=Alarm | |
| BImin | 2 | Alarm 2 Status | Alarm 2 active | Read | 0=Normal, 1=Alarm | |
| MV | 1 | LCD Backlight | LCD backlight mode (default Auto) | Write | 1=Auto, 2=Off, 3=On | |
| MV | 2 | LCD Display | Values shown on the LCD (default All) | Write | 1=All, 2=RH, 3=Temp, 4=CO2, 5=RH/Temp, 6=RH/CO2, 7=Temp/CO2, 8=None | |
| MV | 3 | Alarm 1 Assignment | What alarm 1 / relay 1 watches (default CO2 High) | Write | 1=CO2 High, 2=CO2 Low, 3=Temp High, 4=Temp Low, 5=RH High, 6=RH Low | |
| MV | 4 | Alarm 2 Assignment | What alarm 2 / relay 2 watches (default CO2 High) | Write | 1=CO2 High, 2=CO2 Low, 3=Temp High, 4=Temp Low, 5=RH High, 6=RH Low |
No points match these filters.
Object ID lookup: Greystone Energy Systems GH Series horticulture sensor point IDs by name
AI1TemperatureAI2Relative HumidityAI3CO2AV1Temperature OffsetAV2RH OffsetAV3CO2 OffsetAV4Alarm 1 SetpointAV5Alarm 1 HysteresisAV6Alarm 1 DelayAV7Alarm 2 SetpointAV8Alarm 2 HysteresisAV9Alarm 2 DelayBV1Temperature UnitsBV2Relay 1 TestBV3Relay 2 TestBI1Alarm 1 StatusBI2Alarm 2 StatusMV1LCD BacklightMV2LCD DisplayMV3Alarm 1 AssignmentMV4Alarm 2 Assignment
Integration notes
- Points from the object table on page 1 of the setup guide.
- The alarm setpoint and hysteresis ranges and defaults change with the alarm assignment (e.g. CO2 High 600-4000 ppm, default 1500; Temp High 10-40 °C, default 30).
- Relay objects report a fault when the relay option is not fitted.
- Multistate objects are MSV 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 GH Series horticulture 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 GH Series horticulture sensor (BACnet MS/TP)
How many BACnet points does the Greystone Energy Systems GH Series horticulture sensor (BACnet MS/TP) have?
This list has 21 BACnet objects: 3 analog inputs, 9 analog values, 2 binary inputs, 3 binary values, 4 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Greystone Energy Systems GH Series horticulture sensor (BACnet MS/TP) BACnet points are writable?
16 of the 21 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 GH Series horticulture sensor (BACnet MS/TP) BACnet documentation?
The source is GH Series Horticulture Sensor - Setup Guide BACnet Communication (SG-GHXXXBAC-01), revision 05/19, published free by Greystone Energy Systems at https://downloads.greystoneenergy.com/SG/SG-GHXXXBAC.pdf.
What are the minimum BACnet points to integrate the Greystone Energy Systems GH Series horticulture sensor (BACnet MS/TP)?
Start with AI 3 CO2 (Room CO2, ppm); AI 1 Temperature (Room temperature); AI 2 Relative Humidity (Room RH); BI 1 Alarm 1 Status (Alarm / relay 1 active); BI 2 Alarm 2 Status (Alarm / relay 2 active).
How do I check these points on the real GH Series horticulture 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 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: GH Series Horticulture Sensor - Setup Guide BACnet Communication · SG-GHXXXBAC-01 · rev. 05/19. Object names, instances and units are reproduced as published; descriptions are our own.