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VOC air quality sensor · BACnet points list
Greystone Energy Systems VOC Series air quality transmitter (BACnet MS/TP) BACnet points list
Updated 6 November 2026
The VOC Series is a Greystone room air quality transmitter with native BACnet MS/TP. VOC (as an index or ppb), RH and temperature are Analog Inputs; offsets and relay setpoint, hysteresis and delay are Analog Values; Binary Values set units, override, the TVOC clean-air reference and the Bluetooth link, and Multi-State Values assign the relay and the display.
This page lists 20 BACnet objects for the Greystone Energy Systems VOC Series air quality transmitter (BACnet MS/TP) — 14 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
- VOC Series air quality transmitter (BACnet MS/TP)
- Equipment
- VOC air quality sensor
- Equipment type
- Thermostats, sensors & meters
- BACnet objects
- 20 (14 writable)
- Transport
- BACnet MS/TP
- Firmware
- 1.0 (PICS, 19-Jul-21)
- Default device instance
- 381003
- Also known as
- VOC Series, VOCXXXBAC, Greystone VOC sensor, Greystone TVOC 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 VOC Series air quality transmitter (BACnet MS/TP)
Set the MS/TP MAC in the menu, pick VOC units with BV 1, then read VOC, RH and temperature. Treat -1000 as a sensor error.
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 1 | VOC Sensor Value | VOC index or TVOC ppb (per BV 1) | Read |
| AI 3 | Temperature Sensor Value | Room temperature | Read |
| AI 2 | RH Sensor Value | Room RH | Read |
| BI 2 | Override Status | Occupant override active | Read |
| BI 1 | Relay Status | Relay alarm active | Read |
Network setup
- Device instance defaults to 381003 (381000 + MAC); it stops following the MAC once written over BACnet.
- MS/TP baud rates 9600-115200 are supported.
Watch out for
- Only write BV 5 (new TVOC reference) when the air is known to be clean; the reading is reset to 50 ppb.
Greystone Energy Systems VOC Series air quality 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 | VOC Sensor Value | VOC: 0-500 index or 0-1000 ppb per BV 1 | VOC index / ppb | Read | |
| AImin | 2 | RH Sensor Value | Relative humidity, 0-100 % | %RH | Read | |
| AImin | 3 | Temperature Sensor Value | Temperature, 0-50 °C | °C / °F | Read | |
| AV | 1 | Temperature Offset | Temperature offset, ±5 Δ°C or ±10 Δ°F (default 0) | delta °C / °F | Write | |
| AV | 2 | Humidity Offset | RH offset, ±10 %RH (default 0) | %RH | Write | |
| AV | 3 | Relay Setpoint | Relay trip point; range follows MV 1 (default 20 VOC index) | Write | ||
| AV | 4 | Relay Hysterisis | Relay hysteresis; range follows MV 1 (default 20 VOC index) | Write | ||
| AV | 5 | Relay On Time | Relay on/off delay, 0-255 s (default 0) | s | Write | |
| BV | 1 | VOC Units | VOC reporting units | Write | 0=VOC Index, 1=TVOC ppb | |
| BV | 2 | Temperature Units | Temperature unit select | Write | 0=°C, 1=°F | |
| BV | 3 | Relay Test | Forces the relay for testing | Write | 0=Inactive, 1=Test | |
| BV | 4 | Set Overide | Override command | Write | 0=Inactive, 1=Active | |
| BV | 5 | Set New TVOC Reference | Write 1 in clean air to reset the TVOC reference (reads 50 ppb) | Write | 0=Inactive, 1=Active | |
| BV | 6 | Set Wireless Enable | Bluetooth (BLE) wireless link enable | Write | 0=Disable, 1=Enable | |
| BImin | 1 | Relay Status | Relay alarm state | Read | 0=Normal, 1=Alarm | |
| BImin | 2 | Override Status | Override active | Read | 0=Inactive, 1=Active | |
| BI | 3 | Wireless Connect Status | Bluetooth connection state | Read | 0=Disconnected, 1=Connected | |
| MV | 1 | Relay Assignment | Reading that drives the relay (default 1) | Write | 0=No Relay, 1=VOC, 2=RH, 3=Temperature | |
| MV | 2 | LCD Backlight | LCD backlight mode (default 1) | Write | 1=Auto, 2=Off, 3=On | |
| MV | 3 | LCD Format | Values shown on the LCD (default 1) | Write | 1=VOC Index, 2=RH, 3=Temperature, 4=VOC/T/RH |
No points match these filters.
Object ID lookup: Greystone Energy Systems VOC Series air quality transmitter point IDs by name
AI1VOC Sensor ValueAI2RH Sensor ValueAI3Temperature Sensor ValueAV1Temperature OffsetAV2Humidity OffsetAV3Relay SetpointAV4Relay HysterisisAV5Relay On TimeBV1VOC UnitsBV2Temperature UnitsBV3Relay TestBV4Set OverideBV5Set New TVOC ReferenceBV6Set Wireless EnableBI1Relay StatusBI2Override StatusBI3Wireless Connect StatusMV1Relay AssignmentMV2LCD BacklightMV3LCD Format
Integration notes
- Points from the object table on page 1 of the setup guide; names kept as printed (e.g. "Set Overide", "Relay Hysterisis").
- Each AI reads -1000 on a sensor error.
- Relay setpoint and hysteresis ranges follow MV 1, e.g. VOC index 100-500, TVOC 100-1000 ppb, RH 20-90 %RH, temperature 5-40 °C.
- 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 VOC Series air quality 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 VOC Series air quality transmitter (BACnet MS/TP)
How many BACnet points does the Greystone Energy Systems VOC Series air quality transmitter (BACnet MS/TP) have?
This list has 20 BACnet objects: 3 analog inputs, 5 analog values, 3 binary inputs, 6 binary values, 3 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Greystone Energy Systems VOC Series air quality transmitter (BACnet MS/TP) BACnet points are writable?
14 of the 20 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 VOC Series air quality transmitter (BACnet MS/TP) BACnet documentation?
The source is VOC Series Air Quality Transmitter - Setup Guide for BACnet Communication (SG-VOCXXXBAC-001), revision 2021-07-19 (PICS date), published free by Greystone Energy Systems at https://downloads.greystoneenergy.com/SG/SG-VOCXXXBAC-001.pdf.
What are the minimum BACnet points to integrate the Greystone Energy Systems VOC Series air quality transmitter (BACnet MS/TP)?
Start with AI 1 VOC Sensor Value (VOC index or TVOC ppb (per BV 1)); AI 3 Temperature Sensor Value (Room temperature); AI 2 RH Sensor Value (Room RH); BI 2 Override Status (Occupant override active); BI 1 Relay Status (Relay alarm active).
How do I check these points on the real VOC Series air quality 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 - 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 - 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
Source: VOC Series Air Quality Transmitter - Setup Guide for BACnet Communication · SG-VOCXXXBAC-001 · rev. 2021-07-19 (PICS date). Object names, instances and units are reproduced as published; descriptions are our own.