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Carbon monoxide (CO) gas sensor / transmitter · BACnet points list
Greystone Energy Systems CMD Series CO transmitter (BACnet MS/TP) BACnet points list
Updated 6 November 2026
The CMD is a Greystone carbon monoxide transmitter with native BACnet MS/TP. It reports CO and temperature as Analog Inputs, buzzer and relay settings and timers as Analog Values, enables, resets and relay action as Binary Values, and alarm, relay and fault states as Binary Inputs.
This page lists 32 BACnet objects for the Greystone Energy Systems CMD Series CO transmitter (BACnet MS/TP) — 24 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
- CMD Series CO transmitter (BACnet MS/TP)
- Equipment
- Carbon monoxide (CO) gas sensor / transmitter
- Equipment type
- Thermostats, sensors & meters
- BACnet objects
- 32 (24 writable)
- Transport
- BACnet MS/TP
- Firmware
- 1.2 (PICS, Feb 15, 2016)
- Default device instance
- 381004
- Also known as
- CMD, CMD5B, CMDXXXBAC, Greystone CMD carbon monoxide
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 CMD Series CO transmitter (BACnet MS/TP)
Set the MS/TP MAC and baud in the local menu, then read CO (AI 1) and the alarm and fault BIs. Relay and buzzer setpoints are stored settings, set once.
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 | CO Sensor Value | Space CO, ppm | Read |
| BI 3 | Relay 1 Status | Relay 1 (fan or alarm stage) active | Read |
| BI 4 | Relay 2 Status | Relay 2 active (if fitted) | Read |
| BI 1 | CO Status | Any CO alarm present | Read |
| BI 6 | Fault Status | Sensor fault / end-of-life alarm | Read |
Network setup
- Factory defaults are MAC address 4 and 9600 baud, set in the local menu; supported baud 9600-76800.
- Device instance defaults to 381000 + MAC (381004); it stops tracking the MAC once written over BACnet.
- Set Max_Master to the highest MAC on the segment instead of the default 127.
Watch out for
- Poll every 5-10 s; faster polling congests the MS/TP segment.
- Fault Mode Time and ReCal Mode Time are multi-year timers; reset them with BV 3 and BV 8 after service.
Greystone Energy Systems CMD Series CO 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 | CO Sensor Value | CO concentration | ppm | Read | |
| AI | 2 | Temperature | Temperature; units follow BV 9 (space models only) | °C / °F | Read | |
| AV | 1 | Buzzer Setpoint | Buzzer alarm level, 20-500 ppm (default 150) | ppm | Write | |
| AV | 2 | Buzzer Delay | Buzzer delay, 0-10 min (default 5) | min | Write | |
| AV | 3 | Relay 1 Setpoint | Relay 1 trip level, 20-500 ppm (default 50) | ppm | Write | |
| AV | 4 | Relay 1 Hysteresis | Relay 1 hysteresis, 10-100 ppm (default 10) | ppm | Write | |
| AV | 5 | Relay 1 Delay | Relay 1 delay, 0-10 min (default 2) | min | Write | |
| AV | 6 | Relay 2 Setpoint | Relay 2 trip level, 20-500 ppm (default 150) | ppm | Write | |
| AV | 7 | Relay 2 Hysteresis | Relay 2 hysteresis, 10-100 ppm (default 20) | ppm | Write | |
| AV | 8 | Relay 2 Delay | Relay 2 delay, 0-10 min (default 2) | min | Write | |
| AV | 9 | Test Mode Time | Test mode duration, 1-15 min (default 5) | min | Write | |
| AV | 10 | Output Test | Output test selection, 0-6 (default 0) | Write | ||
| AV | 11 | Fault Mode Time | Sensor-life fault timer: 3, 4, 5 or 6 years (default 3) | years | Write | |
| AV | 12 | ReCal Mode Time | Recalibration reminder: 1, 2 or 3 years (default 1) | years | Write | |
| AV | 13 | Temperature Offset | Temperature calibration offset (default 0) | delta °C / °F | Write | |
| BV | 1 | Buzzer Enable/Disable | Buzzer enable (normally 1) | Write | 0=Disabled, 1=Enabled | |
| BV | 2 | Fault Mode Enable/Disable | Sensor-life fault alarm enable (normally 0) | Write | 0=Disabled, 1=Enabled | |
| BV | 3 | Fault Mode Reset | Write 1 to reset the fault mode and its timer | Write | 0=Normal, 1=Reset | |
| BV | 4 | Display Mode | Show CO on the LCD (0 hides the reading) | Write | 0=Suppress CO reading, 1=Show | |
| BV | 5 | Backlight Enable/Disable | LCD backlight enable (normally 1) | Write | 0=Disabled, 1=Enabled | |
| BV | 6 | Test Mode Enable/Disable | Write 1 to start test mode | Write | 0=Off, 1=Test mode | |
| BV | 7 | ReCal Mode Enable/Disable | Recalibration reminder alarm enable (normally 1) | Write | 0=Disabled, 1=Enabled | |
| BV | 8 | ReCal Mode Reset | Write 1 to reset the recal reminder and its timer | Write | 0=Normal, 1=Reset | |
| BV | 9 | Temperature Units | Temperature unit select | Write | 0=°C, 1=°F | |
| BV | 10 | Relay 1 Operation | Relay 1 action | Write | 0=Direct, 1=Reverse | |
| BV | 11 | Relay 2 Operation | Relay 2 action | Write | 0=Direct, 1=Reverse | |
| BImin | 1 | CO Status | Any alarm present | Read | 0=Normal, 1=Alarm | |
| BI | 2 | Buzzer Status | Buzzer active | Read | 0=Off, 1=Active | |
| BImin | 3 | Relay 1 Status | Relay 1 active | Read | 0=Off, 1=Active | |
| BImin | 4 | Relay 2 Status | Relay 2 active | Read | 0=Off, 1=Active | |
| BI | 5 | Test Mode Status | Test mode running | Read | 0=Off, 1=Active | |
| BImin | 6 | Fault Status | Fault alarm active | Read | 0=Normal, 1=Fault |
No points match these filters.
Object ID lookup: Greystone Energy Systems CMD Series CO transmitter point IDs by name
AI1CO Sensor ValueAI2TemperatureAV1Buzzer SetpointAV2Buzzer DelayAV3Relay 1 SetpointAV4Relay 1 HysteresisAV5Relay 1 DelayAV6Relay 2 SetpointAV7Relay 2 HysteresisAV8Relay 2 DelayAV9Test Mode TimeAV10Output TestAV11Fault Mode TimeAV12ReCal Mode TimeAV13Temperature OffsetBV1Buzzer Enable/DisableBV2Fault Mode Enable/DisableBV3Fault Mode ResetBV4Display ModeBV5Backlight Enable/DisableBV6Test Mode Enable/DisableBV7ReCal Mode Enable/DisableBV8ReCal Mode ResetBV9Temperature UnitsBV10Relay 1 OperationBV11Relay 2 OperationBI1CO StatusBI2Buzzer StatusBI3Relay 1 StatusBI4Relay 2 StatusBI5Test Mode StatusBI6Fault Status
Integration notes
- Points from the object summary table on page 1 of the setup guide; the object pages print most names with underscores (e.g. Buzzer_Setpoint).
- Relay 2 objects do nothing when the second relay is not fitted.
- The guide says the BACnet port is for reading values and changing parameters only, not for running control logic; there are no event objects.
- AI 2 is only valid on space models mounted flat on a wall; it does not give duct temperature on duct models.
- The guide does not list what each Output Test value (0-6) does.
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 CMD Series CO 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 CMD Series CO transmitter (BACnet MS/TP)
How many BACnet points does the Greystone Energy Systems CMD Series CO transmitter (BACnet MS/TP) have?
This list has 32 BACnet objects: 2 analog inputs, 13 analog values, 6 binary inputs, 11 binary values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Greystone Energy Systems CMD Series CO transmitter (BACnet MS/TP) BACnet points are writable?
24 of the 32 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 CMD Series CO transmitter (BACnet MS/TP) BACnet documentation?
The source is CMD Series Carbon Monoxide Transmitter - Setup Guide BACnet Communication (SG-CMDXXXBAC-01-01), revision 05/19, published free by Greystone Energy Systems at https://downloads.greystoneenergy.com/Website%20Documents/CMD/SG-CMDXXXBAC.pdf.
What are the minimum BACnet points to integrate the Greystone Energy Systems CMD Series CO transmitter (BACnet MS/TP)?
Start with AI 1 CO Sensor Value (Space CO, ppm); BI 3 Relay 1 Status (Relay 1 (fan or alarm stage) active); BI 4 Relay 2 Status (Relay 2 active (if fitted)); BI 1 CO Status (Any CO alarm present); BI 6 Fault Status (Sensor fault / end-of-life alarm).
How do I check these points on the real CMD Series CO 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 - 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 - 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: CMD Series Carbon Monoxide Transmitter - Setup Guide BACnet Communication · SG-CMDXXXBAC-01-01 · rev. 05/19. Object names, instances and units are reproduced as published; descriptions are our own.