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Room temperature / RH / differential pressure monitor · BACnet points list
Greystone Energy Systems CR3 Series cleanroom monitor (BACnet MS/TP) BACnet points list
Updated 6 November 2026
The CR3 is a Greystone room monitor that measures temperature, RH and room differential pressure and talks native BACnet MS/TP. Nine Analog Inputs give the readings and their min/max values; Analog Values hold the low/high alarm setpoints, their allowed ranges, hysteresis and delays; Binary Inputs carry the six alarm states; Binary and Multi-State Values set units, display, outputs, alarms and menu locks.
This page lists 81 BACnet objects for the Greystone Energy Systems CR3 Series cleanroom monitor (BACnet MS/TP) — 65 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
- CR3 Series cleanroom monitor (BACnet MS/TP)
- Equipment
- Room temperature / RH / differential pressure monitor
- Equipment type
- Thermostats, sensors & meters
- BACnet objects
- 81 (65 writable)
- Transport
- BACnet MS/TP
- Firmware
- 1.05 (PICS, August 16, 2021)
- Default device instance
- 381003
- Also known as
- CR3, CR3XXXBAC, CR3C, Greystone CR3 critical room monitor
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 CR3 Series cleanroom monitor (BACnet MS/TP)
Set the MS/TP MAC in the menu, then read temperature, RH and DP (AI 1-3) and the alarm BIs. Set alarm setpoints and enable alarms with MV 1-3 once at commissioning.
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 | Differential Pressure (DP) | Room differential pressure, Pa or mmWc | Read |
| AI 1 | Temperature (TEMP) | Room temperature | Read |
| AI 2 | Relative Humidity (RH) | Room RH | Read |
| BI 6 | DP Alarm Low Status | Low room pressure alarm | Read |
| BI 7 | DP Alarm High Status | High room pressure alarm | Read |
| BI 2 | TEMP Alarm Low Status | Low temperature alarm | Read |
| BI 3 | TEMP Alarm High Status | High temperature alarm | Read |
| BI 5 | RH Alarm High Status | High RH alarm | 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; MAC and baud are set in the local menu.
Watch out for
- Alarm setpoints are rejected if they fall outside their Min/Max limit AVs.
- Only run DP Auto Zero (BV 3) when the room pressure is near zero; the guide limits it to readings within 20 % of range.
- Writing 1 to BV 27 clears all the min/max AIs at once.
Greystone Energy Systems CR3 Series cleanroom monitor (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 (TEMP) | Room temperature, 0-50 °C | °C / °F | Read | |
| AImin | 2 | Relative Humidity (RH) | Room RH, 0-100 % | %RH | Read | |
| AImin | 3 | Differential Pressure (DP) | Room differential pressure, ±500 Pa | Pa / mmWc | Read | |
| AI | 4 | TEMP Minimum | Lowest temperature since last BV 27 reset | °C / °F | Read | |
| AI | 5 | TEMP Maximum | Highest temperature since last BV 27 reset | °C / °F | Read | |
| AI | 6 | RH Minimum | Lowest RH since last BV 27 reset | %RH | Read | |
| AI | 7 | RH Maximum | Highest RH since last BV 27 reset | %RH | Read | |
| AI | 8 | DP Minimum | Lowest DP since last BV 27 reset | Pa / mmWc | Read | |
| AI | 9 | DP Maximum | Highest DP since last BV 27 reset | Pa / mmWc | Read | |
| AV | 1 | TEMP 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 | TEMP Alarm Low Setpoint | Low temperature alarm (default 15 °C), within AV 4-5 | °C / °F | Write | |
| AV | 4 | TEMP Low Setpoint Min | Lower limit for the low temp alarm setpoint | °C / °F | Write | |
| AV | 5 | TEMP Low Setpoint Max | Upper limit for the low temp alarm setpoint | °C / °F | Write | |
| AV | 6 | TEMP Alarm High Setpoint | High temperature alarm (default 25 °C), within AV 7-8 | °C / °F | Write | |
| AV | 7 | TEMP High Setpoint Min | Lower limit for the high temp alarm setpoint | °C / °F | Write | |
| AV | 8 | TEMP High Setpoint Max | Upper limit for the high temp alarm setpoint | °C / °F | Write | |
| AV | 9 | TEMP Alarm Hysteresis | Temperature alarm hysteresis, 0-1 Δ°C (default 0.2) | delta °C / °F | Write | |
| AV | 10 | TEMP Alarm On Delay | Temperature alarm delay, 0-255 s (default 5) | s | Write | |
| AV | 11 | RH Alarm Low Setpoint | Low RH alarm (default 30 %RH), within AV 12-13 | %RH | Write | |
| AV | 12 | RH Low Setpoint Min | Lower limit for the low RH alarm setpoint | %RH | Write | |
| AV | 13 | RH Low Setpoint Max | Upper limit for the low RH alarm setpoint | %RH | Write | |
| AV | 14 | RH Alarm High Setpoint | High RH alarm (default 65 %RH), within AV 15-16 | %RH | Write | |
| AV | 15 | RH High Setpoint Min | Lower limit for the high RH alarm setpoint | %RH | Write | |
| AV | 16 | RH High Setpoint Max | Upper limit for the high RH alarm setpoint | %RH | Write | |
| AV | 17 | RH Alarm Hysteresis | RH alarm hysteresis, 0-5 %RH (default 2) | %RH | Write | |
| AV | 18 | RH Alarm On Delay | RH alarm delay, 0-255 s (default 15) | s | Write | |
| AV | 19 | DP Alarm Low Setpoint | Low DP alarm (default 0 Pa), within AV 20-21 | Pa / mmWc | Write | |
| AV | 20 | DP Low Setpoint Min | Lower limit for the low DP alarm setpoint | Pa / mmWc | Write | |
| AV | 21 | DP Low Setpoint Max | Upper limit for the low DP alarm setpoint | Pa / mmWc | Write | |
| AV | 22 | DP Alarm High Setpoint | High DP alarm (default 200 Pa), within AV 23-24 | Pa / mmWc | Write | |
| AV | 23 | DP High Setpoint Min | Lower limit for the high DP alarm setpoint | Pa / mmWc | Write | |
| AV | 24 | DP High Setpoint Max | Upper limit for the high DP alarm setpoint | Pa / mmWc | Write | |
| AV | 25 | DP Alarm Hysteresis | DP alarm hysteresis, 0-50 Pa (default 5) | Pa / mmWc | Write | |
| AV | 26 | DP Alarm On Delay | DP alarm delay, 0-255 s (default 10) | s | Write | |
| AV | 27 | Buzzer Auto Reset Time | Buzzer auto reset time, 5-255 s (default 15) | s | Write | |
| AV | 28 | Analog Out TEMP Override | Temperature output value when overridden, 0-100 % | % | Write | |
| AV | 29 | Analog Out RH Override | RH output value when overridden, 0-100 % | % | Write | |
| AV | 30 | Analog Out DP Override | DP output value when overridden, 0-100 % | % | Write | |
| AV | 31 | Digital Input Self-reset Time | Digital input self-reset time, 1-255 s (default 30) | s | Write | |
| AV | 32 | DP Low Range | DP range low end, -500 to 0 Pa (default -500) | Pa / mmWc | Write | |
| AV | 33 | DP High Range | DP range high end, 0 to 500 Pa (default 500) | Pa / mmWc | Write | |
| BI | 1 | Digital Input | Digital input state | Read | 0=Inactive, 1=Active | |
| BImin | 2 | TEMP Alarm Low Status | Low temperature alarm | Read | 0=No alarm, 1=Alarm | |
| BImin | 3 | TEMP Alarm High Status | High temperature alarm | Read | 0=No alarm, 1=Alarm | |
| BI | 4 | RH Alarm Low Status | Low RH alarm | Read | 0=No alarm, 1=Alarm | |
| BImin | 5 | RH Alarm High Status | High RH alarm | Read | 0=No alarm, 1=Alarm | |
| BImin | 6 | DP Alarm Low Status | Low DP alarm | Read | 0=No alarm, 1=Alarm | |
| BImin | 7 | DP Alarm High Status | High DP alarm | Read | 0=No alarm, 1=Alarm | |
| BV | 1 | TEMP Units | Temperature units | Write | 0=°C, 1=°F | |
| BV | 2 | DP Units | Pressure units | Write | 0=Pa, 1=mmWc | |
| BV | 3 | DP Auto Zero | Write 1 to auto-zero the DP sensor | Write | 0=Normal Operation, 1=Perform Auto Zero | |
| BV | 4 | TEMP Response Time | Temperature response speed | Write | 0=Fast, 1=Slow | |
| BV | 5 | RH Response Time | RH response speed | Write | 0=Fast, 1=Slow | |
| BV | 6 | DP Response Time | DP response speed | Write | 0=Fast, 1=Slow | |
| BV | 7 | TEMP Display | Show temperature on the display | Write | 0=Off, 1=On | |
| BV | 8 | RH Display | Show RH on the display | Write | 0=Off, 1=On | |
| BV | 9 | DP Display | Show DP on the display | Write | 0=Off, 1=On | |
| BV | 10 | TEMP Out Direction | Temperature analog output action | Write | 0=Direct, 1=Reverse | |
| BV | 11 | RH Out Direction | RH analog output action | Write | 0=Direct, 1=Reverse | |
| BV | 12 | DP Out Direction | DP analog output action | Write | 0=Direct, 1=Reverse | |
| BV | 13 | Analog Output Override | Puts the analog outputs on the AV 28-30 values | Write | 0=Normal, 1=Override | |
| BV | 14 | Buzzer Reset | Buzzer reset mode (default 1) | Write | 0=Manual Only, 1=Manual + Automatic | |
| BV | 15 | Alarm Acknowledge | Alarm acknowledge | Write | 0=Normal, 1=Alarm Acknowledged | |
| BV | 16 | Digital Input Mode | Digital input status latch mode (default 1) | Write | 0=Latch, 1=Momentary Self-reset | |
| BV | 17 | Digital Input Status | Latched digital input; write 0 to clear | Write | 0=Inactive, 1=Active | |
| BV | 18 | Setpoint Lock | Locks setpoints on the local display | Write | 0=Not Locked, 1=Locked | |
| BV | 19 | User Menu Lock | Locks the user menu | Write | 0=Not Locked, 1=Locked | |
| BV | 20 | Installer Menu Lock | Locks the installer menu | Write | 0=Not Locked, 1=Locked | |
| BV | 21 | Display Brightness | Display brightness | Write | 0=Low, 1=High | |
| BV | 22 | TEMP Analog Input Range | Temperature range (default 0-50 °C) | Write | 0=0-35 °C (32-95 °F), 1=0-50 °C (32-122 °F) | |
| BV | 23 | Analog Input Signal Type | Analog input signal type | Write | 0=mA, 1=Voltage | |
| BV | 24 | Analog Input Volt Range | Analog input voltage range | Write | 0=0-5 V, 1=0-10 V | |
| BV | 25 | Analog Output Signal Type | Analog output signal type | Write | 0=mA, 1=Voltage | |
| BV | 26 | Analog Output Volt Range | Analog output voltage range | Write | 0=0-5 V, 1=0-10 V | |
| BV | 27 | Min Max Reset | Write 1 to reset all min/max values | Write | 0=Normal, 1=Reset all values | |
| MV | 1 | TEMP Alarm Operation | Temperature alarm mode (default Disable) | Write | 1=Low Alrm, 2=High Alrm, 3=Both, 4=Disable | |
| MV | 2 | RH Alarm Operation | RH alarm mode (default Disable) | Write | 1=Low Alrm, 2=High Alrm, 3=Both, 4=Disable | |
| MV | 3 | DP Alarm Operation | DP alarm mode (default Both) | Write | 1=Low Alrm, 2=High Alrm, 3=Both, 4=Disable | |
| MV | 4 | Buzzer Assignment | Which alarm sounds the buzzer (default DP) | Write | 1=TEMP, 2=RH, 3=DP, 4=Disable, 5=All | |
| MV | 5 | Digital Input Function | Digital input function (default Disable) | Write | 1=Disable, 2=Freeze, 3=Silence |
No points match these filters.
Object ID lookup: Greystone Energy Systems CR3 Series cleanroom monitor point IDs by name
AI1Temperature (TEMP)AI2Relative Humidity (RH)AI3Differential Pressure (DP)AI4TEMP MinimumAI5TEMP MaximumAI6RH MinimumAI7RH MaximumAI8DP MinimumAI9DP MaximumAV1TEMP OffsetAV2RH OffsetAV3TEMP Alarm Low SetpointAV4TEMP Low Setpoint MinAV5TEMP Low Setpoint MaxAV6TEMP Alarm High SetpointAV7TEMP High Setpoint MinAV8TEMP High Setpoint MaxAV9TEMP Alarm HysteresisAV10TEMP Alarm On DelayAV11RH Alarm Low SetpointAV12RH Low Setpoint MinAV13RH Low Setpoint MaxAV14RH Alarm High SetpointAV15RH High Setpoint MinAV16RH High Setpoint MaxAV17RH Alarm HysteresisAV18RH Alarm On DelayAV19DP Alarm Low SetpointAV20DP Low Setpoint MinAV21DP Low Setpoint MaxAV22DP Alarm High SetpointAV23DP High Setpoint MinAV24DP High Setpoint MaxAV25DP Alarm HysteresisAV26DP Alarm On DelayAV27Buzzer Auto Reset TimeAV28Analog Out TEMP OverrideAV29Analog Out RH OverrideAV30Analog Out DP OverrideAV31Digital Input Self-reset TimeAV32DP Low RangeAV33DP High RangeBI1Digital InputBI2TEMP Alarm Low StatusBI3TEMP Alarm High StatusBI4RH Alarm Low StatusBI5RH Alarm High StatusBI6DP Alarm Low StatusBI7DP Alarm High StatusBV1TEMP UnitsBV2DP UnitsBV3DP Auto ZeroBV4TEMP Response TimeBV5RH Response TimeBV6DP Response TimeBV7TEMP DisplayBV8RH DisplayBV9DP DisplayBV10TEMP Out DirectionBV11RH Out DirectionBV12DP Out DirectionBV13Analog Output OverrideBV14Buzzer ResetBV15Alarm AcknowledgeBV16Digital Input ModeBV17Digital Input StatusBV18Setpoint LockBV19User Menu LockBV20Installer Menu LockBV21Display BrightnessBV22TEMP Analog Input RangeBV23Analog Input Signal TypeBV24Analog Input Volt RangeBV25Analog Output Signal TypeBV26Analog Output Volt RangeBV27Min Max ResetMV1TEMP Alarm OperationMV2RH Alarm OperationMV3DP Alarm OperationMV4Buzzer AssignmentMV5Digital Input Function
Integration notes
- Points from the object summary table on pages 2-3 of the setup guide.
- Temperature objects follow BV 1 (°C or °F) and pressure objects follow BV 2 (Pa or mmWc).
- Each alarm setpoint must sit between its Min and Max limit AVs; the limits themselves must stay a minimum span apart (e.g. 4 °C for temperature).
- Alarms do nothing until MV 1-3 enable them; by default only the DP alarms (MV 3 = Both) are on.
- Multistate objects are Multi-State Values (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 CR3 Series cleanroom monitor (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 CR3 Series cleanroom monitor (BACnet MS/TP)
How many BACnet points does the Greystone Energy Systems CR3 Series cleanroom monitor (BACnet MS/TP) have?
This list has 81 BACnet objects: 9 analog inputs, 33 analog values, 7 binary inputs, 27 binary values, 5 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Greystone Energy Systems CR3 Series cleanroom monitor (BACnet MS/TP) BACnet points are writable?
65 of the 81 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 CR3 Series cleanroom monitor (BACnet MS/TP) BACnet documentation?
The source is CR3 Series Cleanroom Monitor - Setup Guide: BACnet Communication (SG-CR3XXXBAC-002), revision 2021-08-16 (PICS date), published free by Greystone Energy Systems at https://downloads.greystoneenergy.com/SG/SG-CR3XXXBAC-002.pdf.
What are the minimum BACnet points to integrate the Greystone Energy Systems CR3 Series cleanroom monitor (BACnet MS/TP)?
Start with AI 3 Differential Pressure (DP) (Room differential pressure, Pa or mmWc); AI 1 Temperature (TEMP) (Room temperature); AI 2 Relative Humidity (RH) (Room RH); BI 6 DP Alarm Low Status (Low room pressure alarm); BI 7 DP Alarm High Status (High room pressure alarm); BI 2 TEMP Alarm Low Status (Low temperature alarm); BI 3 TEMP Alarm High Status (High temperature alarm); BI 5 RH Alarm High Status (High RH alarm).
How do I check these points on the real CR3 Series cleanroom monitor (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 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: CR3 Series Cleanroom Monitor - Setup Guide: BACnet Communication · SG-CR3XXXBAC-002 · rev. 2021-08-16 (PICS date). Object names, instances and units are reproduced as published; descriptions are our own.