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Differential pressure and airflow sensor · BACnet points list
Dwyer Series MS2 Magnesense II Differential Pressure Transmitter with BACnet (MS2-B) BACnet points list
Updated 7 November 2026Unofficial source
The MS2 Magnesense II is a differential pressure transmitter with BACnet MS/TP. It reports pressure in four units as analog inputs and calculated velocity and flow as analog values, using a writable K factor and duct area. Binary values select the default K factor, start zero and span calibration and restore factory values.
This page lists 15 BACnet objects for the Dwyer Series MS2 Magnesense II Differential Pressure Transmitter with BACnet (MS2-B) — 6 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from a copy of Dwyer’s documentation hosted by Kele, not by Dwyer itself, so treat it as unofficial.
- Manufacturer
- Dwyer
- Model
- Series MS2 Magnesense II Differential Pressure Transmitter with BACnet (MS2-B)
- Equipment
- Differential pressure and airflow sensor
- Equipment type
- Thermostats, sensors & meters
- BACnet objects
- 15 (6 writable)
- Transport
- BACnet MS/TP
- Firmware
- Not stated
- Default device instance
- 607000 + MAC address (607xxx)
- Also known as
- MS2-B, MS2, Magnesense II, P-MS2-B
- Source document
- Series MS2 Magnesense II Differential Pressure Transmitter with BACnet Communication Protocol - Installation and Operating Instructions · Bulletin P-MS2-B · rev. 2018-06 (unofficial copy, hosted by Kele)
Reference only, provided as-is: verify against Dwyer’s current documentation and the live device before use. Not official Dwyer information. Terms of use.
BMS integration notes: Dwyer Series MS2 Magnesense II Differential Pressure Transmitter with BACnet (MS2-B)
Read the pressure in the unit you need (AI 1-4). For airflow, set BV 1 to 0, write the K value (AV 5) and duct area (AV 6), then read velocity or flow from AV 1-4.
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 | Pressure inWC | Differential pressure, inH2O | Read |
| AI 2 | Pressure Pascals | Differential pressure, Pa | Read |
| AV 3 | Flow CFM | Calculated airflow, CFM | Read |
| AV 7 | Sensor Present | Sensor type fitted (0 = no sensor) | Read |
Network setup
- Left DIP switch SW1 sets the MS/TP MAC address (factory 127); the baud rate auto-detects after power-up or an address change.
- Default device instance 607xxx (xxx = MAC); a device instance written over BACnet is kept even if the MAC changes.
- Changes to Max Master and Max Info Frames need a power cycle.
- DeviceCommunicationControl and ReinitializeDevice need the password "Dwyer".
Watch out for
- Span calibration (BV 3) only works within 5 minutes after a zero calibration (BV 2).
- BV 1 ships as 1 (default K factor and area); velocity and flow are only real units after it is set to 0.
Dwyer Series MS2 Magnesense II Differential Pressure Transmitter with BACnet (MS2-B) 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 | Pressure inWC | inH2O | Read | ||
| AImin | 2 | Pressure Pascals | Pa | Read | ||
| AI | 3 | Pressure Kilo-Pascals | kPa | Read | ||
| AI | 4 | Pressure mmWC | mmH2O | Read | ||
| AV | 1 | Velocity FPM | Calculated air velocity | fpm | Read | |
| AV | 2 | Velocity MPS | Calculated air velocity | m/s | Read | |
| AVmin | 3 | Flow CFM | Calculated air flow | CFM | Read | |
| AV | 4 | Flow CMH | Calculated air flow | m³/h | Read | |
| AV | 5 | Velocity K Value | Flow coefficient, 0-9.999 | Write | ||
| AV | 6 | Flow Area SqFt | Duct area, 0.01-999.99 | ft² | Write | |
| AVmin | 7 | Sensor Present | Pressure sensor type fitted; 0 indicates a sensor problem | Read | 0=No Sensor, 1=Hall, 2=Piezo, 3=Capcell | |
| BV | 1 | Use Default K Value | Use default K factor and area; set 0 to use AV 5 / AV 6 | Write | ||
| BV | 2 | Zero | Write 1 to start zero calibration | Write | ||
| BV | 3 | Span | Write 1 to start span calibration | Write | ||
| BV | 4 | Restore Factory Pressure Values | Write 1 to restore factory calibration values | Write |
No points match these filters.
Object ID lookup: Dwyer Series MS2 Magnesense II Differential Pressure Transmitter with point IDs by name
Integration notes
- Objects come from the manual object overview; access follows the object property tables in the appendices.
- Velocity and flow (AV 1-4) use the K value (AV 5) and flow area (AV 6) only when BV 1 is 0; otherwise they are scaled 0-1.0 of full scale.
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 Series MS2 Magnesense II Differential Pressure Transmitter with BACnet (MS2-B) 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 Dwyer Series MS2 Magnesense II Differential Pressure Transmitter with BACnet (MS2-B)
How many BACnet points does the Dwyer Series MS2 Magnesense II Differential Pressure Transmitter with BACnet (MS2-B) have?
This list has 15 BACnet objects: 4 analog inputs, 7 analog values, 4 binary values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Dwyer Series MS2 Magnesense II Differential Pressure Transmitter with BACnet (MS2-B) BACnet points are writable?
6 of the 15 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 Dwyer Series MS2 Magnesense II Differential Pressure Transmitter with BACnet (MS2-B) BACnet documentation?
Dwyer does not publish it on its own website. This list comes from Series MS2 Magnesense II Differential Pressure Transmitter with BACnet Communication Protocol - Installation and Operating Instructions (Bulletin P-MS2-B), revision 2018-06, a copy hosted by Kele at https://assets.kele.com/Catalog/19%20Pressure/PDFs/MS2%20Series%20Installation%20and%20Operating%20Instructions%20P-MS2-B.pdf. Ask Dwyer or its representative for the current revision.
What are the minimum BACnet points to integrate the Dwyer Series MS2 Magnesense II Differential Pressure Transmitter with BACnet (MS2-B)?
Start with AI 1 Pressure inWC (Differential pressure, inH2O); AI 2 Pressure Pascals (Differential pressure, Pa); AV 3 Flow CFM (Calculated airflow, CFM); AV 7 Sensor Present (Sensor type fitted (0 = no sensor)).
How do I check these points on the real Series MS2 Magnesense II Differential Pressure Transmitter with BACnet (MS2-B)?
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 Dwyer BACnet points lists
- CO2, humidity and temperature room sensor
Dwyer Series CDTA / CDTC Communicating CO2 Detector
Dwyer Series CDTA (CO2, humidity, temperature) and CDTC (CO2, temperature) wall-mount detectors with setpoint and override, BACnet MS/TP or Modbus RTU.
Also known as: CDTA, CDTC, CDTA-2N000, CDTA-5N000, CDTC-2N000, CDTC-5N000, CDTA-2N000-LCD - Differential pressure sensor / transmitter
Dwyer Series MSX-Comms Magnesense Pressure Transmitter
Dwyer Series MSX-Comms Magnesense differential pressure transmitters with BACnet MS/TP or Modbus RTU output.
Also known as: MSX, MSX-Comms, Magnesense MSX, DwyerOmega MSX, MSX BACnet - Room pressure monitor
Dwyer Series RSME / RSMC Room Status Monitor
Dwyer Series RSME/RSMC room status monitors (built-in differential pressure plus universal and external BACnet inputs) for isolation rooms, labs and cleanrooms.
Also known as: RSME, RSMC, Series RSME, Series RSMC, DwyerOmega RSME, Dwyer room pressure monitor - Ultrasonic BTU / energy meter
Dwyer Series TUF ultrasonic energy meter, BACnet MS/TP (TUF-B)
Dwyer Series TUF ultrasonic heating/cooling energy meters (TUF-150 to TUF-2000) ordered with BACnet MS/TP.
Also known as: TUF, TUF-B, TUF BACnet, Dwyer TUF BTU meter, DwyerOmega TUF
Source: Series MS2 Magnesense II Differential Pressure Transmitter with BACnet Communication Protocol - Installation and Operating Instructions · Bulletin P-MS2-B · rev. 2018-06. Object names, instances and units are reproduced as published; descriptions are our own.