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Differential pressure sensor / controller · BACnet points list
Dwyer Series DHC Digihelic differential pressure controller, BACnet MS/TP BACnet points list
Updated 12 November 2026
The DHC Digihelic is a differential pressure gauge, transmitter and two-relay controller that can also show velocity or flow. Its RS-485 port runs Modbus RTU (factory setting) or BACnet MS/TP, picked in the Conn menu. Over BACnet it exposes pressure, derived velocity and flow, peak and valley, and all set point, alarm, relay and external input settings as writable objects.
This page lists 37 BACnet objects for the Dwyer Series DHC Digihelic differential pressure controller, BACnet MS/TP — 29 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Dwyer’s own free documentation, linked below.
- Manufacturer
- Dwyer
- Model
- Series DHC Digihelic differential pressure controller, BACnet MS/TP
- Equipment
- Differential pressure sensor / controller
- Equipment type
- Thermostats, sensors & meters
- BACnet objects
- 37 (29 writable)
- Transport
- BACnet MS/TP
- Firmware
- Not stated
- Default device instance
- 607000 + MS/TP address (607xxx)
- Also known as
- DHC, Series DHC, Digihelic, Digihelic DHC, DwyerOmega DHC, DHC-xxx-xxx
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 DHC Digihelic differential pressure controller, BACnet MS/TP
Pick BAC in the Prot sub menu, set an address, then read AI 1 pressure (or AV 1 / AV 2 velocity and flow). Set point, alarm and relay settings are all writable over the network if the BMS should own them.
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 |
|---|---|---|---|
| AV 9 | Set Point 1 Trigger Value | Set point 1 trigger value, process units | Write |
| AI 1 | Pressure | Differential pressure | Read |
| AV 2 | Flow | Airflow (flow mode) | Read |
| BV 2 | Set Point 1 Status | Set point 1 active | Read |
| BV 4 | Set Point 2 Status | Set point 2 active | Read |
| BV 6 | Alarm High Limit Status | High alarm active | Write |
| BV 8 | Alarm Low Limit Status | Low alarm active | Write |
Network setup
- Protocol is Modbus RTU from the factory; choose BAC in Conn > Prot to use BACnet MS/TP.
- Address range 0-127, factory 127; baud 9600 to 115200 or auto (factory). Parity and stop bits are fixed at none and 1 on BACnet.
- Device instance and device name default to 607xxx and follow the address until written over the network.
- DeviceCommunicationControl and ReinitializeDevice need the password "Dwyer".
Watch out for
- Peak and valley (AV 3-4) cannot be reset over the network.
- Alarm status BVs can only be written inactive when Manual Alarm Reset (BV 9) is on and the condition has cleared.
- A change of bus serial settings needs a power cycle to rerun auto serial configuration.
Dwyer Series DHC Digihelic differential pressure controller, 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 | Pressure | Differential pressure; units model specific | Read | ||
| AV | 1 | Velocity | Velocity from pressure; fpm or m/s | Read | ||
| AVmin | 2 | Flow | Flow from velocity and area; cfm or m3/h | Read | ||
| AV | 3 | Peak | Highest process value since power-up or reset | Read | ||
| AV | 4 | Valley | Lowest process value since power-up or reset | Read | ||
| AV | 5 | Velocity K-Factor | Pitot tube K-factor, default 1.0 | Write | ||
| AV | 6 | Flow Area | Duct cross-section area, 0.13-25.0 ft2 | ft² | Write | |
| AV | 7 | Process Output Low | Process value at minimum analog output | Write | ||
| AV | 8 | Process Output High | Process value at maximum analog output | Write | ||
| AVmin | 9 | Set Point 1 Trigger Value | Value at which set point 1 turns active | Write | ||
| AV | 10 | Set Point 1 Reset Value | Value at which set point 1 turns inactive | Write | ||
| AV | 11 | Set Point 2 Trigger Value | Value at which set point 2 turns active | Write | ||
| AV | 12 | Set Point 2 Reset Value | Value at which set point 2 turns inactive | Write | ||
| AV | 13 | Alarm High Limit | High alarm limit | Write | ||
| AV | 14 | Alarm Low Limit | Low alarm limit | Write | ||
| MV | 1 | Process Mode | Process variable for outputs and limits | Write | 1=Pressure, 2=Velocity, 3=Flow | |
| MV | 2 | Voltage Output Range | Voltage output range | Write | 1=0-10V, 2=0-5V, 3=2-10V, 4=1-5 | |
| MV | 3 | Relay 1 Source | What drives relay 1 | Write | 1=Off, 2=Set Point 1, 3=Set Point 2, 4=Any Alarm, 5=Alarm High Limit, 6=Alarm Low Limit, 7=External Input | |
| MV | 4 | Relay 1 Action | Relay 1 action when active | Write | 1=Direct, 2=Reverse | |
| MV | 5 | Relay 2 Source | What drives relay 2 | Write | 1=Off, 2=Set Point 1, 3=Set Point 2, 4=Any Alarm, 5=Alarm High Limit, 6=Alarm Low Limit, 7=External Input | |
| MV | 6 | Relay 2 Action | Relay 2 action when active | Write | 1=Direct, 2=Reverse | |
| MV | 7 | External Input Type | Contact type on the external input | Write | 1=Normally Open, 2=Normally Closed | |
| BV | 1 | Enable Set Point 1 | Enable set point 1 | Write | 0=Inactive, 1=Active | |
| BVmin | 2 | Set Point 1 Status | Set point 1 active | Read | 0=Inactive, 1=Active | |
| BV | 3 | Enable Set Point 2 | Enable set point 2 | Write | 0=Inactive, 1=Active | |
| BVmin | 4 | Set Point 2 Status | Set point 2 active | Read | 0=Inactive, 1=Active | |
| BV | 5 | Enable Alarm High Limit | Enable high alarm | Write | 0=Inactive, 1=Active | |
| BVmin | 6 | Alarm High Limit Status | High alarm active; write inactive to reset (manual reset mode) | Write | 0=Inactive, 1=Active | |
| BV | 7 | Enable Alarm Low Limit | Enable low alarm | Write | 0=Inactive, 1=Active | |
| BVmin | 8 | Alarm Low Limit Status | Low alarm active; write inactive to reset (manual reset mode) | Write | 0=Inactive, 1=Active | |
| BV | 9 | Manual Alarm Reset | Alarms latch until reset when active | Write | 0=Inactive, 1=Active | |
| BV | 10 | Power Up Alarm Inhibit | Low alarm held off until value first rises above limit | Write | 0=Inactive, 1=Active | |
| BV | 11 | Enable External Input | Enable the external input | Write | 0=Inactive, 1=Active | |
| BV | 12 | External Input Status | External input active | Read | 0=Inactive, 1=Active | |
| PIV | 1 | Alarm Delay | Time an alarm condition must last, max 3600 | Write | ||
| PIV | 2 | External Input Activation Delay | Time the input must be on before active, max 3600 | Write | ||
| PIV | 3 | Damping Time | Measurement damping, 0-30 s; 0 = off | s | Write |
No points match these filters.
Object ID lookup: Dwyer Series DHC Digihelic differential pressure controller, BACnet MS/TP point IDs by name
AI1PressureAV1VelocityAV2FlowAV3PeakAV4ValleyAV5Velocity K-FactorAV6Flow AreaAV7Process Output LowAV8Process Output HighAV9Set Point 1 Trigger ValueAV10Set Point 1 Reset ValueAV11Set Point 2 Trigger ValueAV12Set Point 2 Reset ValueAV13Alarm High LimitAV14Alarm Low LimitMV1Process ModeMV2Voltage Output RangeMV3Relay 1 SourceMV4Relay 1 ActionMV5Relay 2 SourceMV6Relay 2 ActionMV7External Input TypeBV1Enable Set Point 1BV2Set Point 1 StatusBV3Enable Set Point 2BV4Set Point 2 StatusBV5Enable Alarm High LimitBV6Alarm High Limit StatusBV7Enable Alarm Low LimitBV8Alarm Low Limit StatusBV9Manual Alarm ResetBV10Power Up Alarm InhibitBV11Enable External InputBV12External Input StatusPIV1Alarm DelayPIV2External Input Activation DelayPIV3Damping Time
Integration notes
- Pressure, velocity and flow units are model specific; the BACnet units property is set separately from the display units.
- Peak, valley, set point, alarm and output limit values use the units of the process mode picked in MV 1.
- The overview table prints AV 12 as "Set Point 2 Reset"; its property table names it "Set Point 2 Reset Value" (used here).
- Alarm and input delays (PIV 1-2) have a maximum of 3600; the manual does not print their units.
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 DHC Digihelic differential pressure controller, 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 Dwyer Series DHC Digihelic differential pressure controller, BACnet MS/TP
How many BACnet points does the Dwyer Series DHC Digihelic differential pressure controller, BACnet MS/TP have?
This list has 37 BACnet objects: 1 analog input, 14 analog values, 12 binary values, 7 multi-state values, 3 positive integer values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Dwyer Series DHC Digihelic differential pressure controller, BACnet MS/TP BACnet points are writable?
29 of the 37 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 DHC Digihelic differential pressure controller, BACnet MS/TP BACnet documentation?
The source is Series DHC Digihelic Differential Pressure Controller - Specifications, Installation and Operating Instructions (Bulletin P-DHC (FR# 444618-00 Rev. 1)), revision 3/23, published free by Dwyer at https://assets.dwyeromega.com/manuals-do/AT_DHC_Instruction_Manual.pdf.
What are the minimum BACnet points to integrate the Dwyer Series DHC Digihelic differential pressure controller, BACnet MS/TP?
Start with AV 9 Set Point 1 Trigger Value (Set point 1 trigger value, process units); AI 1 Pressure (Differential pressure); AV 2 Flow (Airflow (flow mode)); BV 2 Set Point 1 Status (Set point 1 active); BV 4 Set Point 2 Status (Set point 2 active); BV 6 Alarm High Limit Status (High alarm active); BV 8 Alarm Low Limit Status (Low alarm active).
How do I check these points on the real Series DHC Digihelic differential pressure controller, 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 Dwyer BACnet points lists
- Airflow velocity sensor
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Dwyer Series AVLV low air velocity transmitters (100-400 FPM ranges) with the BACnet MS/TP option.
Also known as: AVLV, Series AVLV, AVLV BACnet, DwyerOmega AVLV, P-AVLV-B - Duct airflow velocity sensor
Dwyer Series AVPT pencil-style air velocity transmitter, BACnet MS/TP
Dwyer Series AVPT thermal-anemometer duct velocity transmitters ordered with the BACnet MS/TP output.
Also known as: AVPT, Series AVPT, AVPT BACnet, DwyerOmega AVPT, AVPT pencil style air velocity transmitter - 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 - CO / NO2 gas sensor
Dwyer Series GSTC carbon monoxide / nitrogen dioxide gas transmitter, BACnet MS/TP
Dwyer Series GSTC carbon monoxide (GSTC-C) and nitrogen dioxide (GSTC-N) gas transmitters with switch-selectable BACnet MS/TP or Modbus RTU.
Also known as: GSTC, GSTC-C, GSTC-N, Series GSTC, DwyerOmega GSTC, CO Detector, NO2 Detector - Insertion electromagnetic BTU / energy meter
Dwyer Series IEFB insertion thermal energy meter, BACnet MS/TP
Dwyer Series IEFB insertion electromagnetic flow meters with inlet/outlet RTDs that calculate thermal energy, on BACnet MS/TP or Modbus RTU.
Also known as: IEFB, Series IEFB, IEFB BTU meter, DwyerOmega IEFB, Series IEF energy meter, F-IEFB - Differential pressure and airflow sensor
Dwyer Series MS2 Magnesense II Differential Pressure Transmitter with BACnet (MS2-B)
Dwyer Series MS2 Magnesense II differential pressure transmitters with BACnet MS/TP (ranges up to 25 in. w.c.).
Also known as: MS2-B, MS2, Magnesense II, P-MS2-B - 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 - Humidity and temperature sensor
Dwyer Series RHPX humidity/temperature communicating transmitter, BACnet MS/TP
Dwyer Series RHPX duct, space and outdoor humidity/temperature transmitters with the BACnet MS/TP / Modbus RTU communication option.
Also known as: RHPX, Series RHPX, RHPX Comms, RHPX BACnet, DwyerOmega RHPX, AQ-RHPX-C - 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 DHC Digihelic Differential Pressure Controller - Specifications, Installation and Operating Instructions · Bulletin P-DHC (FR# 444618-00 Rev. 1) · rev. 3/23. Object names, instances and units are reproduced as published; descriptions are our own.