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Fire and smoke damper control module · BACnet points list
TROX TROXNETCOM MB-BAC-WA1/4 fire damper module (BACnet MS/TP) BACnet points list
Updated 6 November 2026
The MB-BAC-WA1/4 module connects up to 4 fire or smoke dampers to BACnet MS/TP (or Modbus RTU). Per channel it has an operating-mode object, a safe position, an open/close command, position feedback, an alarm object and run-time and heartbeat timers; a test object starts a damper test for all channels. 38 objects in total; the object names are factory defaults and can be renamed.
This page lists 38 BACnet objects for the TROX TROXNETCOM MB-BAC-WA1/4 fire damper module (BACnet MS/TP) — 29 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from TROX’s own free documentation, linked below.
- Manufacturer
- TROX
- Model
- TROXNETCOM MB-BAC-WA1/4 fire damper module (BACnet MS/TP)
- Equipment
- Fire and smoke damper control module
- Equipment type
- Other equipment
- BACnet objects
- 38 (29 writable)
- Transport
- BACnet MS/TP
- Firmware
- 1.0
- Default device instance
- 32900 + address switch
- Also known as
- MB-BAC-WA1/4, TROXNETCOM, MB-BAC-WA1-4
Reference only, provided as-is: verify against TROX’s current documentation and the live device before use. Not official TROX information. Terms of use.
BMS integration notes: TROX TROXNETCOM MB-BAC-WA1/4 fire damper module (BACnet MS/TP)
Set each channel mode in Damper1..4 (MV 1-4) and its safe position, then drive motorised dampers with ActuDrive (open/close) and read ActuPos and Alarm. Write OK (1) to an Alarm object to reset it. If RcvHrtBt is set, the BMS must rewrite ActuDrive within that time.
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 |
|---|---|---|---|
| MV 9 | ActuDrive1 | Open/close command, damper 1 | Write |
| BV 1 | Test | Starts a damper test run | Write |
| MV 13 | ActuPos1 | Damper 1 position: open, close, running | Read |
| BV 2 | FireChain | Fire chain relay state | Read |
| MV 21 | Alarm1 | Channel 1 alarm; write 1 (OK) to reset | Write |
Enable & remote start
A channel is only active once its Damper object (MV 1-4) is set from Inactive (1, factory) to an operating mode.
Heartbeat & communication loss
RcvHrtBt1..4 (AV 9-12, factory 0 = off) sets the maximum time between writes to ActuDrive. If it is exceeded the channel reports Update_Error and the damper goes to its safe position; the error stays latched until reset.
Network setup
- Default device instance 32900 + the address on hex switches X/Y.
- Baud rate 9600, 19200, 38400 or 76800 on DIP switches 2 and 3.
- Max_Master default 127, Max_Info_Frames default 1.
Watch out for
- Only the first error per channel is reported; reset it (write OK) before another can show.
- Runtime_Error and Update_Error send the damper to SafetyPos; Manipulation switches the relay off.
- Configuration objects (marked RW-E) are stored in EEPROM, so set them at commissioning rather than writing them repeatedly.
TROX TROXNETCOM MB-BAC-WA1/4 fire damper module (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 | |||||
|---|---|---|---|---|---|---|
| BVmin | 1 | Test | Starts, stops and signals a damper test run | Write | 0=No_Test_Active, 1=Test_Active | |
| BVmin | 2 | FireChain | Fire chain relay state | Read | 0=Relay_Off, 1=Relay_On | |
| AV | 1 | DriveTime1 | Max. opening time of damper 1, 0 = off (default 240) | s | Write | |
| AV | 2 | DriveTime2 | Max. opening time of damper 2, 0 = off (default 240) | s | Write | |
| AV | 3 | DriveTime3 | Max. opening time of damper 3, 0 = off (default 240) | s | Write | |
| AV | 4 | DriveTime4 | Max. opening time of damper 4, 0 = off (default 240) | s | Write | |
| AV | 5 | TurnOffTime1 | Max. closing time of damper 1, 0 = off (default 35) | s | Write | |
| AV | 6 | TurnOffTime2 | Max. closing time of damper 2, 0 = off (default 35) | s | Write | |
| AV | 7 | TurnOffTime3 | Max. closing time of damper 3, 0 = off (default 35) | s | Write | |
| AV | 8 | TurnOffTime4 | Max. closing time of damper 4, 0 = off (default 35) | s | Write | |
| AV | 9 | RcvHrtBt1 | Max. time between ActuDrive1 writes, 0 = off | s | Write | |
| AV | 10 | RcvHrtBt2 | Max. time between ActuDrive2 writes, 0 = off | s | Write | |
| AV | 11 | RcvHrtBt3 | Max. time between ActuDrive3 writes, 0 = off | s | Write | |
| AV | 12 | RcvHrtBt4 | Max. time between ActuDrive4 writes, 0 = off | s | Write | |
| MV | 1 | Damper1 | Operating mode of channel 1 | Write | 1=Inactive, 2=Motorized_Damper, 3=Limit_Switches_Open_and_Closed, 4=Only_Limit_Switch_Open, 5=Only_Limit_Switch_Closed | |
| MV | 2 | Damper2 | Operating mode of channel 2 | Write | 1=Inactive, 2=Motorized_Damper, 3=Limit_Switches_Open_and_Closed, 4=Only_Limit_Switch_Open, 5=Only_Limit_Switch_Closed | |
| MV | 3 | Damper3 | Operating mode of channel 3 | Write | 1=Inactive, 2=Motorized_Damper, 3=Limit_Switches_Open_and_Closed, 4=Only_Limit_Switch_Open, 5=Only_Limit_Switch_Closed | |
| MV | 4 | Damper4 | Operating mode of channel 4 | Write | 1=Inactive, 2=Motorized_Damper, 3=Limit_Switches_Open_and_Closed, 4=Only_Limit_Switch_Open, 5=Only_Limit_Switch_Closed | |
| MV | 5 | SafetyPos1 | Safe position of damper 1 on error | Write | 1=open, 2=close | |
| MV | 6 | SafetyPos2 | Safe position of damper 2 on error | Write | 1=open, 2=close | |
| MV | 7 | SafetyPos3 | Safe position of damper 3 on error | Write | 1=open, 2=close | |
| MV | 8 | SafetyPos4 | Safe position of damper 4 on error | Write | 1=open, 2=close | |
| MVmin | 9 | ActuDrive1 | Open/close command for damper 1 | Write | 1=open, 2=close | |
| MV | 10 | ActuDrive2 | Open/close command for damper 2 | Write | 1=open, 2=close | |
| MV | 11 | ActuDrive3 | Open/close command for damper 3 | Write | 1=open, 2=close | |
| MV | 12 | ActuDrive4 | Open/close command for damper 4 | Write | 1=open, 2=close | |
| MVmin | 13 | ActuPos1 | Position of damper 1 from limit switches | Read | 1=open, 2=close, 3=running | |
| MV | 14 | ActuPos2 | Position of damper 2 from limit switches | Read | 1=open, 2=close, 3=running | |
| MV | 15 | ActuPos3 | Position of damper 3 from limit switches | Read | 1=open, 2=close, 3=running | |
| MV | 16 | ActuPos4 | Position of damper 4 from limit switches | Read | 1=open, 2=close, 3=running | |
| MV | 17 | ActuPos1a | Position of second damper on channel 1 | Read | 1=open, 2=close | |
| MV | 18 | ActuPos2a | Position of second damper on channel 2 | Read | 1=open, 2=close | |
| MV | 19 | ActuPos3a | Position of second damper on channel 3 | Read | 1=open, 2=close | |
| MV | 20 | ActuPos4a | Position of second damper on channel 4 | Read | 1=open, 2=close | |
| MVmin | 21 | Alarm1 | Alarm state of channel 1; write OK (1) to reset | Write | 1=OK, 2=System_Error, 3=Runtime_Error, 4=Manipulation, 5=Update_Error, 6=Alarm, 7=Alarm_a | |
| MV | 22 | Alarm2 | Alarm state of channel 2; write OK (1) to reset | Write | 1=OK, 2=System_Error, 3=Runtime_Error, 4=Manipulation, 5=Update_Error, 6=Alarm, 7=Alarm_a | |
| MV | 23 | Alarm3 | Alarm state of channel 3; write OK (1) to reset | Write | 1=OK, 2=System_Error, 3=Runtime_Error, 4=Manipulation, 5=Update_Error, 6=Alarm, 7=Alarm_a | |
| MV | 24 | Alarm4 | Alarm state of channel 4; write OK (1) to reset | Write | 1=OK, 2=System_Error, 3=Runtime_Error, 4=Manipulation, 5=Update_Error, 6=Alarm, 7=Alarm_a |
No points match these filters.
Object ID lookup: TROX TROXNETCOM MB-BAC-WA1/4 fire damper module point IDs by name
BV1TestBV2FireChainAV1DriveTime1AV2DriveTime2AV3DriveTime3AV4DriveTime4AV5TurnOffTime1AV6TurnOffTime2AV7TurnOffTime3AV8TurnOffTime4AV9RcvHrtBt1AV10RcvHrtBt2AV11RcvHrtBt3AV12RcvHrtBt4MV1Damper1MV2Damper2MV3Damper3MV4Damper4MV5SafetyPos1MV6SafetyPos2MV7SafetyPos3MV8SafetyPos4MV9ActuDrive1MV10ActuDrive2MV11ActuDrive3MV12ActuDrive4MV13ActuPos1MV14ActuPos2MV15ActuPos3MV16ActuPos4MV17ActuPos1aMV18ActuPos2aMV19ActuPos3aMV20ActuPos4aMV21Alarm1MV22Alarm2MV23Alarm3MV24Alarm4
Integration notes
- AV 1-12 and MV 5-24 are disabled by default; they appear once Damper1..4 (MV 1-4) sets a channel operating mode.
- Most objects only exist in Motorised_Damper mode; ActuPos..a is only used with the two "Only_Limit_Switch" modes (two mechanical dampers per channel).
- Object names, descriptions and state texts are writable and stored in EEPROM; the names here are the factory defaults.
- COV is supported for ActuPos, ActuPos..a and Alarm objects (max. 10 subscriptions).
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 TROXNETCOM MB-BAC-WA1/4 fire damper module (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 TROX TROXNETCOM MB-BAC-WA1/4 fire damper module (BACnet MS/TP)
How many BACnet points does the TROX TROXNETCOM MB-BAC-WA1/4 fire damper module (BACnet MS/TP) have?
This list has 38 BACnet objects: 12 analog values, 2 binary values, 24 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which TROX TROXNETCOM MB-BAC-WA1/4 fire damper module (BACnet MS/TP) BACnet points are writable?
29 of the 38 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 TROX TROXNETCOM MB-BAC-WA1/4 fire damper module (BACnet MS/TP) BACnet documentation?
The source is TROXNETCOM functional module MB-BAC-WA1/4 - Installation, commissioning and maintenance manual (A00000068978 V2), revision 2026-04, published free by TROX at https://www.trox.de/en/downloads/345d50c92eb87aec/MB-BAC-WA1-4_ICM_A00000068978_V2_2026_04_GB_en.pdf.
What are the minimum BACnet points to integrate the TROX TROXNETCOM MB-BAC-WA1/4 fire damper module (BACnet MS/TP)?
Start with MV 9 ActuDrive1 (Open/close command, damper 1); BV 1 Test (Starts a damper test run); MV 13 ActuPos1 (Damper 1 position: open, close, running); BV 2 FireChain (Fire chain relay state); MV 21 Alarm1 (Channel 1 alarm; write 1 (OK) to reset).
How do I enable BMS control of the TROX TROXNETCOM MB-BAC-WA1/4 fire damper module (BACnet MS/TP)?
A channel is only active once its Damper object (MV 1-4) is set from Inactive (1, factory) to an operating mode.
Does the TROX TROXNETCOM MB-BAC-WA1/4 fire damper module (BACnet MS/TP) need a BACnet heartbeat or have a communication timeout?
RcvHrtBt1..4 (AV 9-12, factory 0 = off) sets the maximum time between writes to ActuDrive. If it is exceeded the channel reports Update_Error and the damper goes to its safe position; the error stays latched until reset.
How do I check these points on the real TROXNETCOM MB-BAC-WA1/4 fire damper module (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.
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TROX UNIVERSAL room airflow controller (EM-IP, BACnet IP)
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TROX UNIVERSAL room airflow controller, master (EM-IP, BACnet IP)
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TROX UNIVERSAL room or duct pressure controller, master (EM-BAC-MOD-01, BACnet MS/TP)
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TROX UNIVERSAL room or duct pressure controller, master (EM-IP, BACnet IP)
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TROX UNIVERSAL room pressure controller (EM-IP, BACnet IP)
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Source: TROXNETCOM functional module MB-BAC-WA1/4 - Installation, commissioning and maintenance manual · A00000068978 V2 · rev. 2026-04. Object names, instances and units are reproduced as published; descriptions are our own.