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Room controller (fan coil) · BACnet points list
ALRE KTRBUu217.456 BACnet room controller - application 2HRKR001 (2-pipe fan coil with supply air temperature limit) BACnet points list
Updated 4 November 2026
The KTRBUu217.456 is a flush-mounted 230 V room controller with display and BACnet MS/TP (B-AAC). Each built-in application loads its own object set; this entry is application 2HRKR001, fan coil, 2-pipe. The BMS sets the operation mode, heating/cooling mode and setpoints, writes window, presence and fire-alarm states, and must keep a heartbeat going to stay in online mode.
This page lists 37 BACnet objects for the ALRE KTRBUu217.456 BACnet room controller - application 2HRKR001 (2-pipe fan coil with supply air temperature limit) — 24 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from ALRE’s own free documentation, linked below.
- Manufacturer
- ALRE
- Model
- KTRBUu217.456 BACnet room controller - application 2HRKR001 (2-pipe fan coil with supply air temperature limit)
- Equipment
- Room controller (fan coil)
- Equipment type
- VAV boxes & fan coils
- BACnet objects
- 37 (24 writable)
- Transport
- BACnet MS/TP
- Firmware
- Not stated
- Default device instance
- 78
- Also known as
- KTRBUu217.456, KTRBUu-217.456, ALRE BACnet Raumregler, 2HRKR001
Reference only, provided as-is: verify against ALRE’s current documentation and the live device before use. Not official ALRE information. Terms of use.
BMS integration notes: ALRE KTRBUu217.456 BACnet room controller - application 2HRKR001 (2-pipe fan coil with supply air temperature limit)
Set device instance, MAC address (1-127), baud rate, Max Master and Max Info Frames on the controller. From the BMS, write Operation Mode BMS and (where present) Control-Mode BMS, the setpoints, and the window/presence states, and keep rewriting Heartbeat Input so the controller stays online.
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 2 | Operation Mode BMS | Protection, economy, pre-comfort or comfort | Write |
| MV 4 | Control-Mode BMS | Heating or cooling (change-over) | Write |
| AV 15 | Setpoint COMFORT Heating | Comfort heating setpoint | Write |
| AV 25 | Setpoint COMFORT Cooling | Comfort cooling setpoint | Write |
| BV 2 | Window State | Window open from the BMS, 1 = open | Write |
| AV 30 | Heartbeat Input | Rewrite seconds before it counts down to 0 | Write |
| MV 3 | Active Operation Mode | Operation mode in force | Read |
| AI 1 | Temperature | Room temperature | Read |
| AV 1 | Active Setpoint | Setpoint in use | Read |
Enable & remote start
Operation Mode BMS (MV 2) selects protection, economy, pre-comfort or comfort; the schedule object can also drive it. Fire Alarm (BV 6) puts the controller into its fire-alarm state.
Heartbeat & communication loss
Heartbeat Input (AV 30): the BMS writes a number of seconds and the controller counts it down once per second. At 0 the controller goes to offline mode (local operation only); the BMS must write a new value before it reaches 0.
Sensors & values from the BMS
Window State (BV 2) and Presence Detector (BV 3) are written by the BMS from its own window contacts and presence sensors; the controller reads window open from BV 2.
Network setup
- Device instance 0-4194302, MS/TP MAC 1-127, baud rate, Max Master and Max Info Frames are set in the controller's BACnet menu.
- Local Config PIN (AV 4) protects the local configuration menu; Maximum Local Offset (AV 5) limits the user's setpoint shift.
- Factory settings: device instance 78, baud 115200, MS/TP address 128, which keeps the port off until a 1-127 address is set.
Watch out for
- Without a regular heartbeat write the controller drops to offline mode.
- The controller rewrites many objects itself; command them at a higher priority or the change looks ignored.
ALRE KTRBUu217.456 BACnet room controller - application 2HRKR001 (2-pipe fan coil with supply air temperature limit) 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.
Note: the source document has no read/write column, so access here is inferred from the object type (inputs read-only, values writable). Confirm on the live controller before writing.
| Description | States | |||||
|---|---|---|---|---|---|---|
| AImin | 1 | Temperature | Room temperature used for control | °C | Read | |
| AI | 2 | Fan-Air Temperature | Fan discharge air temperature (external sensor) | °C | Read | |
| AO | 1 | Fan Control | Fan speed signal | % | Command | |
| AO | 11 | Control Value Heating | Heating valve signal | % | Command | |
| AO | 21 | Control Value Cooling | Cooling valve signal | % | Command | |
| AVmin | 1 | Active Setpoint | Setpoint currently in use | °C | Read | |
| AV | 2 | Air Temperature Max-Offset | Fan is reduced when room minus air temperature exceeds this | °C | Write | |
| AV | 4 | Local Config PIN | PIN for the local configuration menu | Write | ||
| AV | 5 | Maximum Local Offset | Maximum setpoint shift allowed at the unit | Write | ||
| AV | 12 | Setpoint PROTECTION Heating | Setpoint PROTECTION Heating | °C | Write | |
| AV | 13 | Setpoint ECONOMY Heating | Setpoint ECONOMY Heating | °C | Write | |
| AV | 14 | Setpoint PRE COMFORT Heating | Setpoint PRE COMFORT Heating | °C | Write | |
| AVmin | 15 | Setpoint COMFORT Heating | Setpoint COMFORT Heating | °C | Write | |
| AV | 22 | Setpoint PROTECTION Cooling | Setpoint PROTECTION Cooling | °C | Write | |
| AV | 23 | Setpoint ECONOMY Cooling | Setpoint ECONOMY Cooling | °C | Write | |
| AV | 24 | Setpoint PRE COMFORT Cooling | Setpoint PRE COMFORT Cooling | °C | Write | |
| AVmin | 25 | Setpoint COMFORT Cooling | Setpoint COMFORT Cooling | °C | Write | |
| AVmin | 30 | Heartbeat Input | BMS heartbeat: seconds until offline mode | Write | ||
| BO | 1 | Output Heating/Cooling | Heating/cooling relay output | Command | 0=off, 1=on | |
| BVmin | 2 | Window State | Window open/closed, written by the BMS | Write | 0=closed, 1=open | |
| BV | 3 | Presence Detector | Presence, written by the BMS | Write | 0=Person Absence, 1=Person Presence | |
| BV | 4 | User Reset | Reset the user's local settings | Write | 0=done, 1=Reset | |
| BV | 5 | User Control Lock | Lock all local controls | Write | 0=Usercontrol unlocked, 1=Usercontrol locked | |
| BV | 6 | Fire Alarm | Fire alarm from the BMS | Write | 0=Fire alarm not active, 1=Fire alarm active | |
| MVmin | 2 | Operation Mode BMS | Operation mode requested by the BMS | Write | 1=PROTECTION, 2=ECONOMY, 3=PRE COMFORT, 4=COMFORT | |
| MVmin | 3 | Active Operation Mode | Operation mode currently active | Read | 1=PROTECTION, 2=ECONOMY, 3=PRE COMFORT, 4=COMFORT, 5=EXTENDED PRESENCE, 6=VALVE PROTECTION, 7=BOOST MODE, 8=SLEEP MODE, 9=EMERGENCY-OPERATION, 10=FIRE ALARM | |
| MVmin | 4 | Control-Mode BMS | Heating/cooling mode requested by the BMS | Write | 1=Heating, 2=Cooling | |
| MV | 5 | Active Control-Mode | Heating/cooling mode currently active | Read | 1=Heating, 2=Cooling | |
| LO | 10 | Regulator Heating | Heating PID loop | Read | ||
| LO | 20 | Regulator Cooling | Cooling PID loop | Read | ||
| SCH | 1 | Operation-Mode-Schedule | Weekly schedule of operation modes | Write | ||
| NC | 10 | Notificationclass for Alarms | Notification class for alarms | Read | ||
| NC | 20 | Notificationclass for Faults | Notification class for faults | Read | ||
| NC | 30 | Notificationclass for Operational Messages | Notification class for operational messages | Read | ||
| FILE | 100 | checksum.sez | Configuration file | Read | ||
| FILE | 101 | customer.lua | Configuration file | Read | ||
| Other | 1 | PRG0000001_BOOT | Program object | Read |
No points match these filters.
Object ID lookup: ALRE KTRBUu217.456 2HRKR001 point IDs by name
AI1TemperatureAI2Fan-Air TemperatureAO1Fan ControlAO11Control Value HeatingAO21Control Value CoolingAV1Active SetpointAV2Air Temperature Max-OffsetAV4Local Config PINAV5Maximum Local OffsetAV12Setpoint PROTECTION HeatingAV13Setpoint ECONOMY HeatingAV14Setpoint PRE COMFORT HeatingAV15Setpoint COMFORT HeatingAV22Setpoint PROTECTION CoolingAV23Setpoint ECONOMY CoolingAV24Setpoint PRE COMFORT CoolingAV25Setpoint COMFORT CoolingAV30Heartbeat InputBO1Output Heating/CoolingBV2Window StateBV3Presence DetectorBV4User ResetBV5User Control LockBV6Fire AlarmMV2Operation Mode BMSMV3Active Operation ModeMV4Control-Mode BMSMV5Active Control-ModeLO10Regulator HeatingLO20Regulator CoolingSCH1Operation-Mode-ScheduleNC10Notificationclass for AlarmsNC20Notificationclass for FaultsNC30Notificationclass for Operational MessagesFILE100checksum.sezFILE101customer.lua
Integration notes
- Object list from ALRE's published EDE file for application 2HRKR001; the device object is left out. Application meanings from section 12.3 of the KTRBUu217.456 Handbuch (German).
- The EDE file has no access column; access here is inferred. The controller writes many of its own objects cyclically, so the BMS must write at a higher priority (Handbuch, troubleshooting).
- Multistate state numbers are taken from the order of the EDE state texts (1 = first text).
- Instance numbers follow a pattern: heating objects x1x, cooling objects x2x (setpoints AV 12-15 / 22-25, outputs AO 11 / 21, loops 10 / 20).
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 KTRBUu217.456 BACnet room controller - application 2HRKR001 (2-pipe fan coil with supply air temperature limit) 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 ALRE KTRBUu217.456 BACnet room controller - application 2HRKR001 (2-pipe fan coil with supply air temperature limit)
How many BACnet points does the ALRE KTRBUu217.456 BACnet room controller - application 2HRKR001 (2-pipe fan coil with supply air temperature limit) have?
This list has 37 BACnet objects: 2 analog inputs, 3 analog outputs, 13 analog values, 1 binary output, 5 binary values, 2 files, 2 loops, 3 notification classs, 1 schedule, 4 multi-state values, 1 other. The exact set on a given unit depends on its firmware, installed options and configuration.
Which ALRE KTRBUu217.456 BACnet room controller - application 2HRKR001 (2-pipe fan coil with supply air temperature limit) BACnet points are writable?
24 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. The source has no read/write column, so this is inferred from object type.
Where is the official ALRE KTRBUu217.456 BACnet room controller - application 2HRKR001 (2-pipe fan coil with supply air temperature limit) BACnet documentation?
The source is EDE data KTRBUu (file 2HRKR001-EDE.csv), revision EDE timestamp 2019-10-21, published free by ALRE at https://alre.de/wp-content/uploads/2026/11/EDE_Daten_KTRBUu.zip.
What are the minimum BACnet points to integrate the ALRE KTRBUu217.456 BACnet room controller - application 2HRKR001 (2-pipe fan coil with supply air temperature limit)?
Start with MV 2 Operation Mode BMS (Protection, economy, pre-comfort or comfort); MV 4 Control-Mode BMS (Heating or cooling (change-over)); AV 15 Setpoint COMFORT Heating (Comfort heating setpoint); AV 25 Setpoint COMFORT Cooling (Comfort cooling setpoint); BV 2 Window State (Window open from the BMS, 1 = open); AV 30 Heartbeat Input (Rewrite seconds before it counts down to 0); MV 3 Active Operation Mode (Operation mode in force); AI 1 Temperature (Room temperature); AV 1 Active Setpoint (Setpoint in use).
How do I enable BMS control of the ALRE KTRBUu217.456 BACnet room controller - application 2HRKR001 (2-pipe fan coil with supply air temperature limit)?
Operation Mode BMS (MV 2) selects protection, economy, pre-comfort or comfort; the schedule object can also drive it. Fire Alarm (BV 6) puts the controller into its fire-alarm state.
Does the ALRE KTRBUu217.456 BACnet room controller - application 2HRKR001 (2-pipe fan coil with supply air temperature limit) need a BACnet heartbeat or have a communication timeout?
Heartbeat Input (AV 30): the BMS writes a number of seconds and the controller counts it down once per second. At 0 the controller goes to offline mode (local operation only); the BMS must write a new value before it reaches 0.
Can the BMS supply sensor values to the ALRE KTRBUu217.456 BACnet room controller - application 2HRKR001 (2-pipe fan coil with supply air temperature limit)?
Window State (BV 2) and Presence Detector (BV 3) are written by the BMS from its own window contacts and presence sensors; the controller reads window open from BV 2.
How do I check these points on the real KTRBUu217.456 BACnet room controller - application 2HRKR001 (2-pipe fan coil with supply air temperature limit)?
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 ALRE BACnet points lists
- Room controller (underfloor heating)
ALRE KTRBUu217.456 BACnet room controller - application 2FB001 / 2FB002 (2-pipe underfloor heating (minimum or maximum floor temperature))
ALRE KTRBUu217.456 flush-mounted BACnet MS/TP room controller set to application 2FB001 / 2FB002: 2-pipe underfloor heating (minimum or maximum floor temperature).
Also known as: KTRBUu217.456, KTRBUu-217.456, ALRE BACnet Raumregler, 2FB001, 2FB002 - Room controller (chilled ceiling)
ALRE KTRBUu217.456 BACnet room controller - application 2KD001 (2-pipe heating/cooling ceiling with dew point monitor)
ALRE KTRBUu217.456 flush-mounted BACnet MS/TP room controller set to application 2KD001: 2-pipe heating/cooling ceiling with dew point monitor.
Also known as: KTRBUu217.456, KTRBUu-217.456, ALRE BACnet Raumregler, 2KD001 - Room controller (radiator)
ALRE KTRBUu217.456 BACnet room controller - application 2RA001 (2-pipe radiator)
ALRE KTRBUu217.456 flush-mounted BACnet MS/TP room controller set to application 2RA001: 2-pipe radiator.
Also known as: KTRBUu217.456, KTRBUu-217.456, ALRE BACnet Raumregler, 2RA001 - Room controller (fan coil)
ALRE KTRBUu217.456 BACnet room controller - application 2UK001 (2-pipe fan convector / trench convector)
ALRE KTRBUu217.456 flush-mounted BACnet MS/TP room controller set to application 2UK001: 2-pipe fan convector / trench convector.
Also known as: KTRBUu217.456, KTRBUu-217.456, ALRE BACnet Raumregler, 2UK001 - Room controller (underfloor heating)
ALRE KTRBUu217.456 BACnet room controller - application 4FB001 (4-pipe underfloor heating/cooling)
ALRE KTRBUu217.456 flush-mounted BACnet MS/TP room controller set to application 4FB001: 4-pipe underfloor heating/cooling.
Also known as: KTRBUu217.456, KTRBUu-217.456, ALRE BACnet Raumregler, 4FB001 - Room controller (fan coil)
ALRE KTRBUu217.456 BACnet room controller - application 4HRKR001 / 4RAKR001 (4-pipe fan coil (alone or with radiator))
ALRE KTRBUu217.456 flush-mounted BACnet MS/TP room controller set to application 4HRKR001 / 4RAKR001: 4-pipe fan coil (alone or with radiator).
Also known as: KTRBUu217.456, KTRBUu-217.456, ALRE BACnet Raumregler, 4HRKR001, 4RAKR001 - Room controller (chilled ceiling)
ALRE KTRBUu217.456 BACnet room controller - application 4KD001 (4-pipe heating/cooling ceiling with 6-way ball valve)
ALRE KTRBUu217.456 flush-mounted BACnet MS/TP room controller set to application 4KD001: 4-pipe heating/cooling ceiling with 6-way ball valve.
Also known as: KTRBUu217.456, KTRBUu-217.456, ALRE BACnet Raumregler, 4KD001 - Room controller (chilled ceiling)
ALRE KTRBUu217.456 BACnet room controller - application 4KD002 / 4UK001 (4-pipe heating/cooling ceiling with air-quality damper output, or 4-pipe fan/trench convector)
ALRE KTRBUu217.456 flush-mounted BACnet MS/TP room controller set to application 4KD002 / 4UK001: 4-pipe heating/cooling ceiling with air-quality damper output, or 4-pipe fan/trench convector.
Also known as: KTRBUu217.456, KTRBUu-217.456, ALRE BACnet Raumregler, 4KD002, 4UK001 - Room controller (chilled ceiling)
ALRE KTRBUu217.456 BACnet room controller - application 4KD003 / 4RAKD001 (4-pipe heating/cooling ceiling (alone or with radiator))
ALRE KTRBUu217.456 flush-mounted BACnet MS/TP room controller set to application 4KD003 / 4RAKD001: 4-pipe heating/cooling ceiling (alone or with radiator).
Also known as: KTRBUu217.456, KTRBUu-217.456, ALRE BACnet Raumregler, 4KD003, 4RAKD001
Source: EDE data KTRBUu (file 2HRKR001-EDE.csv) · rev. EDE timestamp 2019-10-21. Object names, instances and units are reproduced as published; descriptions are our own.