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Toshiba BN interface BMS-IFBN1281U BACnet points list
Updated 28 October 2026
The BN interface is a Toshiba Carrier gateway that converts the TU2C-LINK / TCC-LINK central control line to BACnet/IP, serving up to 128 indoor units (64 on TCC-LINK). Every indoor unit gets the same block of objects, with the instance built from the unit's central control address and a fixed per-function code. Objects only exist for units found during the gateway's air conditioner search mode.
This page lists 68 BACnet objects for the Toshiba BN interface BMS-IFBN1281U — 26 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Toshiba’s own free documentation, linked below.
- Manufacturer
- Toshiba
- Model
- BN interface BMS-IFBN1281U
- Equipment
- VRF BACnet gateway
- Equipment type
- VRF & split air conditioners
- BACnet objects
- 68 (26 writable)
- Transport
- BACnet IP
- Firmware
- Not stated
- Default device instance
- 100
- Also known as
- BMS-IFBN1281U-E, BMS-IFBN1281U-TR, Toshiba BACnet interface, Toshiba Carrier BN interface, TU2C-LINK BACnet
BMS integration notes: Toshiba BN interface BMS-IFBN1281U
Give every indoor unit a central control address, run the BN interface's air conditioner search mode, then map each unit's block of objects (instance = address x 256 + code). Command through the output objects (start/stop, mode, fan, setpoint) and read the matching input objects back for status. Watch Alarm/BI, Alarm_Code/MI and Indoor_Communication_Failure for faults.
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 |
|---|---|---|---|
| BO 386 | State/BO_*** | Start/stop the indoor unit | Command |
| MO 387 | Mode/MO_*** | Sets heat/cool/fan/dry/auto | Command |
| AO 388 | Temp/AO_*** | Writes the setpoint | Command |
| MO 389 | Fan/MO_*** | Sets fan speed | Command |
| BI 258 | State/BI_*** | Confirms the unit's on/off state | Read |
| AI 264 | Room_Temp/AI_*** | Room temperature at the unit | Read |
| BI 320 | Alarm/BI_*** | Unit alarm flag | Read |
| MI 257 | Alarm_Code/MI_*** | Check code: 1 = no alarm, other values encode the fault | Read |
| BI 321 | Indoor_Communication_Failure_*** | Lost communication with the indoor unit | Read |
Enable & remote start
No enable point is described; units can be commanded once they have a central control address and were found by air conditioner search mode. Inhibit/MO can prohibit local remote-controller changes to start/stop, mode and setpoint.
Network setup
- Factory default IP 192.168.1.100, subnet 255.255.255.0, BACnet/IP on UDP 47808.
- Default device instance = last byte of the IP address (100), so changing the IP changes the device instance unless 'User Setting' is chosen in the engineering tool.
- IP, device instance and other settings are changed with Toshiba Carrier's Setting File Creation Software2 and uploaded as a DEF file (over the network or by USB flash drive).
- Central control addresses must be set on every indoor unit; holding the Shutdown button for 4 s or more starts air conditioner search mode to build the unit list.
- When multiple BN interfaces are used, each needs its own IP address and device instance.
Watch out for
- Re-run air conditioner search mode after any change to central control, line or unit addresses, or after replacing the microSD card.
- Auto cool/heat setpoints are only sent when cool setpoint >= heat setpoint, should be changed while the unit is in Auto, need 10 s between changes, and must not be written together in one WritePropertyMultiple.
- Fan speed and louver objects cannot be used on units whose fan speed or louver options are fixed; in Dry mode fan speed is auto only.
- Setpoint limits depend on the indoor unit type (18-29 °C standard FCU, 16-27 °C fresh-air intake unit).
- Duplicate central control addresses stop the search from completing correctly; check the search results file (SearchObjectLog.tsv).
Toshiba BN interface BMS-IFBN1281U 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 | |||||
|---|---|---|---|---|---|---|
| DEV | 100 | AC_CONTROLER | BN interface device object (default instance = IP last byte) | Read | ||
| BImin | 258 | State/BI_*** | Indoor unit on/off status | Read | INACTIVE=Stop, ACTIVE=Start | |
| BOmin | 386 | State/BO_*** | Indoor unit start/stop command | Command | INACTIVE=Stop, ACTIVE=Start | |
| MI | 259 | Mode/MI_*** | Operation mode status | Read | Heat / Cool / Fan / Dry / Auto | |
| MOmin | 387 | Mode/MO_*** | Operation mode command | Command | Heat / Cool / Fan / Dry / Auto | |
| MI | 261 | Fan/MI_*** | Fan speed status | Read | Auto / HH / H / L / LL / H+ / L+ | |
| MOmin | 389 | Fan/MO_*** | Fan speed command | Command | Auto / HH / H / L / LL / H+ / L+ | |
| AI | 260 | Temp/AI_*** | Setpoint status | °C/°F | Read | |
| AOmin | 388 | Temp/AO_*** | Setpoint command | °C/°F | Command | |
| AI | 366 | AutoCoolSetpoint/AI_*** | Auto-mode cooling setpoint status | °C/°F | Read | |
| AO | 494 | AutoCoolSetpoint/AO_*** | Auto-mode cooling setpoint command | °C/°F | Command | |
| AI | 367 | AutoHeatSetpoint/AI_*** | Auto-mode heating setpoint status | °C/°F | Read | |
| AO | 495 | AutoHeatSetpoint/AO_*** | Auto-mode heating setpoint command | °C/°F | Command | |
| AImin | 264 | Room_Temp/AI_*** | Room temperature (-39 to 150 °C range) | °C/°F | Read | |
| MI | 265 | Inhibit/MI_*** | Local remote permit/prohibit status | Read | Permit/prohibit of start/stop, operation mode, temperature setting | |
| MO | 393 | Inhibit/MO_*** | Local remote permit/prohibit command | Command | Permit/prohibit of start/stop, operation mode, temperature setting | |
| BI | 276 | Filter/BI_*** | Filter sign | Read | Normal / Filter Sign | |
| BO | 405 | Filter/BO_*** | Filter sign reset | Command | - / Filter Sign Reset | |
| BImin | 320 | Alarm/BI_*** | Alarm status | Read | No Alarm / Alarm | |
| MImin | 257 | Alarm_Code/MI_*** | Check code | Read | No Check Code / Check Code | |
| MI | 263 | Flap/MI_*** | Louver position status | Read | Swing / F1 / F2 / F3 / F4 / F5 / Stop | |
| MO | 391 | Flap/MO_*** | Louver position command | Command | Swing / F1 / F2 / F3 / F4 / F5 / Stop | |
| BI | 296 | VentilationState/BI_*** | Ventilation on/off status (option) | Read | INACTIVE=Stop, ACTIVE=Start | |
| BO | 424 | VentilationState/BO_*** | Ventilation start/stop (option) | Command | INACTIVE=Stop, ACTIVE=Start | |
| MI | 297 | VentilationMode/MI_*** | Ventilation mode status (option) | Read | Bypass Mode / Heat Exchange Mode / Automatic Mode / 24-hours / Nighttime Heat purge | |
| MO | 425 | VentilationMode/MO_*** | Ventilation mode command (option) | Command | Bypass Mode / Heat Exchange Mode / Automatic Mode | |
| MI | 332 | VentilationFan/MI_*** | Ventilation fan speed status (option) | Read | H / M / Unbalanced | |
| MO | 460 | VentilationFan/MO_*** | Ventilation fan speed command (option) | Command | H / M / Unbalanced | |
| BI | 340 | IndoorThermoState/BI_*** | Indoor unit thermo on/off status | Read | Thermo ON / Thermo OFF | |
| MI | 341 | IndoorSaveState/MI_*** | Save operation rate status (option) | Read | No Save (100%) / XX% Save (100-50%) / 50% Save / 100% Save (forced thermo off) | |
| MO | 469 | IndoorSaveState/MO_*** | Save operation rate command (option) | Command | No Save (100%) / XX% Save (100-50%) / 50% Save / 100% Save (forced thermo off) | |
| BImin | 321 | Indoor_Communication_Failure_*** | Indoor unit communication failure | Read | Normal / Alarm | |
| MI | 266 | Facility_request /MI_*** | Facility request level | Read | 1 (Thermo off) to 16 | |
| MI | 355 | Notice_Code1/MI_*** | Notice code 1 (TU2C-LINK models) | Read | No Notice Code / Notice Code | |
| MI | 356 | Notice_Code1/MI_*** | Notice code 2 (TU2C-LINK models) | Read | No Notice Code / Notice Code | |
| MI | 357 | Notice_Code1/MI_*** | Notice code 3 (TU2C-LINK models) | Read | No Notice Code / Notice Code | |
| MI | 358 | Notice_Code1/MI_*** | Notice code 4 (TU2C-LINK models) | Read | No Notice Code / Notice Code | |
| MI | 359 | Notice_Code1/MI_*** | Notice code 5 (TU2C-LINK models) | Read | No Notice Code / Notice Code | |
| BI | 342 | AtwZone_State/BI_*** | ATW Zone1/2 on/off status | Read | INACTIVE=Stop, ACTIVE=Start | |
| BO | 470 | AtwZone_State/BO_*** | ATW Zone1/2 start/stop | Command | INACTIVE=Stop, ACTIVE=Start | |
| BI | 343 | AtwHWS_State/BI_*** | ATW hot water on/off status | Read | INACTIVE=Stop, ACTIVE=Start | |
| BO | 471 | AtwHWS_State/BO_*** | ATW hot water start/stop | Command | INACTIVE=Stop, ACTIVE=Start | |
| BI | 350 | AtwAutoTemp/BI_*** | ATW auto temp setting status | Read | INACTIVE=OFF, ACTIVE=ON | |
| BO | 478 | AtwAutoTemp/BO_*** | ATW auto temp setting on/off | Command | INACTIVE=OFF, ACTIVE=ON | |
| BI | 351 | AtwNightSetback/BI_*** | ATW night setback status | Read | INACTIVE=OFF, ACTIVE=ON | |
| BO | 479 | AtwNightSetback/BO_*** | ATW night setback on/off | Command | INACTIVE=OFF, ACTIVE=ON | |
| BI | 353 | AtwFrostProtection/BI_*** | ATW frost protection status | Read | INACTIVE=OFF, ACTIVE=ON | |
| BO | 481 | AtwFrostProtection/BO_*** | ATW frost protection on/off | Command | INACTIVE=OFF, ACTIVE=ON | |
| BI | 354 | AtwAntiBacteria/BI_*** | ATW anti-bacteria status | Read | INACTIVE=OFF, ACTIVE=ON | |
| BO | 482 | AtwAntiBacteria/BO_*** | ATW anti-bacteria on/off | Command | INACTIVE=OFF, ACTIVE=ON | |
| AI | 344 | AtwZone1_Setpoint/AI_*** | ATW Zone1 setpoint status | °C/°F | Read | |
| AO | 472 | AtwZone1_Setpoint/AO_*** | ATW Zone1 setpoint command | °C/°F | Command | |
| AI | 345 | AtwZone2_Setpoint/AI_*** | ATW Zone2 setpoint status | °C/°F | Read | |
| AO | 473 | AtwZone2_Setpoint/AO_*** | ATW Zone2 setpoint command | °C/°F | Command | |
| AI | 346 | AtwHWS_Setpoint/AI_*** | ATW hot water setpoint status | °C/°F | Read | |
| AO | 474 | AtwHWS_Setpoint/AO_*** | ATW hot water setpoint command | °C/°F | Command | |
| AI | 347 | AtwZone1_CtrlTemp/AI_*** | ATW Zone1 control temperature | °C/°F | Read | |
| AI | 348 | AtwZone2_CtrlTemp/AI_*** | ATW Zone2 control temperature | °C/°F | Read | |
| AI | 349 | AtwHWS_CtrlTemp/AI_*** | ATW hot water control temperature | °C/°F | Read | |
| BI | 361 | RacPureFilter/BI_*** | RAC pure filter status | Read | INACTIVE=OFF, ACTIVE=ON | |
| BI | 362 | RacHiPower/BI_*** | RAC Hi-Power status | Read | INACTIVE=OFF, ACTIVE=ON | |
| BO | 490 | RacHiPower/BO_*** | RAC Hi-Power on/off | Command | INACTIVE=OFF, ACTIVE=ON | |
| BI | 363 | RacEco/BI_*** | RAC ECO status | Read | INACTIVE=OFF, ACTIVE=ON | |
| BO | 491 | RacEco/BO_*** | RAC ECO on/off | Command | INACTIVE=OFF, ACTIVE=ON | |
| BI | 364 | RacQuietFcu/BI_*** | RAC quiet indoor fan status | Read | INACTIVE=OFF, ACTIVE=ON | |
| BO | 492 | RacQuietFcu/BO_*** | RAC quiet indoor fan on/off | Command | INACTIVE=OFF, ACTIVE=ON | |
| BI | 365 | RacSilenceCdu/BI_*** | RAC silent outdoor unit status | Read | INACTIVE=OFF, ACTIVE=ON | |
| BO | 493 | RacSilenceCdu/BO_*** | RAC silent outdoor unit on/off | Command | INACTIVE=OFF, ACTIVE=ON |
No points match these filters.
Integration notes
- Instance formula: equipment number n (central control address, 1-128) x 256 + function code (e.g. ON/OFF status code 0x02 gives n*256+2). This file lists unit n=1.
- In object names, *** stands for the air-conditioner number 1-128.
- The manual prints the name Notice_Code1/MI_*** for all five notice-code objects; their object IDs differ (codes 0x63-0x67).
- ATW (air-to-water), RAC interface and ventilation objects only apply when that equipment is connected; ATW and RAC interfaces cannot be connected at the same time.
- Analog values follow the gateway's Celsius/Fahrenheit setting (BMS-IFBN1281U-E/-TR default Celsius).
- Output objects expose a Priority_Array; Out_Of_Service is writable on the I/O objects.
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. Easy BACnet scans a network for BACnet IP devices from an Android phone, reads every object on the BN interface BMS-IFBN1281U 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 Toshiba BN interface BMS-IFBN1281U
How many BACnet points does the Toshiba BN interface BMS-IFBN1281U have?
This list has 68 BACnet objects: 10 analog inputs, 6 analog outputs, 17 binary inputs, 13 binary outputs, 1 device, 14 multi-state inputs, 7 multi-state outputs. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Toshiba BN interface BMS-IFBN1281U BACnet points are writable?
26 of the 68 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 Toshiba BN interface BMS-IFBN1281U BACnet documentation?
The source is BN interface Service Manual, BMS-IFBN1281U-E / BMS-IFBN1281U-TR (A10-2301-3), revision 2024-05 (Revision 3), published free by Toshiba at https://www.toshiba-airconditioning.eu/@@download-proxy?uid=bfc26091451b41b1814e41f0d95432ab.
What are the minimum BACnet points to integrate the Toshiba BN interface BMS-IFBN1281U?
Start with BO 386 State/BO_*** (Start/stop the indoor unit); MO 387 Mode/MO_*** (Sets heat/cool/fan/dry/auto); AO 388 Temp/AO_*** (Writes the setpoint); MO 389 Fan/MO_*** (Sets fan speed); BI 258 State/BI_*** (Confirms the unit's on/off state); AI 264 Room_Temp/AI_*** (Room temperature at the unit); BI 320 Alarm/BI_*** (Unit alarm flag); MI 257 Alarm_Code/MI_*** (Check code: 1 = no alarm, other values encode the fault); BI 321 Indoor_Communication_Failure_*** (Lost communication with the indoor unit).
How do I enable BMS control of the Toshiba BN interface BMS-IFBN1281U?
No enable point is described; units can be commanded once they have a central control address and were found by air conditioner search mode. Inhibit/MO can prohibit local remote-controller changes to start/stop, mode and setpoint.
How do I check these points on the real BN interface BMS-IFBN1281U?
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.
Source: BN interface Service Manual, BMS-IFBN1281U-E / BMS-IFBN1281U-TR · A10-2301-3 · rev. 2024-05 (Revision 3). Object names, instances and units are reproduced as published; descriptions are our own.