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VRV BACnet gateway · BACnet points list
Daikin DMS502B71 Interface for use in BACnet BACnet points list
Updated 28 October 2026
The DMS502B71 BACnet Interface (with the optional DAM411B51 expansion for DIII-Net ports 3 and 4) is a BACnet IP server that maps every VRV indoor unit group to the same 35-member object template. Integrators read on/off, mode, fan speed, room temperature, alarm and malfunction code, and can write start/stop, mode, setpoint, fan speed, airflow direction and remote-controller permit/prohibit per group. Object names end in the three-digit indoor unit number and instance numbers are built from that unit number.
This page lists 34 BACnet objects for the Daikin DMS502B71 Interface for use in BACnet — 15 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Daikin’s own free documentation, linked below.
- Manufacturer
- Daikin
- Model
- DMS502B71 Interface for use in BACnet
- Equipment
- VRV BACnet gateway
- Equipment type
- VRF & split air conditioners
- BACnet objects
- 34 (15 writable)
- Transport
- BACnet IP
- Firmware
- Ver. 6.20 or later
- Also known as
- DMS502B71, DAM411B51, D-BACS, Daikin VRV BACnet interface, BACnet Interface, EDUS72-749
BMS integration notes: Daikin DMS502B71 Interface for use in BACnet
Commission the interface with the Daikin test-operation/setup tool, then address each indoor unit group by its object suffix (000-255). Typical integration writes start/stop, mode, setpoint and fan speed per group and reads on/off status, room temperature, alarm and malfunction code.
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 1 | StartStopCommand_XXX | Start/stop the indoor unit group | Command |
| MO 5 | AirConModeCommand_XXX | Operation mode command | Command |
| AV 10 | TempAdjust_XXX | Setpoint | Write |
| MO 7 | AirFlowRateCommand_XXX | Fan speed command | Command |
| BI 2 | StartStopStatus_XXX | Actual on/off status | Read |
| AI 9 | RoomTemp_XXX | Room temperature (reference value) | Read |
| BI 3 | Alarm_XXX | Indoor unit malfunction alarm | Read |
| MI 4 | MalfunctionCode_XXX | Daikin malfunction code | Read |
| BI 20 | CommunicationStatus_XXX | Communication error with the unit | Read |
Enable & remote start
There is no separate enable: the BMS writes the command objects directly. Remote-controller lockouts are available per group (RemoteControlStart, RemoteControlAirConModeSet, RemoteControlTempAdjust = Prohibit), and CL_Rejection (only on 000/064/128/192) disables Daikin centralized controllers on that DIII-Net line. SystemForcedOff stops all units on a DIII-Net line and blocks remote-controller starts; clearing it does not restart the units, so the BMS (or another controller) must start them again.
Network setup
- BACnet/IP port factory setting 47808 (settable 1-65535).
- Can register as a BACnet foreign device when a BBMD is on another subnet.
- After power-up the interface needs about one minute to discover indoor units; reads return UNKNOWN_OBJECT until then.
- The interface can communicate with at most 100 BACnet networks.
Watch out for
- Setpoint, On/Off, mode, airflow direction and fan speed are stored in indoor-unit non-volatile memory with a write-count limit; avoid cyclic writes.
- Out-of-range setpoints are rounded to the unit's min/max, and F/C conversion can return a value slightly different from what was written; do not keep resending until they match.
- Room temperature from the return air sensor can be skewed when the fan is off or during defrost; treat it as a reference only.
- Daikin centralized controllers keep the ability to change on/off, mode and setpoint unless CL_Rejection is active.
Daikin DMS502B71 Interface for use in BACnet 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 | |||||
|---|---|---|---|---|---|---|
| BOmin | 1 | StartStopCommand_XXX | On/Off setting | Command | Inactive=Off, Active=On | |
| BImin | 2 | StartStopStatus_XXX | On/Off status | Read | Inactive=Off, Active=On | |
| BImin | 3 | Alarm_XXX | Alarm | Read | Inactive=Normal, Active=Malfunction | |
| MImin | 4 | MalfunctionCode_XXX | Malfunction code | Read | 1=Normal, other states=Daikin-specified malfunction code | |
| MOmin | 5 | AirConModeCommand_XXX | Operation mode setting | Command | 1=Cool, 2=Heat, 3=Fan, 4=Auto, 5=Dry | |
| MI | 6 | AirConModeStatus_XXX | Operation mode status | Read | 1=Cool, 2=Heat, 3=Fan, 4=not used, 5=Dry | |
| MOmin | 7 | AirFlowRateCommand_XXX | Fan speed setting | Command | 1=Low, 2=High, 3=Middle, 4=Auto | |
| MI | 8 | AirFlowRateStatus_XXX | Fan speed status | Read | 1=Low, 2=High, 3=Middle, 4=Auto | |
| AImin | 9 | RoomTemp_XXX | Measured room temperature | °C/°F | Read | |
| AVmin | 10 | TempAdjust_XXX | Setpoint | °C/°F | Write | |
| BI | 11 | FilterSign_XXX | Filter sign signal | Read | Inactive=No, Active=Yes | |
| BV | 12 | FilterSignReset_XXX | Filter sign signal reset | Write | Reset | |
| BV | 13 | RemoteControlStart_XXX | Remote controller permit/prohibit (On/Off) | Write | Inactive=Permit, Active=Prohibit | |
| BV | 14 | RemoteControlAirConModeSet_XXX | Remote controller permit/prohibit (operation mode) | Write | Inactive=Permit, Active=Prohibit | |
| BV | 16 | RemoteControlTempAdjust_XXX | Remote controller permit/prohibit (setpoint) | Write | Inactive=Permit, Active=Prohibit | |
| BV | 17 | CL_Rejection_XXX | Centralized control (lower central control disable) | Write | Inactive=Enabled, Active=Disabled | |
| ACC | 18 | GasTotalPower_XXX | Accumulated gas | m3 | Read | |
| ACC | 19 | ElecTotalPower_XXX | Accumulated power | kWh | Read | |
| BImin | 20 | CommunicationStatus_XXX | Communication status | Read | Inactive=Normal, Active=Communication error | |
| BV | 21 | SystemForcedOff_XXX | Forced system stop | Write | Inactive=Inactive, Active=Active | |
| AV | 22 | AirDirectionCommand_XXX | Airflow direction setting | Write | ||
| AI | 23 | AirDirectionStatus_XXX | Airflow direction status | Read | ||
| BO | 24 | ForcedThermoOFFCommand_XXX | Forced thermo-off setting | Command | Inactive=Inactive, Active=Active | |
| BI | 25 | ForcedThermoOFFStatus_XXX | Forced thermo-off status | Read | Inactive=Inactive, Active=Active | |
| BO | 26 | EnergyEfficiencyCommand_XXX | Energy saving setting | Command | Inactive=Inactive, Active=Active | |
| BI | 27 | EnergyEfficiencyStatus_XXX | Energy saving status | Read | Inactive=Inactive, Active=Active | |
| BI | 28 | ThermoStatus_XXX | Thermo-on status | Read | Inactive=Off, Active=On | |
| BI | 29 | CompressorStatus_XXX | Compressor status | Read | Inactive=Off, Active=On | |
| BI | 30 | IndoorFanStatus_XXX | Indoor fan status | Read | Inactive=Off, Active=On | |
| BI | 31 | HeaterStatus_XXX | Heater status | Read | Inactive=Off, Active=On | |
| MO | 32 | VentilationModeCommand_XXX | Ventilation mode setting (ERV) | Command | 1=Bypass, 2=ERV, 3=Auto | |
| MI | 33 | VentilationModeStatus_XXX | Ventilation mode status (ERV) | Read | 1=Bypass, 2=ERV, 3=Auto | |
| MO | 34 | VentilationAmountCommand_XXX | Ventilation amount setting (ERV) | Command | 1=Low, 2=High, 3=Auto, 4=Low (fresh up), 5=High (fresh up), 6=Auto (fresh up) | |
| MI | 35 | VentilationAmountStatus_XXX | Ventilation amount status (ERV) | Read | 1=Low, 2=High, 3=Auto, 4=Low (fresh up), 5=High (fresh up), 6=Auto (fresh up) |
No points match these filters.
Integration notes
- Instances shown are for indoor unit 000. For unit number N, instance = N x 256 + member number, and XXX in the name is N (000-255).
- DIII-Net port 1 covers units 000-063, port 2 064-127, ports 3 and 4 (DAM411B51 option) 128-255.
- Member 15 is blank. Members 17 (centralized control) and 21 (forced system stop) exist only for units 000, 064, 128 and 192.
- Accumulated gas and power need the optional power-proportional-distribution setup; ERV members apply to VAM units.
- Setpoint, On/Off, mode, airflow direction and fan speed are saved to indoor-unit non-volatile memory; avoid frequent writes.
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 DMS502B71 Interface for use in BACnet 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 Daikin DMS502B71 Interface for use in BACnet
How many BACnet points does the Daikin DMS502B71 Interface for use in BACnet have?
This list has 34 BACnet objects: 2 analog inputs, 2 analog values, 10 binary inputs, 3 binary outputs, 6 binary values, 5 multi-state inputs, 4 multi-state outputs, 2 accumulators. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Daikin DMS502B71 Interface for use in BACnet BACnet points are writable?
15 of the 34 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 Daikin DMS502B71 Interface for use in BACnet BACnet documentation?
The source is Design Guide - Interface for use in BACnet (DMS502B71 / DAM411B51) (EDUS72-749C), published free by Daikin at https://daikincomfort.com/docs/default-source/interface-for-use-bacnet-/eg-dms502b71bacnet-guide.pdf.
What are the minimum BACnet points to integrate the Daikin DMS502B71 Interface for use in BACnet?
Start with BO 1 StartStopCommand_XXX (Start/stop the indoor unit group); MO 5 AirConModeCommand_XXX (Operation mode command); AV 10 TempAdjust_XXX (Setpoint); MO 7 AirFlowRateCommand_XXX (Fan speed command); BI 2 StartStopStatus_XXX (Actual on/off status); AI 9 RoomTemp_XXX (Room temperature (reference value)); BI 3 Alarm_XXX (Indoor unit malfunction alarm); MI 4 MalfunctionCode_XXX (Daikin malfunction code); BI 20 CommunicationStatus_XXX (Communication error with the unit).
How do I enable BMS control of the Daikin DMS502B71 Interface for use in BACnet?
There is no separate enable: the BMS writes the command objects directly. Remote-controller lockouts are available per group (RemoteControlStart, RemoteControlAirConModeSet, RemoteControlTempAdjust = Prohibit), and CL_Rejection (only on 000/064/128/192) disables Daikin centralized controllers on that DIII-Net line. SystemForcedOff stops all units on a DIII-Net line and blocks remote-controller starts; clearing it does not restart the units, so the BMS (or another controller) must start them again.
How do I check these points on the real DMS502B71 Interface for use in BACnet?
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 Daikin BACnet points lists
- Networked room thermostat
Daikin AppStat BACnet Thermostat (DAPPS)
Daikin light commercial rooftop units and heat pumps controlled by the BACnet AppStat thermostat.
Also known as: DAPPS, AppStat, BACnet AppStat, Daikin BACnet thermostat, 250803, DG-DAPPS - VRV BACnet gateway (iTM option)
Daikin intelligent Touch Manager (iTM) BACnet Server Gateway DCM014A51 - Indoor Unit and System Objects
VRV and ductless indoor unit groups managed by a Daikin intelligent Touch Manager with the DCM014A51 BACnet server option.
Also known as: DCM014A51, iTM BACnet, intelligent Touch Manager, DCM601A71, DCM601B71, iTM BACnet Server Gateway - VRV BACnet gateway (iTM option)
Daikin intelligent Touch Manager (iTM) BACnet Server Gateway DCM014A51 - Outdoor Unit Objects
VRV outdoor units (main, sub-1 and sub-2 modules) monitored through an iTM with the DCM014A51 BACnet server option.
Also known as: DCM014A51, iTM BACnet outdoor unit, intelligent Touch Manager, DCM601A71, DCM601B71
Source: Design Guide - Interface for use in BACnet (DMS502B71 / DAM411B51) · EDUS72-749C. Object names, instances and units are reproduced as published; descriptions are our own.