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Thermostat (BACnet MS/TP) · BACnet points list
Strato Automation OPENSTAT OS537 thermostat, FCU firmware BACnet points list
Updated 12 November 2026
In its fan coil application the OS537 drives on/off, floating or 0-10 V valves, a three-speed or ECM fan and an auxiliary output (reheat, occupancy, fan or network-controlled) over BACnet MS/TP. The object list has setpoints, mode, fan and occupancy commands, door, window, filter and service inputs, changeover and fan status, demands and two PID loops.
This page lists 108 BACnet objects for the Strato Automation OPENSTAT OS537 thermostat, FCU firmware — 66 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Strato Automation’s own free documentation, linked below.
- Manufacturer
- Strato Automation
- Model
- OPENSTAT OS537 thermostat, FCU firmware
- Equipment
- Thermostat (BACnet MS/TP)
- Equipment type
- Thermostats, sensors & meters
- BACnet objects
- 108 (66 writable)
- Transport
- BACnet MS/TP
- Firmware
- Universal firmware 1.2.6 and later
- Also known as
- OS537, OS537H, OS537MHC, OpenStat OS537, OS537-FCU, Strato OS537
Reference only, provided as-is: verify against Strato Automation’s current documentation and the live device before use. Not official Strato Automation information. Terms of use.
BMS integration notes: Strato Automation OPENSTAT OS537 thermostat, FCU firmware
Command system mode (MSV-16), fan mode (MSV-17) and occupancy (MSV-6) and write the room setpoint (AV-1). Read room temperature, demands, fan status and the door, window, filter and service status points.
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 16 | MODE | System mode: Off, Auto, Cool, Heat | Write |
| MV 17 | FAN | Fan mode: Lo, Med, Hi, Auto | Write |
| MV 6 | Occ_Cmd | Occupancy command: local, occupied, unoccupied | Write |
| AV 1 | RoomTSP | Room temperature setpoint | Write |
| AI 6 | RoomT | Room temperature | Read |
| MV 5 | Eff_Occ | Effective occupancy | Read |
| AV 21 | HTG_Dem | Heating demand, % | Read |
| AV 22 | CLG_Dem | Cooling demand, % | Read |
| BV 15 | FanStat | Fan running status | Read |
| MV 100 | HELP_mess | Alarm message: Service, Filter, Window | Read |
Enable & remote start
MSV-6 Occ_Cmd (tagged Cmd) sets occupancy from the BMS; BV-14 Aux_Cmd switches the auxiliary output when MSV-54 = Network.
Network setup
- MS/TP address and baud are set in the MSTP Config menu.
- Strato recommends writing MSVs and AVs at the default priority (16) and everything else at priority 8 down to 3.
Watch out for
- MSV-52 (pipes), MSV-15 (sequence), BV-75 (valve type) and MSV-58 (fan sequence) are commissioning settings.
Strato Automation OPENSTAT OS537 thermostat, FCU firmware 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 | |||||
|---|---|---|---|---|---|---|
| BO | 1 | BO_1 | Binary output 1 | Command | ||
| BO | 2 | BO_2 | Binary output 2 | Command | ||
| BO | 3 | BO_3 | Binary output 3 | Command | ||
| BO | 4 | BO_4 | Binary output 4 | Command | ||
| BO | 5 | BO_High | High-speed fan output | Command | ||
| BO | 6 | BO_Med | Medium-speed fan output | Command | ||
| BO | 7 | BO_Low | Low-speed fan output | Command | ||
| AO | 1 | AO_ECM | Fan ECM output; dependent on MSV-58 | Command | ||
| AO | 2 | AO_2 | Analog output 2 | % | Command | |
| AO | 3 | AO_3 | Analog output 3 | % | Command | |
| AI | 1 | AI_1 | Analog input 1; dependent on MSV-46 | Read | ||
| AI | 3 | AI_3 | Analog input 3; dependent on MSV-48 | Read | ||
| AI | 4 | AI_4 | Remote room sensor | °F | Read | |
| AI | 5 | AI_5 | Unused | Read | ||
| AImin | 6 | RoomT | Room temperature | °F | Read | |
| AI | 7 | RoomRH | Room humidity | % | Read | |
| AI | 8 | RoomCO2 | Room CO2 | ppm | Read | |
| BI | 1 | Motion | Motion detection | Read | Off / Active | |
| AVmin | 1 | RoomTSP | Room Temperature setpoint (range 54-90°F (12-32°C)) | °F | Write | |
| AV | 7 | Eff_T | Effective temperature used for control (range -40-122°F (-40-50°C)) | °F | Read | |
| AV | 9 | OATemp | Outdoor air temperature (range -40-122°F (-40-50°C)) | °F | Read | |
| AV | 12 | SATemp | Supply air temperature (range -40-122°F (-40-50°C)) | °F | Read | |
| AV | 13 | CHOV_T | Changeover temperature (range -40-122°F (-40-50°C)) | °F | Read | |
| AVmin | 21 | HTG_Dem | Heating demand (range 0-100%) | % | Read | |
| AVmin | 22 | CLG_Dem | Cooling demand (range 0-100%) | % | Read | |
| AV | 23 | Fan_HT__Demand | Fan heating demand (range 0-100%) | % | Read | |
| AV | 24 | Fan_CL__Demand | Fan cooling demand (range 0-100%) | % | Read | |
| AV | 25 | ECM_Min | ECM minimum speed output (range 0-100%) | % | Write | |
| AV | 27 | OvrTime_Set | Set occupancy override time (range 15 – 480 min) | min | Write | |
| AV | 28 | MotionOvrTime_Set | Motion Set occupancy override time (range 1 – 60 min) | min | Write | |
| AV | 30 | EffHTSP | Effective heating setpoint | Read | ||
| AV | 31 | EffCLSP | Effective cooling setpoint | Read | ||
| AV | 39 | OccHTSP | Occupied heating setpoint | Read | ||
| AV | 40 | OccCLSP | Occupied cooling setpoint | Read | ||
| AV | 41 | STBHTSP | Standby heating setpoint | °F | Write | |
| AV | 42 | STBCLSP | Standby cooling setpoint | °F | Write | |
| AV | 43 | Unoc_HT_SP | Unoccupied heating setpoint | °F | Write | |
| AV | 44 | Unoc_CL_SP | Unoccupied cooling setpoint | °F | Write | |
| AV | 50 | RT_Cal | Room temperature calib (range -5 to 5) | Write | ||
| AV | 58 | MaxHTSP | Maximum heating setpoint (range 40-90°F (4.5-32°C)) | °F | Write | |
| AV | 59 | MinCLSP | Minimum cooling setpoint (range 54-100°F (12-37.5°C)) | °F | Write | |
| AV | 63 | SP_DB | Setpoint deadband (range 2 to 5) | Write | ||
| BV | 2 | OVRSTAT | Occupancy override status | Read | Inactive = Normal, Active = Overrid | |
| BV | 3 | Mot_Det | Motion detection | Read | Inactive = None, Active = Moving | |
| BV | 5 | OccSch | System occupancy schedule | Read | Inactive = Off, Active = On | |
| BV | 14 | Aux_Cmd | Auxiliary network command | Write | Inactive = Off, Active = On | |
| BVmin | 15 | FanStat | Fan status | Read | Inactive = Stopped, Active = Running | |
| BV | 25 | AuxStat | Auxiliary output status | Read | Inactive = Off, Active = On | |
| BV | 29 | AI1Stat | Analog input 1 binary contact status | Read | Inactive = Deactivated, Active = Activated | |
| BV | 30 | AI2Stat | Analog input 2 binary contact status | Read | Inactive = Deactivated, Active = Activated | |
| BV | 31 | AI3Stat | Analog input 3 binary contact status | Read | Inactive = Deactivated, Active = Activated | |
| BV | 35 | Window | Window detection status | Read | Inactive = Close, Active = Open | |
| BV | 36 | Filter | Filter sensor status | Read | Inactive = Normal, Active = Alarm | |
| BV | 37 | ServALM | Service alarm status | Read | Inactive = Normal, Active = Alarm | |
| BV | 38 | Door | Door detection status | Read | Inactive = Close, Active = Open | |
| BV | 40 | Ch_Over | Change over status | Read | Inactive = Cool, Active = Heat | |
| BV | 50 | AutoMod | Auto mode authorized | Write | Inactive = No, Active = Yes | |
| BV | 64 | Reh_Opt | Reheat control option | Write | Inactive = Pulse1S, Active = On-Off | |
| BV | 66 | KeepFan | Fan auto mode | Write | Inactive = Fan Low, Active = Fan Off | |
| BV | 75 | VALVCTL | Valve motor control type | Write | Inactive = On-Off, Active = Floating | |
| BV | 78 | AO2_Dir | AO2 action | Write | Inactive = Direct, Active = Reverse | |
| BV | 79 | AO3_Dir | AO3 action | Write | Inactive = Direct, Active = Reverse | |
| BV | 200 | LockStPoint | Lock Setpoint | Write | Inactive = Unlock, Active = Lock | |
| BV | 201 | LockMode | Lock Mode | Write | Inactive = Unlock, Active = Lock | |
| BV | 202 | LockFan | Lock Fan | Write | Inactive = Unlock, Active = Lock | |
| BV | 203 | WifiStatus | Wifi Status | Read | Inactive = Off, Active = On | |
| MV | 2 | Tsource | Temperature input location | Write | 1 = AutoDet, 2 = Intern, 3 = AI-4 | |
| MVmin | 5 | Eff_Occ | Effective occupancy mode | Read | 1 = Occupied, 2 = Unoccup, 3 = TempOcc, 4 = Standby | |
| MVmin | 6 | Occ_Cmd | Occupancy command | Write | 1 = Loc_Occ, 2 = Occupied, 3 = Unoccup | |
| MV | 15 | SeqOper | Control sequence of operation | Write | 1 = Cooling, 2 = Heating, 3 = Cool-Rt, 4 = Heat-Rt, 5 = Cl-Ht | |
| MVmin | 16 | MODE | System mode | Write | 1 = Off, 2 = Auto, 3 = Cool, 4 = Heat | |
| MVmin | 17 | FAN | Fan mode | Write | 1 = Lo, 2 = Med, 3 = Hi, 4 = Auto | |
| MV | 19 | KeyLock | Keypad lock level | Write | 1 = None, 2 = Fan, 3 = Mode, 4 = FanMode, 5 = All | |
| MV | 26 | BO3_BO4 | BO3/BO4 status | Read | 1 = Stopped, 2 = Open, 3 = Close | |
| MV | 27 | BO1_BO2 | BO1/BO2 status | Read | 1 = Stopped, 2 = Open, 3 = Close | |
| MV | 28 | FanStat | Fan status | Read | 1 = Off, 2 = Low, 3 = Med, 4 = High | |
| MV | 44 | Bi_PIR | Select PIR Motion sensor input | Write | 1 = None, 2 = NO, AI1 (BI), 3 = NC, AI1 (BI), 4 = NO, AI2 (BI), 5 = NC, AI2 (BI), 6 = NO, AI3 (BI), 7 = NC, AI3 (BI), 8 = NO, AI4 (BI), 9 = NC, AI4 (BI), 10 = NO, AI5 (BI), 11 = NC, AI5 (BI), 12 = External, 13 = Intern | |
| MV | 45 | BI_SCH_Input | Select schedule input | Write | 1 = None (Off), 2 = None (On), 3 = Scheduler, 4 = AI-1, 5 = AI-2, 6 = AI-3, 7 = AI-4, 8 = AI-5, 9 = External | |
| MV | 47 | AI2_CFG | CFG Analog input 2 | Write | 1 = None, 2 = Overrid (remote override switch), 3 = Filter, 4 = Service | |
| MV | 48 | AI3_CFG | CFG Analog input 3 | Write | 1 = None, 2 = COC/NH (Normally Heat ChangeOver Contact), 3 = COC/NH (Normally Cool ChangeOver Contact), 4 = COS (ChangeOver Sensor), 5 = SS (Supply sensor remote monitoring 10K type 3 sensor) | |
| MV | 49 | Door_Loc | Door contact input location | Write | 1 = None, 2 = AI-1, 3 = AI-2, 4 = AI-3, 5 = AI-4, 6 = AI-5 | |
| MV | 51 | Windows_Loc | Window contact input location | Write | 1 = None, 2 = AI-1, 3 = AI-2, 4 = AI-3, 5 = AI-4, 6 = AI-5 | |
| MV | 50 | AI5_CFG | CFG Analog Input 5 | Write | 1 = None, 2 = Fan Lock | |
| MV | 52 | PipeNum | Pipe number | Write | 1 = 2 Pipes, 2 = 4 Pipes | |
| MV | 54 | Aux_CFG | Auxiliary output configuration | Write | 1 = Reheat, 2 = Occ-NO, 3 = Occ-NC, 4 = Fan-NO, 5 = Fan-NC, 6 = Network (Can be controlled by BACnet) | |
| MV | 55 | Reheat | Reheat type | Write | 1 = Basebrd, 2 = Coil | |
| MV | 58 | Fan_Seq | Control fan sequence | Write | 1 = L-M-H, 2 = L-H, 3 = L-M-H-A, 4 = L-H-A, 5 = On-Auto (Single speed or 0-10Vdc) | |
| MV | 65 | PB | Heating/Cooling proportional band | Write | Range: 3 F (1.2 C) - 10 F (5.6 C) | |
| MV | 70 | Display_SP | Setpoint displayed for user | Write | 1 = Heating, 2 = Center, 3 = Cooling | |
| MV | 75 | BO3Time | BO3/BO4 travel time for 3 states valve | Write | Range: 0.5 min - 6 min | |
| MV | 76 | BO1Time | BO1/BO2 travel time for 3 states valve | Write | Range: 0.5 min - 6 min | |
| MV | 77 | CL_CPH | Cooling output cycle per hour | Write | Range: 3 - 8 CPH | |
| MV | 78 | HT_CPH | Heating output cycle per hour | Write | Range: 3 - 8 CPH | |
| MVmin | 100 | HELP_mess | Help message | Read | 1 = Normal, 2 = Service, 3 = Filter, 4 = Window | |
| MV | 200 | Brightness | Brightness Control | Write | 1 = Low, 2 = Med-Low, 3 = Med | |
| MV | 201 | BgColor | Background Color | Write | 1 = White, 2 = Orange, 3 = Blue, 4 = Green, 5 = Red | |
| MV | 202 | MainDisplay | Main Display | Write | 1 = Temp, 2 = Setpoint, 3 = Nothing | |
| MV | 203 | Language | Language selection | Write | 1 = English | |
| MV | 204 | Display_Units | Temperature displayed units | Write | 1 = C, 2 = F | |
| MV | 205 | System_Unit | System/Database Unit | Write | 1 = Metric, 2 = Imperial | |
| MV | 221 | Radar_Status | Radar_status | Write | 1 = Disable, 2 = Enable | |
| MV | 223 | Detection_range | Detection_range | Write | Range: 1_m to 7_m | |
| MV | 235 | Radar_Freq | pll_frequency_word | Write | Range: Channel 1 to 8 | |
| MV | 244 | Sensitivity | duty_cycle_repetition_r | Write | 1 = Low, 2 = Medium, 3 = High, 4 = very-high | |
| LO | 1 | PIDZoneCool | PID Zone cooling | % | Read | |
| LO | 2 | PIDZoneHeat | PID Zone heating | % | Read | |
| SCH | 1 | OccSchedule | Occupancy schedule | Write | ||
| AI | 2 | AI_2 | Analog input 2; dependent on MSV-47 | Read |
No points match these filters.
Object ID lookup: Strato Automation OPENSTAT OS537 thermostat, FCU firmware point IDs by name
BO1BO_1BO2BO_2BO3BO_3BO4BO_4BO5BO_HighBO6BO_MedBO7BO_LowAO1AO_ECMAO2AO_2AO3AO_3AI1AI_1AI3AI_3AI4AI_4AI5AI_5AI6RoomTAI7RoomRHAI8RoomCO2BI1MotionAV1RoomTSPAV7Eff_TAV9OATempAV12SATempAV13CHOV_TAV21HTG_DemAV22CLG_DemAV23Fan_HT__DemandAV24Fan_CL__DemandAV25ECM_MinAV27OvrTime_SetAV28MotionOvrTime_SetAV30EffHTSPAV31EffCLSPAV39OccHTSPAV40OccCLSPAV41STBHTSPAV42STBCLSPAV43Unoc_HT_SPAV44Unoc_CL_SPAV50RT_CalAV58MaxHTSPAV59MinCLSPAV63SP_DBBV2OVRSTATBV3Mot_DetBV5OccSchBV14Aux_CmdBV15FanStatBV25AuxStatBV29AI1StatBV30AI2StatBV31AI3StatBV35WindowBV36FilterBV37ServALMBV38DoorBV40Ch_OverBV50AutoModBV64Reh_OptBV66KeepFanBV75VALVCTLBV78AO2_DirBV79AO3_DirBV200LockStPointBV201LockModeBV202LockFanBV203WifiStatusMV2TsourceMV5Eff_OccMV6Occ_CmdMV15SeqOperMV16MODEMV17FANMV19KeyLockMV26BO3_BO4MV27BO1_BO2MV28FanStatMV44Bi_PIRMV45BI_SCH_InputMV47AI2_CFGMV48AI3_CFGMV49Door_LocMV51Windows_LocMV50AI5_CFGMV52PipeNumMV54Aux_CFGMV55ReheatMV58Fan_SeqMV65PBMV70Display_SPMV75BO3TimeMV76BO1TimeMV77CL_CPHMV78HT_CPHMV100HELP_messMV200BrightnessMV201BgColorMV202MainDisplayMV203LanguageMV204Display_UnitsMV205System_UnitMV221Radar_StatusMV223Detection_rangeMV235Radar_FreqMV244SensitivityLO1PIDZoneCoolLO2PIDZoneHeatSCH1OccScheduleAI2AI_2
Integration notes
- The guide has no read/write column. Access here follows its tags: Cfg, User and Cmd objects are shown writable, Status objects read-only, and BO/AO objects commandable (the guide lists them for output overrides).
- AI-2 is printed in the I/O table without a row border and was read from the page text.
- AI-8 RoomCO2 exists only on C models such as the OS537MHC.
- BV-14 Aux_Cmd drives the auxiliary output when MSV-54 is set to Network.
- Multistate state numbers follow the order the states are printed, starting at 1; several MSVs print a range instead.
- MSV-48 prints 'COC/NH' for both changeover contact options; the second is described as normally cool.
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 OPENSTAT OS537 thermostat, FCU firmware 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 Strato Automation OPENSTAT OS537 thermostat, FCU firmware
How many BACnet points does the Strato Automation OPENSTAT OS537 thermostat, FCU firmware have?
This list has 108 BACnet objects: 8 analog inputs, 3 analog outputs, 24 analog values, 1 binary input, 7 binary outputs, 24 binary values, 2 loops, 1 schedule, 38 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Strato Automation OPENSTAT OS537 thermostat, FCU firmware BACnet points are writable?
66 of the 108 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 Strato Automation OPENSTAT OS537 thermostat, FCU firmware BACnet documentation?
The source is OS537 (Universal Firmware) User Guide, Fan Coil Unit (FCU) - BACnet Objects, revision July 2026 rev 0, published free by Strato Automation at https://stratoautomation.com/wp-content/uploads/2025/08/OS537-User-Guide-July-2026-rev-0.pdf.
What are the minimum BACnet points to integrate the Strato Automation OPENSTAT OS537 thermostat, FCU firmware?
Start with MV 16 MODE (System mode: Off, Auto, Cool, Heat); MV 17 FAN (Fan mode: Lo, Med, Hi, Auto); MV 6 Occ_Cmd (Occupancy command: local, occupied, unoccupied); AV 1 RoomTSP (Room temperature setpoint); AI 6 RoomT (Room temperature); MV 5 Eff_Occ (Effective occupancy); AV 21 HTG_Dem (Heating demand, %); AV 22 CLG_Dem (Cooling demand, %); BV 15 FanStat (Fan running status); MV 100 HELP_mess (Alarm message: Service, Filter, Window).
How do I enable BMS control of the Strato Automation OPENSTAT OS537 thermostat, FCU firmware?
MSV-6 Occ_Cmd (tagged Cmd) sets occupancy from the BMS; BV-14 Aux_Cmd switches the auxiliary output when MSV-54 = Network.
How do I check these points on the real OPENSTAT OS537 thermostat, FCU firmware?
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 Strato Automation BACnet points lists
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Source: OS537 (Universal Firmware) User Guide, Fan Coil Unit (FCU) - BACnet Objects · rev. July 2026 rev 0. Object names, instances and units are reproduced as published; descriptions are our own.