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Laboratory room pressure and airflow offset controller · BACnet points list
TSI SureFlow 8681 Adaptive Offset Controller BACnet points list
Updated 6 November 2026
The SureFlow 8681 controls a laboratory room by tracking supply, general exhaust and fume hood flow to hold a flow offset, trimming the offset to keep a room pressure setpoint, and running a reheat valve for temperature. Over BACnet MS/TP it exposes room pressure, all flows and the current offset, temperature, damper and valve positions, setpoints and alarm limits, occupancy and emergency commands, and a Status Index alarm code.
This page lists 31 BACnet objects for the TSI SureFlow 8681 Adaptive Offset Controller — 18 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from TSI’s own free documentation, linked below.
- Manufacturer
- TSI
- Model
- SureFlow 8681 Adaptive Offset Controller
- Equipment
- Laboratory room pressure and airflow offset controller
- Equipment type
- Thermostats, sensors & meters
- BACnet objects
- 31 (18 writable)
- Transport
- BACnet MS/TP
- Firmware
- 1.0 (PICS)
- Default device instance
- 868001
- Also known as
- 8681, 8681-BAC, SureFlow 8681
Reference only, provided as-is: verify against TSI’s current documentation and the live device before use. Not official TSI information. Terms of use.
BMS integration notes: TSI SureFlow 8681 Adaptive Offset Controller
Command occupancy with Occ/Unocc Mode (BV 1) and use Emergency Mode (MV 2) for purge. Read room pressure, the supply, exhaust and hood flows, the current offset, temperature and the Status Index (MI 1) for alarms.
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 |
|---|---|---|---|
| BV 1 | Occ/Unocc Mode | 0 = occupied, 1 = unoccupied | Write |
| MV 2 | Emergency Mode | 1 = exit, 2 = enter emergency mode, 3 = normal | Write |
| AV 2 | Room Pressure Setpoint | Room pressure setpoint | Write |
| AV 14 | Temperature Setpoint | Occupied room temperature setpoint | Write |
| AI 1 | Room Pressure | Room differential pressure | Read |
| AI 2 | Supply Flow Rate | Supply airflow | Read |
| AI 4 | General Exhaust Flow Rate | General exhaust airflow | Read |
| AI 6 | Hood Flow Rate | Fume hood exhaust airflow | Read |
| AI 8 | Temperature | Room temperature | Read |
| MI 1 | Status Index | Alarm state; 1 = normal, 7 = emergency | Read |
Enable & remote start
Occ/Unocc Mode (BV 1) switches between the occupied and unoccupied flow and temperature setpoints; Emergency Mode (MV 2) works like the EMERGENCY key.
Network setup
- BACnet MS/TP master at 9600, 19.2k, 38.4k or 76.8k baud (PICS).
- Set the MS/TP MAC with the MAC ADDRESS menu item (1-127).
- The device instance is 868000 plus the MAC address (MAC 1 gives 868001).
Watch out for
- Pressure units change with Units Value (MV 3); check it before scaling pressures in the BMS.
- The device instance changes if the MAC address is changed.
- Setpoints and alarm limits are stored settings; do not write them cyclically.
TSI SureFlow 8681 Adaptive Offset Controller 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 | Room Pressure | ft/min, m/s, in. H2O, Pa | Read | ||
| AImin | 2 | Supply Flow Rate | cfm, l/s | Read | ||
| AI | 3 | Supply Flow Setpoint | cfm, l/s | Read | ||
| AImin | 4 | General Exhaust Flow Rate | cfm, l/s | Read | ||
| AI | 5 | General Exhaust Flow Setpoint | cfm, l/s | Read | ||
| AImin | 6 | Hood Flow Rate | cfm, l/s | Read | ||
| AI | 7 | Current Flow Offset | cfm, l/s | Read | ||
| AImin | 8 | Temperature | °F, °C | Read | ||
| AI | 9 | Supply Damper Position | % open | Read | ||
| AI | 10 | Exhaust Damper Position | % open | Read | ||
| AI | 11 | Reheat Valve Position | % open | Read | ||
| AV | 1 | MAC Address | Range 1 to 127 | Write | ||
| AVmin | 2 | Room Pressure Setpoint | Range -0.195 to 0.195 in. H2O | ft/min, m/s, in. H2O, Pa | Write | |
| AV | 3 | Low Pressure Alarm | Range -0.195 to 0.195 in. H2O | ft/min, m/s, in. H2O, Pa | Write | |
| AV | 4 | High Pressure Alarm | Range -0.195 to 0.195 in. H2O | ft/min, m/s, in. H2O, Pa | Write | |
| AV | 5 | Vent Min Setpoint | Range 0 to 30,000 cfm | cfm, l/s | Write | |
| AV | 6 | Cooling Flow Setpoint | Range 0 to 30,000 cfm | cfm, l/s | Write | |
| AV | 7 | Unocc Flow Setpoint | Range 0 to 30,000 cfm | cfm, l/s | Write | |
| AV | 8 | Max Supply Setpoint | Range 0 to 30,000 cfm | cfm, l/s | Write | |
| AV | 9 | Min Exhaust Setpoint | Range 0 to 30,000 cfm | cfm, l/s | Write | |
| AV | 10 | Min Offset | Range 0 to 30,000 cfm | cfm, l/s | Write | |
| AV | 11 | Max Offset | Range 0 to 30,000 cfm | cfm, l/s | Write | |
| AV | 12 | Min Supply Alarm | Range 0 to 30,000 cfm | cfm, l/s | Write | |
| AV | 13 | Max Exhaust Alarm | Range 0 to 30,000 cfm | cfm, l/s | Write | |
| AVmin | 14 | Temperature Setpoint | Range 50 to 85 °F | °F, °C | Write | |
| AV | 15 | Unocc Temp Setpoint | Range 50 to 85 °F | °F, °C | Write | |
| BVmin | 1 | Occ/Unocc Mode | Write | 0=Occupied, 1=Unoccupied | ||
| MImin | 1 | Status Index | Read | 1=Normal, 2=Low Press Alarm, 3=High Press Alarm, 4=Max Exhaust Alarm, 5=Min Supply Alarm, 6=Data Error, 7=Emergency | ||
| MVmin | 2 | Emergency Mode | Write | 1=Exit Emergency Mode, 2=Enter Emergency Mode, 3=Normal | ||
| MV | 3 | Units Value | Write | 1=ft/min, 2=m/s, 3=in. H2O, 4=Pa | ||
| DEV | 868001 | TSI8681 | Device object; instance = 868000 + MAC address | Read |
No points match these filters.
Object ID lookup: TSI SureFlow 8681 Adaptive Offset Controller point IDs by name
AI1Room PressureAI2Supply Flow RateAI3Supply Flow SetpointAI4General Exhaust Flow RateAI5General Exhaust Flow SetpointAI6Hood Flow RateAI7Current Flow OffsetAI8TemperatureAI9Supply Damper PositionAI10Exhaust Damper PositionAI11Reheat Valve PositionAV1MAC AddressAV2Room Pressure SetpointAV3Low Pressure AlarmAV4High Pressure AlarmAV5Vent Min SetpointAV6Cooling Flow SetpointAV7Unocc Flow SetpointAV8Max Supply SetpointAV9Min Exhaust SetpointAV10Min OffsetAV11Max OffsetAV12Min Supply AlarmAV13Max Exhaust AlarmAV14Temperature SetpointAV15Unocc Temp SetpointBV1Occ/Unocc ModeMI1Status IndexMV2Emergency ModeMV3Units Value
Integration notes
- From the Model 8681-BAC BACnet MS/TP Object Set table (manual pages 69-70).
- The table has no read/write column. Access is inferred from the PICS, which lists Present_Value as writable for Analog, Binary and Multi-state Values only.
- Units follow Units Value (MV 3): 1 = ft/min, 2 = m/s, 3 = in. H2O, 4 = Pa; English units (cfm, °F) apply with 1 or 3. English is the default.
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 SureFlow 8681 Adaptive Offset Controller 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 TSI SureFlow 8681 Adaptive Offset Controller
How many BACnet points does the TSI SureFlow 8681 Adaptive Offset Controller have?
This list has 31 BACnet objects: 11 analog inputs, 15 analog values, 1 binary value, 1 device, 1 multi-state input, 2 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which TSI SureFlow 8681 Adaptive Offset Controller BACnet points are writable?
18 of the 31 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 TSI SureFlow 8681 Adaptive Offset Controller BACnet documentation?
The source is SureFlow Adaptive Offset Controller Models 8681/8681-BAC Operation and Service Manual (P/N 1980476), revision Revision E, February 2013, published free by TSI at https://tsi.com/getmedia/117e0f6f-b829-4b6b-a0d7-db6fc17437f1/1980476d-8681?ext=.pdf.
What are the minimum BACnet points to integrate the TSI SureFlow 8681 Adaptive Offset Controller?
Start with BV 1 Occ/Unocc Mode (0 = occupied, 1 = unoccupied); MV 2 Emergency Mode (1 = exit, 2 = enter emergency mode, 3 = normal); AV 2 Room Pressure Setpoint (Room pressure setpoint); AV 14 Temperature Setpoint (Occupied room temperature setpoint); AI 1 Room Pressure (Room differential pressure); AI 2 Supply Flow Rate (Supply airflow); AI 4 General Exhaust Flow Rate (General exhaust airflow); AI 6 Hood Flow Rate (Fume hood exhaust airflow); AI 8 Temperature (Room temperature); MI 1 Status Index (Alarm state; 1 = normal, 7 = emergency).
How do I enable BMS control of the TSI SureFlow 8681 Adaptive Offset Controller?
Occ/Unocc Mode (BV 1) switches between the occupied and unoccupied flow and temperature setpoints; Emergency Mode (MV 2) works like the EMERGENCY key.
How do I check these points on the real SureFlow 8681 Adaptive Offset Controller?
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 TSI BACnet points lists
- Laboratory room airflow and pressure controller
TSI Laboratory Room Controller (LRC)
TSI LRC modular laboratory room controllers handling up to 6 supplies, 2 general exhausts and 20 fume hoods.
Also known as: LRC, LRC00, LRC00-LPS, LRC00-CMH, TSI LRC, Lab Room Controller - Room pressure controller
TSI PresSura 8631-CRC Clean Room Pressure Controller
TSI PresSura Model 8631-CRC-BAC clean room pressure controllers with the BACnet board.
Also known as: 8631-CRC, 8631-CRC-BAC, PresSura 8631-CRC - Room pressure monitor
TSI PresSura 8631-CRM Clean Room Pressure Monitor
TSI PresSura Model 8631-CRM-BAC clean room pressure monitors with the BACnet board.
Also known as: 8631-CRM, 8631-CRM-BAC, PresSura 8631-CRM - Room pressure controller
TSI PresSura 8631-HC Hospital Room Pressure Controller
TSI PresSura Model 8631-HC hospital isolation room pressure controllers with the BACnet board.
Also known as: 8631-HC, 8631-HC-BAC, PresSura 8631-HC - Room pressure monitor
TSI PresSura 8631-HM Hospital Room Pressure Monitor
TSI PresSura Model 8631-HM hospital isolation room pressure monitors with the BACnet board.
Also known as: 8631-HM, 8631-HM-BAC, PresSura 8631-HM - Room pressure controller
TSI PresSura RPC30 Room Pressure Controller
TSI PresSura RPC30 controllers that hold one room (optionally with an anteroom) at a set pressure by driving exhaust, supply and reheat outputs.
Also known as: RPC30, PresSura RPC30, RPC30 PresSura - Room pressure monitor
TSI PresSura RPM10 Room Pressure Monitor
TSI PresSura RPM10 single-room pressure monitors.
Also known as: RPM10, PresSura RPM10, RPM10 PresSura - Room pressure monitor
TSI PresSura RPM20 Room Pressure Monitor
TSI PresSura RPM20 room pressure monitors for one room, a room with anteroom, or two rooms with an anteroom.
Also known as: RPM20, PresSura RPM20, RPM20 PresSura - Room pressure monitor
TSI PresSura RPM20-CC Room Pressure Monitor (particle counting)
TSI PresSura RPM20-CC room pressure monitors with particle counter channels, for clean rooms.
Also known as: RPM20-CC, PresSura RPM20-CC, RPM20 CC - Room pressure controller
TSI SureFlow 8636 Room Pressure Controller
TSI SureFlow Model 8636-BAC room pressure controllers with the BACnet MS/TP board.
Also known as: 8636, 8636-BAC, SureFlow 8636 - Laboratory room pressure and airflow offset controller
TSI SureFlow 8682 Adaptive Offset Controller
TSI SureFlow Model 8682-BAC adaptive offset controllers (up to 4 supplies, 2 general exhausts and 7 hoods) with the BACnet MS/TP board.
Also known as: 8682, 8682-BAC, SureFlow 8682
Source: SureFlow Adaptive Offset Controller Models 8681/8681-BAC Operation and Service Manual · P/N 1980476 · rev. Revision E, February 2013. Object names, instances and units are reproduced as published; descriptions are our own.