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Room pressure controller · BACnet points list
TSI PresSura 8631-CRC Clean Room Pressure Controller BACnet points list
Updated 6 November 2026
The 8631-CRC controls clean room pressure by modulating supply and exhaust dampers, with a second pressure sensor and two supply flow inputs for monitoring. With the BACnet board it is a BACnet MS/TP device exposing pressures, flows, damper positions, the pressure and supply setpoints, alarm limits, a Status Index alarm code and an emergency mode command.
This page lists 19 BACnet objects for the TSI PresSura 8631-CRC Clean Room Pressure Controller — 10 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
- PresSura 8631-CRC Clean Room Pressure Controller
- Equipment
- Room pressure controller
- Equipment type
- Thermostats, sensors & meters
- BACnet objects
- 19 (10 writable)
- Transport
- BACnet MS/TP
- Firmware
- 1.0 (PICS)
- Default device instance
- 863001
- Also known as
- 8631-CRC, 8631-CRC-BAC, PresSura 8631-CRC
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 PresSura 8631-CRC Clean Room Pressure Controller
Write the room pressure setpoint (AV 2) and supply setpoint (AV 3) if the BMS manages them, and use Emergency Mode (MV 3) for purge. Read room pressure, flows, damper positions 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 |
|---|---|---|---|
| MV 3 | Emergency Mode | 1 = exit, 2 = enter emergency mode, 3 = normal | Write |
| AV 2 | Pressure Setpoint | Room pressure setpoint | Write |
| AV 3 | Supply Setpoint | Supply airflow setpoint | Write |
| AI 1 | Room Pressure | Room differential pressure | Read |
| AI 3 | Supply #1 Flow Rate | Supply 1 airflow | Read |
| AI 6 | Supply Damper Position | Supply damper position, % | Read |
| AI 7 | Exhaust Damper Position | Exhaust damper position, % | Read |
| MI 1 | Status Index | Alarm state; 1 = normal, 8 = emergency | Read |
Enable & remote start
Emergency Mode (MV 3) is the only mode command. Emergency drives the room to maximum negative or positive pressure, the same as the red 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); it only appears on units with the BACnet board.
- The device instance is 863000 plus the MAC address (MAC 1 gives 863001).
Watch out for
- Pressure units change with Units Value (MV 2); in. H2O and Pa only apply when pressure transducers are used.
- The device instance changes if the MAC address is changed.
TSI PresSura 8631-CRC Clean Room Pressure 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 | ||
| AI | 2 | Sec Sens Pressure | Second pressure sensor | ft/min, m/s, in. H2O, Pa | Read | |
| AImin | 3 | Supply #1 Flow Rate | cfm, l/s | Read | ||
| AI | 4 | Supply #2 Flow Rate | cfm, l/s | Read | ||
| AI | 5 | Air Changes Per Hour | Read | |||
| AImin | 6 | Supply Damper Position | % | Read | ||
| AImin | 7 | Exhaust Damper Position | % | Read | ||
| AV | 1 | MAC Address | Range 1 to 127 | Write | ||
| AVmin | 2 | Pressure Setpoint | Range -0.195 to -0.195 in. H2O as printed | ft/min, m/s, in. H2O, Pa | Write | |
| AVmin | 3 | Supply Setpoint | Range 0 to 30,000 cfm | cfm, l/s | Write | |
| AV | 4 | Low Alarm | Range -0.195 to -0.195 in. H2O as printed | ft/min, m/s, in. H2O, Pa | Write | |
| AV | 5 | High Alarm | Range -0.195 to -0.195 in. H2O as printed | ft/min, m/s, in. H2O, Pa | Write | |
| AV | 6 | Sec Low Alarm | Range -0.195 to 0.195 in. H2O | ft/min, m/s, in. H2O, Pa | Write | |
| AV | 7 | Sec High Alarm | Range -0.195 to 0.195 in. H2O | ft/min, m/s, in. H2O, Pa | Write | |
| AV | 8 | Min Supply Alarm | Range 0 to 30,000 cfm | cfm, l/s | Write | |
| MImin | 1 | Status Index | Read | 1=Normal, 2=Low Alarm, 3=High Alarm, 4=Min Supply Alarm, 5=Sec Sens Low Alarm, 6=Sec Sens High Alarm, 7=Data Error, 8=Emergency | ||
| MV | 2 | Units Value | Write | 1=ft/min, 2=m/s, 3="H2O, 4=Pa | ||
| MVmin | 3 | Emergency Mode | Write | 1=Exit Emergency Mode, 2=Enter Emergency Mode, 3=Normal | ||
| DEV | 863001 | TSI8631-CRC | Device object; instance = 863000 + MAC address | Read |
No points match these filters.
Object ID lookup: TSI PresSura 8631-CRC Clean Room Pressure Controller point IDs by name
AI1Room PressureAI2Sec Sens PressureAI3Supply #1 Flow RateAI4Supply #2 Flow RateAI5Air Changes Per HourAI6Supply Damper PositionAI7Exhaust Damper PositionAV1MAC AddressAV2Pressure SetpointAV3Supply SetpointAV4Low AlarmAV5High AlarmAV6Sec Low AlarmAV7Sec High AlarmAV8Min Supply AlarmMI1Status IndexMV2Units ValueMV3Emergency Mode
Integration notes
- From the Model 8631-CRC BACnet MS/TP Object Set table (manual page 56).
- 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 2): 1 = ft/min, 2 = m/s, 3 = in. H2O, 4 = Pa. Flow is cfm in English mode and l/s in metric mode.
- The ranges for Pressure Setpoint, Low Alarm and High Alarm are printed as "-0.195000 to -0.19500" and are kept as printed.
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 PresSura 8631-CRC Clean Room Pressure 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 PresSura 8631-CRC Clean Room Pressure Controller
How many BACnet points does the TSI PresSura 8631-CRC Clean Room Pressure Controller have?
This list has 19 BACnet objects: 7 analog inputs, 8 analog values, 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 PresSura 8631-CRC Clean Room Pressure Controller BACnet points are writable?
10 of the 19 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 PresSura 8631-CRC Clean Room Pressure Controller BACnet documentation?
The source is PresSura Clean Room Pressure Monitor/Controller with LON/BACnet, Models 8631-CRM/8631-CRM-BAC/8631-CRC/8631-CRC-BAC Operation and Service Manual (P/N 1980489), revision Revision F, published free by TSI at https://tsi.com/getmedia/44b7bb16-9f83-4176-b2f6-a3610aa87c8c/1980489-8631CRx-Pressura-web?ext=.pdf.
What are the minimum BACnet points to integrate the TSI PresSura 8631-CRC Clean Room Pressure Controller?
Start with MV 3 Emergency Mode (1 = exit, 2 = enter emergency mode, 3 = normal); AV 2 Pressure Setpoint (Room pressure setpoint); AV 3 Supply Setpoint (Supply airflow setpoint); AI 1 Room Pressure (Room differential pressure); AI 3 Supply #1 Flow Rate (Supply 1 airflow); AI 6 Supply Damper Position (Supply damper position, %); AI 7 Exhaust Damper Position (Exhaust damper position, %); MI 1 Status Index (Alarm state; 1 = normal, 8 = emergency).
How do I enable BMS control of the TSI PresSura 8631-CRC Clean Room Pressure Controller?
Emergency Mode (MV 3) is the only mode command. Emergency drives the room to maximum negative or positive pressure, the same as the red EMERGENCY key.
How do I check these points on the real PresSura 8631-CRC Clean Room Pressure 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 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 8681 Adaptive Offset Controller
TSI SureFlow Model 8681-BAC adaptive offset (lab room) controllers with the BACnet MS/TP board.
Also known as: 8681, 8681-BAC, SureFlow 8681 - 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: PresSura Clean Room Pressure Monitor/Controller with LON/BACnet, Models 8631-CRM/8631-CRM-BAC/8631-CRC/8631-CRC-BAC Operation and Service Manual · P/N 1980489 · rev. Revision F. Object names, instances and units are reproduced as published; descriptions are our own.