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Fan coil thermostat · BACnet points list
Schneider Electric SpaceLogic TC900 Protocol Series fan coil thermostat (TC903 / TC907) BACnet points list
Updated 12 November 2026
The TC900 Protocol Series are wall thermostats for 2-pipe and 4-pipe fan coils that talk BACnet MS/TP or Modbus RTU on one RS-485 port. Over BACnet MS/TP the BMS can switch the thermostat on and off, set the mode, fan speed, setpoints and occupancy override, and read room temperature, valve outputs, fan speed and sensor faults. A room temperature can also be written from the BMS.
This page lists 61 BACnet objects for the Schneider Electric SpaceLogic TC900 Protocol Series fan coil thermostat (TC903 / TC907) — 48 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Schneider Electric’s own free documentation, linked below.
- Manufacturer
- Schneider Electric
- Model
- SpaceLogic TC900 Protocol Series fan coil thermostat (TC903 / TC907)
- Equipment
- Fan coil thermostat
- Equipment type
- VAV boxes & fan coils
- BACnet objects
- 61 (48 writable)
- Transport
- BACnet MS/TP
- Firmware
- Not stated
- Also known as
- TC900, TC903, TC907, TC903-EF4LDPSA, TC903-EF4PDPSA, TC903-3A4LXPXA, TC903-3A4LDPSA, TC903-3A4PDPSA, TC907-EF4LDPSAB, TC907-EF4PDPSAB, TC907-3A4LDPSAB, TC907-3A4PDPSAB, F-28335
Reference only, provided as-is: verify against Schneider Electric’s current documentation and the live device before use. Not official Schneider Electric information. Terms of use.
BMS integration notes: Schneider Electric SpaceLogic TC900 Protocol Series fan coil thermostat (TC903 / TC907)
Select BACnet as the protocol, set the MS/TP address and baud at the thermostat, then use BO 0 for on/off, MO 0 for mode, MO 1 for fan speed and AO 0 for the setpoint. Read AI 2 room temperature, the fan speed and valve status BIs, and BI 5/BI 6 for sensor 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 0 | Thermostat on or off | Thermostat on/off | Write |
| MO 0 | Operation mode | Mode: 1 cool, 2 heat, 3 vent, 4 auto | Write |
| MO 1 | Fan mode | Fan speed: 1 high, 2 med, 3 low, 4 auto | Write |
| MO 7 | Occupancy override | Occupancy override: 2 occ, 3 unocc | Write |
| AO 0 | Set-point | Room setpoint | Write |
| AI 2 | Actual room temperature | Room temperature | Read |
| BI 7 | Occupancy status | Occupied / unoccupied state | Read |
| BI 0 | Cooling valve (4-pipe) | Cooling valve output state | Read |
| BI 4 | Heating valve (4-pipe) | Heating valve output state | Read |
| BI 5 | Temp sensor, short circuit | Temperature sensor short-circuit fault | Read |
Enable & remote start
BACnet and Modbus share the RS-485 port; BACnet must be selected (parameter setting or BO 8 = 0).
Sensors & values from the BMS
Set BO 12 = 1 (BACnet input) and write the room temperature to AO 14 Temp. input; otherwise the thermostat uses its own or the external sensor chosen in BO 7.
Network setup
- MS/TP master, baud 9600, 19200, 38400 or 76800 (38400 recommended).
- MAC address 0-127, set at the thermostat (menu items 13, 15, 16) or AO 23.
- Device instance 0-4,194,302 is writable.
- Wiring on terminals A (+) and B (-); the RS-485 port is not isolated.
Watch out for
- Changing BO 8 to Modbus drops BACnet communication.
- Don't change the baud rate while the network is running.
- Temperature values switch between °C and °F with BO 14; set the BMS units to match.
- A Cold Start clears all settings to factory defaults.
Schneider Electric SpaceLogic TC900 Protocol Series fan coil thermostat (TC903 / TC907) 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 | |||||
|---|---|---|---|---|---|---|
| AI | 0 | Heating valve 2, output voltage | Heating valve output, 0-10 V | V | Read | |
| AI | 1 | Cooling valve 1, output voltage | Cooling valve output, 0-10 V | V | Read | |
| AImin | 2 | Actual room temperature | Room temperature (0-50 °C / 32-122 °F) | °C or °F | Read | |
| AOmin | 0 | Set-point | Room setpoint (5-35 °C / 41-95 °F) | °C or °F | Write | |
| AO | 1 | Heating set-point, upper limit | Highest heating setpoint allowed | °C or °F | Write | |
| AO | 2 | Cooling set-point, lower limit | Lowest cooling setpoint allowed | °C or °F | Write | |
| AO | 3 | ECO mode, cooling set-point | Cooling setpoint in ECO mode | °C or °F | Write | |
| AO | 4 | ECO mode, heating set-point | Heating setpoint in ECO mode | °C or °F | Write | |
| AO | 5 | Temperature compensation | Room temperature offset (-5 to 5 K / -9 to 9 °F) | K or °F (delta) | Write | |
| AO | 6 | Setpoint, upper limit | Setpoint range upper limit | °C or °F | Write | |
| AO | 7 | Setpoint, lower limit | Setpoint range lower limit | °C or °F | Write | |
| AO | 8 | Differential | Control differential | K or °F (delta) | Write | |
| AO | 9 | ECO mode differential | Control differential in ECO mode | K or °F (delta) | Write | |
| AO | 10 | Auto deadband | Deadband in auto changeover | K or °F (delta) | Write | |
| AO | 11 | Modbus address setting | Modbus address, 1-64 | Write | ||
| AO | 12 | Unoccupied mode, cooling setpoint | Cooling setpoint when unoccupied | °C or °F | Write | |
| AO | 13 | Unoccupied mode, heating setpoint | Heating setpoint when unoccupied | °C or °F | Write | |
| AO | 14 | Temp. input | Room temperature written from the BMS (BO 12 = 1) | °C or °F | Write | |
| AO | 15 | Heating mode KP | Heating proportional gain, 1-99 | Write | ||
| AO | 16 | Cooling mode KP | Cooling proportional gain, 1-99 | Write | ||
| AO | 17 | PID sampling time | PID sample time, 1-99 | s | Write | |
| AO | 18 | KI | Integral gain, 0-99 | Write | ||
| AO | 19 | Span | Control span, 1-99 | Write | ||
| AO | 20 | Low-speed fan output voltage | EC fan low-speed voltage | V | Write | |
| AO | 21 | Medium-speed fan output voltage | EC fan medium-speed voltage | V | Write | |
| AO | 22 | High-speed fan output voltage | EC fan high-speed voltage | V | Write | |
| AO | 23 | BACnet address setting | MS/TP MAC address, 0-127 | Write | ||
| AO | 24 | Backlight brightness (TC907 only) | Backlight level, 0-5 | % | Write | |
| MI | 0 | Thermostat mode | Thermostat state | Read | 1=OFF, 2=ON, 3=Frost protection | |
| MOmin | 0 | Operation mode | Heat/cool mode command | Write | 1=Cool, 2=Heat, 3=Ventilation, 4=Auto | |
| MOmin | 1 | Fan mode | Fan speed command | Write | 1=High, 2=Medium, 3=Low, 4=Auto | |
| MO | 2 | Power-on state | Behaviour after power returns | Write | 1=Power-down memory, 2=No power-down memory, 3=Display on when powered | |
| MO | 3 | Operation mode configuration | Allowed modes / pipe configuration | Write | 1=Heat only (heat + vent), 2=Cool only (cool + vent), 3=Heat and cool (heat + cool + vent), 4=Auto, 5=2-pipe mode | |
| MO | 4 | Baud rate | RS-485 baud rate | Write | 1=76800, 2=9600, 3=19200, 4=38400 | |
| MO | 5 | Modbus parity check | Modbus parity | Write | 1=Odd check, 2=Even check, 3=None | |
| MO | 6 | Unoccupied mode, fan speed | Fan speed when unoccupied | Write | 1=High, 2=Medium, 3=Low | |
| MOmin | 7 | Occupancy override | Occupancy override command | Write | 1=No, 2=Occupied, 3=Unoccupied | |
| BImin | 0 | Cooling valve (4-pipe) | Cooling valve output state | Read | 0=OFF, 1=ON | |
| BI | 1 | Fan speed status high | Fan running at high speed | Read | 0=OFF, 1=ON | |
| BI | 2 | Fan speed status medium | Fan running at medium speed | Read | 0=OFF, 1=ON | |
| BI | 3 | Fan speed status low | Fan running at low speed | Read | 0=OFF, 1=ON | |
| BImin | 4 | Heating valve (4-pipe) | Heating valve output state | Read | 0=OFF, 1=ON | |
| BImin | 5 | Temp sensor, short circuit | Temperature sensor shorted | Read | 0=OK, 1=Fault | |
| BI | 6 | Temp sensor, open circuit | Temperature sensor open | Read | 0=OK, 1=Fault | |
| BImin | 7 | Occupancy status | Occupancy state | Read | 0=Unoccupied, 1=Occupied | |
| BI | 8 | Keycard status | Hotel keycard present | Read | 0=Not present, 1=Present | |
| BOmin | 0 | Thermostat on or off | Thermostat on/off command | Write | 0=OFF, 1=ON | |
| BO | 1 | ECO mode | ECO mode enable | Write | 0=Disabled, 1=Enabled | |
| BO | 2 | Sleep mode | Sleep mode enable | Write | 0=Disabled, 1=Enabled | |
| BO | 3 | Low temperature protection | Frost protection enable | Write | 0=Disabled, 1=Enabled | |
| BO | 4 | Fan operation after setting temperature is reached | Fan keeps running at setpoint | Write | 0=Fan OFF, 1=Fan ON | |
| BO | 5 | Auto fan | Auto fan speed allowed | Write | 0=Disabled, 1=Enabled | |
| BO | 6 | Display temperature | Value shown on the display | Write | 0=Room temp, 1=Set-point | |
| BO | 7 | Temperature sensor | Built-in or external sensor | Write | 0=Built-in sensor, 1=External sensor | |
| BO | 8 | Communication protocol selection | BACnet or Modbus on RS-485 | Write | 0=BACnet, 1=Modbus | |
| BO | 9 | RTC clock display | Show the clock | Write | 0=Disable, 1=Enable | |
| BO | 10 | 12 or 24-hour clock | Clock format | Write | 0=12-hour clock, 1=24-hour clock | |
| BO | 11 | Occupancy or auxiliary input closed or open | Occupancy input logic | Write | 0=Occupied if closed, unoccupied if open, 1=Unoccupied if closed, occupied if open | |
| BO | 12 | Temp. value from connection | Room temperature source | Write | 0=Local device, 1=BACnet input | |
| BO | 13 | Keypad status | Keypad lock | Write | 0=Unlocked, 1=Locked | |
| BO | 14 | F or C degree | Temperature unit | Write | 0=°F, 1=°C |
No points match these filters.
Object ID lookup: Schneider Electric SpaceLogic TC900 Protocol Series fan coil thermostat point IDs by name
AI0Heating valve 2, output voltageAI1Cooling valve 1, output voltageAI2Actual room temperatureAO0Set-pointAO1Heating set-point, upper limitAO2Cooling set-point, lower limitAO3ECO mode, cooling set-pointAO4ECO mode, heating set-pointAO5Temperature compensationAO6Setpoint, upper limitAO7Setpoint, lower limitAO8DifferentialAO9ECO mode differentialAO10Auto deadbandAO11Modbus address settingAO12Unoccupied mode, cooling setpointAO13Unoccupied mode, heating setpointAO14Temp. inputAO15Heating mode KPAO16Cooling mode KPAO17PID sampling timeAO18KIAO19SpanAO20Low-speed fan output voltageAO21Medium-speed fan output voltageAO22High-speed fan output voltageAO23BACnet address settingAO24Backlight brightness (TC907 only)MI0Thermostat modeMO0Operation modeMO1Fan modeMO2Power-on stateMO3Operation mode configurationMO4Baud rateMO5Modbus parity checkMO6Unoccupied mode, fan speedMO7Occupancy overrideBI0Cooling valve (4-pipe)BI1Fan speed status highBI2Fan speed status mediumBI3Fan speed status lowBI4Heating valve (4-pipe)BI5Temp sensor, short circuitBI6Temp sensor, open circuitBI7Occupancy statusBI8Keycard statusBO0Thermostat on or offBO1ECO modeBO2Sleep modeBO3Low temperature protectionBO4Fan operation after setting temperature is reachedBO5Auto fanBO6Display temperatureBO7Temperature sensorBO8Communication protocol selectionBO9RTC clock displayBO1012 or 24-hour clockBO11Occupancy or auxiliary input closed or openBO12Temp. value from connectionBO13Keypad statusBO14F or C degree
Integration notes
- Temperature objects follow the unit chosen in BO 14: values are sent in °C or °F.
- AO 20-22 apply to EC fan models; AO 24 is TC907 only. Objects for features a model lacks can be ignored.
- The guide marks AO, BO and MSO Present_Value as writable; AI, BI and MSI are read-only.
- Setpoint ranges are bounded by AO 1, AO 2, AO 6, AO 7 and the operation mode; MO 3 limits the modes MO 0 can select.
- A Warm Start restarts the thermostat; a Cold Start resets it to factory settings.
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 SpaceLogic TC900 Protocol Series fan coil thermostat (TC903 / TC907) 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 Schneider Electric SpaceLogic TC900 Protocol Series fan coil thermostat (TC903 / TC907)
How many BACnet points does the Schneider Electric SpaceLogic TC900 Protocol Series fan coil thermostat (TC903 / TC907) have?
This list has 61 BACnet objects: 3 analog inputs, 25 analog outputs, 9 binary inputs, 15 binary outputs, 1 multi-state input, 8 multi-state outputs. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Schneider Electric SpaceLogic TC900 Protocol Series fan coil thermostat (TC903 / TC907) BACnet points are writable?
48 of the 61 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 Schneider Electric SpaceLogic TC900 Protocol Series fan coil thermostat (TC903 / TC907) BACnet documentation?
The source is SpaceLogic Thermostat TC900 Protocol Series for Fan Coil Applications User Guide (F-28335-2), revision 11/2025, published free by Schneider Electric at https://download.se.com/files?p_Doc_Ref=F-28335.
What are the minimum BACnet points to integrate the Schneider Electric SpaceLogic TC900 Protocol Series fan coil thermostat (TC903 / TC907)?
Start with BO 0 Thermostat on or off (Thermostat on/off); MO 0 Operation mode (Mode: 1 cool, 2 heat, 3 vent, 4 auto); MO 1 Fan mode (Fan speed: 1 high, 2 med, 3 low, 4 auto); MO 7 Occupancy override (Occupancy override: 2 occ, 3 unocc); AO 0 Set-point (Room setpoint); AI 2 Actual room temperature (Room temperature); BI 7 Occupancy status (Occupied / unoccupied state); BI 0 Cooling valve (4-pipe) (Cooling valve output state); BI 4 Heating valve (4-pipe) (Heating valve output state); BI 5 Temp sensor, short circuit (Temperature sensor short-circuit fault).
How do I enable BMS control of the Schneider Electric SpaceLogic TC900 Protocol Series fan coil thermostat (TC903 / TC907)?
BACnet and Modbus share the RS-485 port; BACnet must be selected (parameter setting or BO 8 = 0).
Can the BMS supply sensor values to the Schneider Electric SpaceLogic TC900 Protocol Series fan coil thermostat (TC903 / TC907)?
Set BO 12 = 1 (BACnet input) and write the room temperature to AO 14 Temp. input; otherwise the thermostat uses its own or the external sensor chosen in BO 7.
How do I check these points on the real SpaceLogic TC900 Protocol Series fan coil thermostat (TC903 / TC907)?
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.
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Source: SpaceLogic Thermostat TC900 Protocol Series for Fan Coil Applications User Guide · F-28335-2 · rev. 11/2025. Object names, instances and units are reproduced as published; descriptions are our own.