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TA640FC-BAC touch-screen thermostat (BACnet MS/TP)

Fan coil thermostat (24 VAC) · BACnet points list

Avantec TA640FC-BAC touch-screen thermostat (BACnet MS/TP) BACnet points list

Updated 4 November 2026

Short answer

The TA640FC-BAC is a 24 VAC fan coil thermostat with BACnet MS/TP. Most values are read-only Analog Inputs (room and external temperature, mode, fan mode and status, PI outputs, spans); the BMS can write the room setpoint, the PI bands and 0-10 V offset, forced ventilation and the screen saver.

This page lists 20 BACnet objects for the Avantec TA640FC-BAC touch-screen thermostat (BACnet MS/TP) — 7 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Avantec’s own free documentation, linked below.

Manufacturer: Avantec
Model: TA640FC-BAC touch-screen thermostat (BACnet MS/TP)
Equipment: Fan coil thermostat (24 VAC)
Equipment type: VAV boxes & fan coils
BACnet objects: 20 (7 writable)
Transport: BACnet MS/TP
Firmware: v137
Also known as: TA640FC-BAC, TA640FC BACnet, Avantec TA640 BACnet, TA640FC
Source document: Functional Specification of TA640FC-BAC · TA640FC-BAC-2022.11.4 · rev. 2022-11-04

Download CSV 20 rows Download EDE B.I.G.-EU JSON Manufacturer PDF ↗ Compare with your scan Download Easy BACnet Mobile App Google Play

Reference only, provided as-is: verify against Avantec’s current documentation and the live device before use. Not official Avantec information. Terms of use.

BMS integration notes: Avantec TA640FC-BAC touch-screen thermostat (BACnet MS/TP)

Integration in brief

Give the thermostat a unique device instance, write the room setpoint (AV 3) and read room temperature (AI 0), mode (AI 1), fan status (AI 3) and the PI outputs. The on/off object BV 2 is marked reserved, so on/off and mode are not controlled over BACnet.

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
AV 3	Room Temp setpoint	Room setpoint, 10-35 °C	Write
AI 0	Room Temperature	Room temperature, °C	Read
AI 1	Heat/Cool Mode	0 Heat, 1 Cool	Read
AI 2	Fan Mode	0 Auto, 1 Low, 2 Mid, 3 High	Read
AI 3	Fan Status	Running fan speed, 0 = off	Read
AI 6	PI Cool Output %	Cooling output, %	Read

Network setup

BACnet MS/TP; device ID range 0-3FFFF (hex).

Watch out for

Reserved (*) objects AI 10, AI 11, BI 0 and BV 2 have no effect; do not map them as controls.

Avantec TA640FC-BAC touch-screen thermostat (BACnet MS/TP) 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.

20 of 20 shown

Type

Access

Units

Show

Avantec TA640FC-BAC touch-screen thermostat (BACnet MS/TP) BACnet Points List
			Description			States
AImin	0	Room Temperature	Room temperature, 5.0-40.0	°C	Read
AImin	1	Heat/Cool Mode	Present mode		Read	0=Heat, 1=Cool
AImin	2	Fan Mode	Selected fan mode		Read	0=Auto, 1=Low, 2=Mid, 3=High
AImin	3	Fan Status	Running fan speed		Read	0=Off, 1=Low, 2=Mid, 3=High
AI	4	External Sensor Temp	External sensor temperature, 5.0-40.0	°C	Read
AI	5	PI Heat Output %	PI heating output, 0-100	%	Read
AImin	6	PI Cool Output %	PI cooling output, 0-100	%	Read
AI	7	Room Temp Offset	Room sensor offset, -5 to +5	°C	Read
AI	8	Cool mode span	Cooling span, 2-4	°C	Read
AI	9	Heat mode span	Heating span, 2-4	°C	Read
AI	10	Cool mode setpoint(*)	Reserved; no effect on operation	°C	Read
AI	11	Heat mode setpoint(*)	Reserved; no effect on operation	°C	Read
AV	0	P.I. Cool mode P-Band	Cooling proportional band, 0.5-8 (default 2)	°C	Write
AV	1	P.I. Heat mode P-Band	Heating proportional band, 0.5-8 (default 2)	°C	Write
AV	2	P.I. 0~10V output offset	0-10 V output offset, 30-70 steps (default 50)		Write
AVmin	3	Room Temp setpoint	Room setpoint, 10-35	°C	Write
BI	0	Occupancy mode status(*)	Reserved; no effect on operation		Read	On / Off
BV	0	Forced Ventilation	Forced ventilation		Write	Enable / Disable
BV	1	User Interface Screen Saver	Display screen saver		Write	Standard / Off
BV	2	System On/Off mode(*)	Reserved; no effect on operation		Write	On / Off

Object ID lookup: Avantec TA640FC-BAC touch-screen thermostat point IDs by name

AI0Room Temperature
AI1Heat/Cool Mode
AI2Fan Mode
AI3Fan Status
AI4External Sensor Temp
AI5PI Heat Output %
AI6PI Cool Output %
AI7Room Temp Offset
AI8Cool mode span
AI9Heat mode span
AI10Cool mode setpoint(*)
AI11Heat mode setpoint(*)
AV0P.I. Cool mode P-Band
AV1P.I. Heat mode P-Band
AV2P.I. 0~10V output offset
AV3Room Temp setpoint
BI0Occupancy mode status(*)
BV0Forced Ventilation
BV1User Interface Screen Saver
BV2System On/Off mode(*)

Integration notes

Objects marked (*) are reserved: their values have no effect on operation (AI 10, AI 11, BI 0, BV 2).
Mode, fan mode and fan status are reported as Analog Inputs with coded values, not multistate objects.
Binary state texts are printed without numbers (On / Off, Enable / Disable, Standard / Off).
Source: Avantec functional specification of TA640FC-BAC, 4 November 2022.

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 TA640FC-BAC touch-screen thermostat (BACnet MS/TP) 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 Avantec TA640FC-BAC touch-screen thermostat (BACnet MS/TP)

How many BACnet points does the Avantec TA640FC-BAC touch-screen thermostat (BACnet MS/TP) have?

This list has 20 BACnet objects: 12 analog inputs, 4 analog values, 1 binary input, 3 binary values. The exact set on a given unit depends on its firmware, installed options and configuration.

Which Avantec TA640FC-BAC touch-screen thermostat (BACnet MS/TP) BACnet points are writable?

7 of the 20 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 Avantec TA640FC-BAC touch-screen thermostat (BACnet MS/TP) BACnet documentation?

The source is Functional Specification of TA640FC-BAC (TA640FC-BAC-2022.11.4), revision 2022-11-04, published free by Avantec at https://avantec-thingsboard.readthedocs.io/en/latest/_downloads/a3cb1fa3de0f1bf3380cd7ab06b7890c/TA640FC-BAC-2022.11.4.pdf.

What are the minimum BACnet points to integrate the Avantec TA640FC-BAC touch-screen thermostat (BACnet MS/TP)?

Start with AV 3 Room Temp setpoint (Room setpoint, 10-35 °C); AI 0 Room Temperature (Room temperature, °C); AI 1 Heat/Cool Mode (0 Heat, 1 Cool); AI 2 Fan Mode (0 Auto, 1 Low, 2 Mid, 3 High); AI 3 Fan Status (Running fan speed, 0 = off); AI 6 PI Cool Output % (Cooling output, %).

How do I check these points on the real TA640FC-BAC touch-screen thermostat (BACnet MS/TP)?

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 Avantec BACnet points lists

Fan coil thermostat (230 VAC, 4-pipe)
Avantec TA692FC-BAC fan coil thermostat (BACnet MS/TP)
Avantec TA692FC-BAC wall thermostat for 4-pipe fan coil units with 3-speed fans and on/off heating and cooling valves.
20 objects · 13 writable · TA692FC-BAC-20230504a
Also known as: TA692FC-BAC, TA692FC BACnet, Avantec fan coil thermostat BACnet, TA692FC

Source: Functional Specification of TA640FC-BAC · TA640FC-BAC-2022.11.4 · rev. 2022-11-04. Object names, instances and units are reproduced as published; descriptions are our own.