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BACnet instance calculator · T3SQ Digital (MCU 2 gateway)
Titus T3SQ MCU 2 BACnet Instance Calculator (Zones)
Free browser tool · nothing is uploaded · 5 November 2026
The MCU 2 lays out each object type in blocks of 60, one instance per diffuser zone. Enter the zone to get every object for it.
Zone instance = block start + zone - 1, with every block 60 long. Zone 17's setpoint is AO 16, its space temperature AV 16 and its supply temperature AV 60 + 16 = AV 76.
Titus calculator
The calculator needs JavaScript. The formula and a worked example are below.
Which unit does this instance belong to?
How the numbers are built
instance = block start + zone - 1
| Part | Meaning | Range |
|---|---|---|
| block start | First instance of that object type's block (0, 60, 120...) | 0-419 |
| zone | MCU 2 zone number | 1-60 |
Zones are set up on the MCU 2; zones that are not set up return no data. Only master-diffuser data is available.
Worked example: zone 17
The first objects for zone 17 on the MCU 2, worked out with the formula above:
| Object | Name (as printed) | What it is |
|---|---|---|
| AV 16 | Space Temp 1 | Zone space temperature, 0-40 °C (zone 1) |
| AV 76 | Supply Temp 1 | Zone supply air temperature, 0-40 °C (zone 1) |
| AV 136 | Control Disk pos 1 | Master diffuser control disk position (zone 1) |
| AV 196 | Heater output 1 | Zone re-heater output (zone 1) |
| AV 256 | Disk Min Pos 1 | Diffuser disk minimum position (zone 1) |
| AV 316 | Disk Max Pos 1 | Diffuser disk maximum position (zone 1) |
Source
Formula and objects from Titus Digital T3SQ MLM Integration with BMS · BW0070-3 · rev. 2015-06 (manufacturer document ↗), re-typed in our points list. Object names are shown as printed.
Check it against the live device. The calculator applies the formula from the manufacturer’s documentation; the gateway in front of you may expose fewer objects or use other numbers after a firmware change. Easy BACnet scans a network for BACnet IP devices from an Android phone and reads every object on them — a quick way to confirm one unit before you map a whole building.
Questions
How do I work out a Titus instance number?
Zone instance = block start + zone - 1, with every block 60 long. Zone 17's setpoint is AO 16, its space temperature AV 16 and its supply temperature AV 60 + 16 = AV 76.
Why does the name end in 1?
Names are shown for zone 1 as printed (Space Temp 1, Setpoint 1); on the MCU the number at the end matches the zone.
Is this Titus calculator official?
No. It applies the formula printed in Titus's own documentation to the points list in our library. Confirm the numbers against a scan of the live device before you map or write anything.
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