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BACnet instance calculator · VX4 thermostats (Online Connection Kit)

Verdant VX4 BACnet Instance Calculator (Room Numbers)

Free browser tool · nothing is uploaded · 5 November 2026

Verdant VX4 rooms all get the same 15 objects at a base number plus the room number - but the room number is read as hexadecimal. This does the conversion for you.

Short answer

Instance = base + the room number read as hex. Room 101 is hex 0x101 = 257, so its room temperature (base 500000) is AV 500257; room 215 is 0x215 = 533, so its guest setpoint is AV 300533.

Verdant calculator

As set on the thermostat, e.g. 101
or a range of room number to

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 = base + hex-to-decimal(room number)

    PartMeaningRange
    baseFixed base for each object (100000, 200000 ... 1500000)100000-1500000
    roomRoom number, read as a hexadecimal numbere.g. 101 -> 257

    Use the room number exactly as it is set on the thermostat (for example 101 or 2A0) and read it as hex. Verdant's sheet gives no worked example, so confirm one room against a scan before mapping a whole building.

    Worked example: room 101

    The first objects for room 101 on the VX4, worked out with the formula above:

    ObjectName (as printed)What it is
    AV 100257Cool SetpointCooling setpoint of the room; base + room no.
    AV 200257Heat SetpointHeating setpoint of the room; base + room no.
    AV 300257Guest SetpointGuest setpoint of the room, 60-90; base + room no.
    AV 400257Thermostat StatusHeat/cool on, off or in setback; base + room no.
    AV 500257Room TemperatureRoom temperature; base + room no.
    AV 600257Room HumidityRoom relative humidity; base + room no.

    Source

    Formula and objects from VX4 Energy Management Thermostats with BACnet Integration (spec sheet) · VX4-XX-XXX · rev. 2024-10 (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 Verdant instance number?

    Instance = base + the room number read as hex. Room 101 is hex 0x101 = 257, so its room temperature (base 500000) is AV 500257; room 215 is 0x215 = 533, so its guest setpoint is AV 300533.

    Why is room 101 not instance 500101?

    Verdant adds the room number read as hexadecimal. 101 in hex is 1 x 256 + 0 x 16 + 1 = 257, so room 101's room temperature is AV 500257, not 500101.

    Can I write the cool or heat setpoint?

    No. Cool Setpoint and Heat Setpoint are read-only; the writable setpoint is Guest Setpoint (60-90 F).

    Is this Verdant calculator official?

    No. It applies the formula printed in Verdant'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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