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BACnet instance calculator · BDB-CDB (ProtoNode)

Hamilton Engineering BDB-CDB BACnet Instance Calculator (BCB1-8)

Free browser tool · nothing is uploaded · 5 November 2026

The Hamilton BDB-CDB profile repeats a 9-object block for each BCB board. Enter the BCB number to get its instances.

Short answer

BCB n's objects are the BCB1 instance + 9 x (n - 1). BCB1 starts at AI 28, so BCB3's working status (BCB1 AI 31) is 31 + 18 = AI 49 and BCB8 runs AI/MI 91-99.

Hamilton Engineering calculator

1-8
or a range of bcb 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 = BCB1 instance + 9 x (BCB - 1)

    PartMeaningRange
    BCBBCB block number1-8
    BCB1 instancePrinted instance for BCB128-36

    The cascade objects (setpoints, cascade sensors, anomaly) are fixed. The whole BDB-CDB is one BACnet device on the ProtoNode, 50032 by default.

    Worked example: BCB3

    The first objects for BCB3 on the BDB-CDB, worked out with the formula above:

    ObjectName (as printed)What it is
    AI 46BCB1 Temp Sensors StateBCB1 sensor status
    AI 47BCB1 T1 Temp Sensor ValueBCB1 sensor T1 temperature
    AI 48BCB1 T2 Temp Sensor ValueBCB1 sensor T2 temperature
    AI 49BCB1 Working StatusBCB1 working status
    AI 50BCB1 Anom Code 1BCB1 anomaly code 1
    MI 51BCB1 Anom Code 2 PrefixBCB1 anomaly code 2, prefix

    Source

    Formula and objects from ProtoNode FPC-N54 Start-up Guide for Interfacing Hamilton Engineering Products: BDB-CDB · Document Revision 2.A (Web Configurator Template Revision 3) · rev. 2019-06 (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 Hamilton Engineering instance number?

    BCB n's objects are the BCB1 instance + 9 x (n - 1). BCB1 starts at AI 28, so BCB3's working status (BCB1 AI 31) is 31 + 18 = AI 49 and BCB8 runs AI/MI 91-99.

    What is the BDB-CDB's device instance?

    Node_Offset (default 50000) + Node-ID 32 = 50032. The ProtoNode calculator covers that part.

    Is this Hamilton Engineering calculator official?

    No. It applies the formula printed in Hamilton Engineering'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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