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BACnet instance calculator · Open controllers (RTU Open, WSHP Open, UPC Open...)

Carrier Open Controller BACnet Device Instance Calculator

Free browser tool · nothing is uploaded · 5 November 2026

Carrier's Open controllers ship with a default device instance built from 16101 and the two-digit rotary switch (MAC) address. Enter the address to get it.

Short answer

Default device instance = 16101 followed by the 2-digit rotary address, i.e. 1610100 + address. Address 23 gives 1610123; address 5 gives 1610105. The object instances inside are the same on every controller of that type.

Carrier calculator

0-99
or a range of rotary switch address to

The calculator needs JavaScript. The formula and a worked example are below.

Which unit is this device?

    How the numbers are built

    device instance = 1610100 + rotary address

    PartMeaningRange
    16101Fixed prefix in Carrier's default (16 is Carrier's BACnet vendor ID)16101
    addressRotary switch (MS/TP MAC) address, two digits00-99

    The address is set on the controller's two rotary switches (tens and ones). This is the factory default; if the device instance was changed in the controller's setup, read it from a scan.

    Worked example: rotary address 23

    The first objects for rotary address 23 on the RTU Open v5, worked out with the formula above (RTU Open v5):

    Unit typeDevice instanceFor
    Controller device1610123Rotary switch address 23

    Source

    Formula and objects from RTU Open v5 Integration Guide (Appendix A: Network Points List) · 11-808-697-01 · rev. 2019-11-19 (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 Carrier instance number?

    Default device instance = 16101 followed by the 2-digit rotary address, i.e. 1610100 + address. Address 23 gives 1610123; address 5 gives 1610105. The object instances inside are the same on every controller of that type.

    Why is my Carrier controller's device instance 16101xx?

    Carrier's default joins 16101 and the two-digit rotary address, so address 20 shows up as device 1610120. Change the rotary address and the default device instance changes with it.

    Is this Carrier calculator official?

    No. It applies the formula printed in Carrier'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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