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BACnet instance calculator · UTY-VBGX VRF gateway
Fujitsu BACnet Instance Calculator (UTY-VBGX VRF)
Free browser tool · nothing is uploaded · 5 November 2026
Fujitsu's UTY-VBGX gateway puts the refrigerant system and unit address inside every instance number. Enter the addresses and get the full object list for that unit, or paste an instance to see which unit it belongs to.
On a Fujitsu UTY-VBGX every indoor unit object is a 6-digit number TT rr uu: a 2-digit point code (10-17), the refrigerant system address (00-99) and the indoor unit address (00-63). Outdoor unit objects use point codes 30-33 with the outdoor unit address (0-3) at the end. So the setpoint command for refrigerant system 2, indoor unit 5 is AO 100205.
Fujitsu 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 = point code x 10000 + refrigerant system x 100 + unit address
| Part | Meaning | Range |
|---|---|---|
| TT | Point code: which object of the unit (10-17 indoor, 30-33 outdoor) | 10-17, 30-33 |
| rr | Refrigerant system address | 00-99 |
| uu | Indoor unit address (outdoor unit address for OU objects) | 00-63 (OU 0-3) |
The addresses are the ones the Fujitsu configuration tool shows for each unit after it scans the VRF network. Gateway-wide and batch objects (all units at once) sit at fixed low instances 0-2.
Worked example: refrigerant system 02, indoor unit 05
The first objects for refrigerant system 02, indoor unit 05 on the UTY-VBGX, worked out with the formula above:
| Object | Name (as printed) | What it is |
|---|---|---|
| AI 100205 | IU_rr_uu_SetTemp_Status | Current setpoint |
| AI 110205 | IU_rr_uu_SpaceTemp_Status | Room temperature |
| AI 120205 | IU_rr_uu_AutoTempLoLim_Status | Auto mode setpoint low limit |
| AI 130205 | IU_rr_uu_AutoTempHiLim_Status | Auto mode setpoint high limit |
| AI 140205 | IU_rr_uu_CoolTempLoLim_Status | Cool mode setpoint low limit |
| AI 150205 | IU_rr_uu_CoolTempHiLim_Status | Cool mode setpoint high limit |
| BI 300200 | OU_rr_uu_Error_Status | Outdoor unit fault |
| BI 310200 | OU_rr_uu_ForcedOff_Status | Forced-off status |
| BO 310200 | OU_rr_uu_ForcedOff_Setting | Forced-off command |
| MI 300200 | OU_rr_uu_ErrorCode_Status | Outdoor unit error code (1-255) |
| MI 310200 | OU_rr_uu_CapacitySave_Status | Capacity saving level |
| MI 320200 | OU_rr_uu_LowNoiseOp_Status | Low noise operation status |
Source
Formula and objects from BACnet Gateway for VRF System UTY-VBGX Instruction Manual (PICS & User Manual) · rev. r1.3.2 (2017) (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 Fujitsu instance number?
On a Fujitsu UTY-VBGX every indoor unit object is a 6-digit number TT rr uu: a 2-digit point code (10-17), the refrigerant system address (00-99) and the indoor unit address (00-63). Outdoor unit objects use point codes 30-33 with the outdoor unit address (0-3) at the end. So the setpoint command for refrigerant system 2, indoor unit 5 is AO 100205.
Why does my Fujitsu indoor unit setpoint read AO 100101?
100101 is point code 10 (setpoint), refrigerant system 01, indoor unit 01. Every other indoor unit uses the same point codes with its own system and unit address in the last four digits.
What is the device instance of the UTY-VBGX?
It is set in the Fujitsu configuration tool. The object table shows 144000 and the configuration section says 144; give each gateway its own value. The calculator only changes the object instances.
Is this Fujitsu calculator official?
No. It applies the formula printed in Fujitsu'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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