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BACnet instance calculator · GMS GW BACnet converter
Gree BACnet Instance Calculator (GMS GW Converter)
Free browser tool · nothing is uploaded · 5 November 2026
Gree's GMS GW 1 and GMS GW 12 converters number every split unit's objects from its line and remote control address. Pick the unit series, enter the address and get the instances.
GMS GW instance = class x 1048576 + (line - 1) x 131072 + remote control address x 256 + object number. Common objects are class 0, series-specific ones class 1. Line 1, address 5 setpoint (object 0) is 5 x 256 + 0 = AV 1280.
Gree 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 = class x 1048576 + (line - 1) x 131072 + address x 256 + object
| Part | Meaning | Range |
|---|---|---|
| class | 0 = common objects, 1 = series-specific objects | 0-1 |
| line | RS-485 line of the converter (the gateway shows units as L<line>.<address>) | 1-2 |
| address | Remote control address set on the unit's wired controller | 0-63 |
| object | Object number inside the unit's block | 0-255 |
Each split unit's remote control address (0-63 per line) is set on its wired controller; the gateway shows it as L1.005 and so on. GMS GW 1 handles one unit, GMS GW 12 up to 12 units on two lines.
Worked example: line 1, address 05 (L1.005)
The first objects for line 1, address 05 (L1.005) on the M / W / P / X series (DWUNI controller), worked out with the formula above (M / W / P / X series (DWUNI controller)):
| Object | Name (as printed) | What it is |
|---|---|---|
| BI 1280 | split unit Failure Status | Unit failure; Active_Text holds the failure code |
| BV 1280 | ON/OFF | Unit on/off |
| BV 1282 | Lock (prohibit) ON/OFF change from Wired Controller | Lock on/off at the wired controller |
| BV 1283 | Lock (prohibit) Operation Mode change from Wired Controller | Lock mode change at the wired controller |
| BV 1285 | Global Lock | Lock all wired-controller changes |
| AI 1280 | Room Temperature | Room temperature |
| BV 1049860 | Health Function | Health function on/off |
| BV 1049861 | I-Demand Function | I-Demand function on/off |
| BV 1049862 | Dry Function | Dry function on/off |
| BV 1049863 | Quiet Mode | Quiet mode on/off |
| BV 1049864 | Memory Function | Memory function on/off |
| BV 1049865 | Wired Controller Temperature Presentation | Wired controller display units |
Source
- Gree GMS BACnet Converter (GMS GW) - M/W/P/X series with DWUNI BACnet points list (23 objects)
- Gree GMS BACnet Converter (GMS GW) - R series BACnet points list (32 objects)
Formula and objects from Gree Mini Split (GMS) BACnet Converter User Manual · 1.1 · rev. 2023-12-11 (Version 1.1) (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 Gree instance number?
GMS GW instance = class x 1048576 + (line - 1) x 131072 + remote control address x 256 + object number. Common objects are class 0, series-specific ones class 1. Line 1, address 5 setpoint (object 0) is 5 x 256 + 0 = AV 1280.
Why are some Gree objects above one million?
Series-specific objects are class 1, which adds 1048576 (2 to the power of 20) to the instance. They differ between DWUNI (M/W/P/X) and R-series units, so pick the right series.
Who makes the Gree GMS GW?
The converter is made by CoolAutomation for Gree, which is why its numbering looks like the CoolMasterNet scheme.
Is this Gree calculator official?
No. It applies the formula printed in Gree'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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