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BACnet instance calculator · ACP BACnet / AC Smart BACnet
LG BACnet Instance Calculator (ACP / AC Smart VRF)
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LG's BACnet gateways build every object number from the product type, the unit address and the point number. Enter the address as LG shows it (for example 1A) and get that unit's objects.
On LG's ACP BACnet and AC Smart BACnet, instance = product type x 65536 + unit address x 256 + point, and the address is read as hex. Indoor units are type 0, so unit 1A (= 26) has on/off BO 6657, mode MO 6663, fan speed MO 6667 and setpoint AV 6669. Ventilation units add 65536, outdoor units 196608.
LG 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 = product type x 65536 + hex address x 256 + point
| Part | Meaning | Range |
|---|---|---|
| product type | 0 indoor unit, 1 ventilation (ERV), 2 AHU, 3 outdoor unit, 4 AWHP, 5 general | 0-5 |
| address | LG unit address, read as hex (1A = 26) | 00-FF |
| point | Point number from LG's table | 1-49 |
Use the unit address set on the indoor unit or shown by the ACP / AC Smart (for example 1A or 2F). LG's AC Smart 5 and older BNU-BAC gateways print the same formula and the same point numbers for the points they share. Each product type sits in its own BACnet device: Device ID (default 9000) for indoor units, +1 ERV, +3 outdoor unit data.
Worked example: indoor unit 1A
The first objects for indoor unit 1A on the ACP BACnet, worked out with the formula above:
| Object | Name (as printed) | What it is |
|---|---|---|
| BO 6657 | StartStopCommand_XXX | [Indoor unit] On/off command |
| BI 6658 | StartStopStatus_XXX | [Indoor unit] On/off status |
| BO 6659 | LockCommand_XXX | [Indoor unit] Remote controller lock command |
| BI 6660 | LockStatus_XXX | [Indoor unit] Remote controller lock status |
| BI 6661 | Filter Sign_XXX | [Indoor unit] Filter sign |
| BV 6662 | Filter Sign Reset_XXX | [Indoor unit] Filter sign reset |
| BO 65537 | StartStopCommand_XXX | [Ventilation] On/off command |
| BI 65538 | StartStopStatus_XXX | [Ventilation] On/off status |
| BO 65539 | LockCommand_XXX | [Ventilation] Lock command |
| BI 65540 | LockStatus_XXX | [Ventilation] Lock status |
| BI 65541 | Filter Sign_XXX | [Ventilation] Filter sign |
| BV 65542 | Filter Sign Reset_XXX | [Ventilation] Filter sign reset |
| BI 196609 | CompOperStatus _XXX | [Outdoor unit] Compressor running |
| MI 196610 | RefrigentType_XXX | [Outdoor unit] Refrigerant type |
| AI 196611 | InverterFanFreq_XXX | [Outdoor unit] Inverter fan 1 frequency |
| AI 196612 | HighPressure_XXX | [Outdoor unit] High pressure |
| AI 196613 | LowPressure_XXX | [Outdoor unit] Low pressure |
| AI 196614 | SunctionTemp_XXX | [Outdoor unit] Suction temperature |
Source
Formula and objects from BACnet Gateway (ACP BACnet) Installation/User Manual · MFL67709501 · rev. 2014 (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 LG instance number?
On LG's ACP BACnet and AC Smart BACnet, instance = product type x 65536 + unit address x 256 + point, and the address is read as hex. Indoor units are type 0, so unit 1A (= 26) has on/off BO 6657, mode MO 6663, fan speed MO 6667 and setpoint AV 6669. Ventilation units add 65536, outdoor units 196608.
Why is LG unit 1A's on/off 6657 and not 1A01?
It is the same number: 0x1A01 in hex is 6657 in decimal. LG puts the hex unit address in the middle byte, so address x 256 + point gives the decimal instance your BMS shows.
Does AC Smart use the same numbers as the ACP?
Yes. LG's AC Smart BACnet manual prints the same formula and the same indoor, ERV and outdoor tables. AC Smart 5 adds points 50 and up; BNU-BAC has a shorter list but the same numbers for the points it has.
Is this LG calculator official?
No. It applies the formula printed in LG'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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