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BACnet instance calculator · INBACHIT016O000 / 064O000 (Hitachi H-Link)

Intesis Hitachi VRF BACnet Instance Calculator

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The Intesis BACnet server for Hitachi VRF gives each indoor unit a block at its MAPS index x 100 and each outdoor unit a block at address x 25 + 1000.

Short answer

Indoor unit instance = index x 100 + offset, where the index is the unit's number in Intesis MAPS (not always its H-Link address). Outdoor unit instance = address x 25 + 1000 + offset. Indoor index 23's setpoint command is AO 2300; outdoor address 2's outdoor air temperature is AI 1050.

Intesis calculator

1-64
0-63
or a range of indoor unit index (maps) 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

    indoor = index x 100 + offset; outdoor = address x 25 + 1000 + offset

    PartMeaningRange
    indexIndoor unit index in Intesis MAPS1-16 or 1-64
    addressOutdoor unit address0-63
    offsetObject offset in the block0-11 / 0-6

    Use the index Intesis MAPS shows for the unit, which is not necessarily its H-Link address. Objects 0-2 command all units at once.

    Worked example: indoor index 23, outdoor address 2

    The first objects for indoor index 23, outdoor address 2 on the INBACHIT, worked out with the formula above:

    ObjectName (as printed)What it is
    BI 2300OxxUxxOn/Off_SOn/Off (status)
    BO 2300OxxUxxOn/Off_COn/Off (command)
    MI 2300OxxUxxMode_SMode (status)
    MO 2300OxxUxxMode_CMode (command)
    AI 2300OxxUxxSetpoint_SSetpoint (status)
    AO 2300OxxUxxSetpoint_CSetpoint (command)
    AI 1050OUxx_Outdoor Air Temp.Outdoor Air temperature
    AI 1051OUXX_Comp.Top Temp.CompressorTop temperature
    AI 1052OUXX_Total Real Comp. Freq.Total Real Compressor Freq.
    AI 1053OUXX_Total Comp. CurrentTotal Compressor Current
    AI 1054OUXX_Out Exp. Valve 1 OpenOut Exp. Valve 1 Open
    AI 1055OUXX_Discharge PressureDischarge Pressure

    Source

    Formula and objects from Intesis BACnet Server - Hitachi VRF User's Manual · rev. 2022/06 r1.2 (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 Intesis instance number?

    Indoor unit instance = index x 100 + offset, where the index is the unit's number in Intesis MAPS (not always its H-Link address). Outdoor unit instance = address x 25 + 1000 + offset. Indoor index 23's setpoint command is AO 2300; outdoor address 2's outdoor air temperature is AI 1050.

    Why does one instance match both an indoor and an outdoor unit?

    The two formulas overlap above 1000 (indoor index 10 starts at 1000, so does outdoor address 0), and the object type does not always tell them apart. The calculator lists every possible match; check the object name on the device.

    Is this Intesis calculator official?

    No. It applies the formula printed in Intesis'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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