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  1. #1
    Join Date
    Nov 2006
    Location
    CA Central Valley
    Posts
    437

    BACnet/Modbus Translator point-- MODEHVAC

    I am interfacing Alerton's Envision for BACtalk with a couple Carrier return air units, and the Carrier rep gave me an analog read-only point called MODEHVAC.

    Does anyone know what I can expect to see out of this point and what the numbers mean?

  2. #2
    Join Date
    Nov 2006
    Location
    CA Central Valley
    Posts
    437
    Well, someone provided me with a list for the 48/50 series Carrier RTU, which is one of the ones I'm working with:


    0 Startup
    1 Disabled
    2 Shutting Down
    3 Softstart Request
    4 Rem. Sw. Disabled
    5 Fan Status Fail
    6 Static Pressure Fail
    7 Comp. Stuck On
    8 Off
    9 Test
    10 Tempering Vent
    11 Tempering Lo Cool
    12 Tempering Hi Cool
    13 Vent
    14 Low Cool
    15 High Cool
    16 Low Heat
    17 High Heat
    18 Unoc. Free Cool
    19 Fire Shut Down
    20 Pressurization
    21 Evacuation
    22 Smoke Purge
    23 Dehumidification
    24 Reheat


    Now, if I do a little programming in the BCM DDC, I can have a bunch of alarms in my EBT displays (since I can't program an alarm graphic only if an AV point is a specific value).
    Last edited by dngrsone; 03-12-2007 at 05:05 PM.

  3. #3
    Join Date
    Dec 2006
    Location
    Chicago area
    Posts
    43

    MODEHVAC to HVAC_MODE

    Hi,

    It looks from this enumeration list that this Carrier output is sort of intended to provide something similiar to combination of SNVT_hvac_status and maybe SNVT_hvac_mode. It looks like to map this to the LonMark world a type translator would do this for you.

    Regards

  4. #4
    Join Date
    Nov 2006
    Location
    CA Central Valley
    Posts
    437
    Added #6-- Static Pressure Fail

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