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Meeting Minutes - 29 April 2003

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  • Steve Karg
    BACnet - Lighting Applications Working Group Germantown, Maryland Participants Affiliation ... David Ritter Delta Controls Steve Karg Lithonia
    Message 1 of 1 , May 5, 2003
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      BACnet - Lighting Applications Working Group
      Germantown, Maryland

      Participants Affiliation
      ------------ -----------
      David Ritter Delta Controls
      Steve Karg Lithonia Lighting
      Steve Treado NIST
      Pete Baselici Lithonia Lighting
      Robert Hick Leviton Lighting
      Damon Wood Lightolier
      Dave Robin Automated Logic
      Hans Langels Siemens
      Jerry Martocci Johnson Controls
      Tom Lehrer Teng Solutions

      We reviewed the status of the proposal (STK-004) that had been sent to
      SSPC 135. It is being revised by Steve Karg after receiving several
      comments by committee members

      We started to develop a straw man for the DALI Object. We realized
      that we do not want this as the permanent name of the object, however
      it seemed efficient to use the DALI standard as a starting place.
      Other suggested names were Dimmer Object and Lighting Object.

      The approach was to first consider interoperability across Lighting
      vendors, then to consider interoperability with other industries (e.g.
      HVAC, Fire).

      We discussed the personality of the object, and how the control for it
      resembles 3 objects in one (Binary Output Object, Analog Output
      Object, and Multi-state Object). We discussed the priority array for
      the object.

      Following is the partial object definition of the DALI object. The
      conformance code column (Optional, Required) was not discussed at this
      meeting and will need to be reviewed at a future meeting.

      Table 12-x. Properties of the DALI Object Type
      Present_Value BACnetLightingState W
      Device_Type CharacterString O
      Luminance REAL O

      12.x.1 Object_Identifier
      This property, of type BACnetObjectIdentifier, is a numeric code that
      is used to identify the object. It shall be unique within the BACnet
      Device that maintains it.

      12.x.2 Object_Name
      This property, of type CharacterString, shall represent a name for the
      object that is unique within the BACnet Device that maintains it. The
      minimum length of the string shall be one character. The set of
      characters used in the Object_Name shall be restricted to printable
      characters.

      12.x.3 Object_Type
      This property, of type BACnetObjectType, indicates membership in a
      particular object type class. The value of this property shall be
      DALI.

      12.x.4 Present_Value
      This property, of type BACnetLightingState, defines the current
      commanded state of the DALI object as defined below:

      Command: Description
      --------------------
      Power Off: Cuts electrical power to the device. The last command and
      its priority are saved for use when the device is later Powered On.

      Power On: Applies electrical power to the device setting its luminance
      to the last commanded value.

      Ramp Up: Raises the luminance level at a given rate. The ramp up
      continues until another command is received or it reaches its maximum
      luminance. Ramp up can be applied with Power Off or Power On. When
      Powered Off the resulting luminance level is saved for use when the
      device is later Powered On.

      Ramp Down: Lowers the luminance level at a given rate. The ramp down
      continues until another command is received or it reaches its minimum
      luminance. Ramp down can be applied with Power Off or Power On. When
      Powered Off the resulting luminance level is saved for use when the
      device is later Powered On.

      Step Up: The luminance level is stepped up by a percent of the fade
      rate. The step up continues until another command is received or it
      reaches its maximum luminance. Step up can be applied with Power Off
      or Power On. When Powered Off the resulting luminance level is saved
      for use when the device is later Powered On.

      Step Down: The luminance level is stepped down by a percent of the
      fade rate. The step down continues until another command is received
      or it reaches its minimum luminance. Step down can be applied with
      Power Off or Power On. When Powered Off the resulting luminance level
      is saved for use when the device is later Powered On. If minimum
      luminance is reached, the light remains Powered On.

      Recall Maximum: Power is applied to the device if not already applied.
      and set to maximum luminance.

      Recall Minimum: Power is applied to the device if not already applied.
      and set to minimum luminance.

      Step Down + Off: The luminance level is stepped down by a percent of
      the fade rate. The step down continues until another command is
      received or it reaches its minimum luminance. Step down can be applied
      with Power Off or Power On. When Powered Off the resulting luminance
      level is saved for use when the device is later Powered On. If
      minimum luminance is reached during step down, the light is Powered
      Off.

      On + Step Up: Power is applied to the light if not already applied.
      The luminance level is then stepped up by a percent of the fade rate.
      The step up continues until another command is received or it reaches
      its maximum luminance.

      Go to Level: Power is applied to the light if not already applied..
      The luminance level is then set as a percentage 0 to 100. If the
      level set is 0 the light remains Powered On.

      Hold Level: Stops further level change for all commands.

      Blink: If the device is Powered On, it turns Power Off for the warning
      period. Power is then reapplied at the same luminance level prior to
      the Blink command.

      On + Ramp Up: Power is applied to the light if not already applied.
      The luminance level is then ramped up from the minimum luminance by a
      percent of the fade rate. The ramp up continues until another command
      is received or it reaches its maximum luminance.

      12.x.6 Device_Type
      This property, of type CharacterString, is a text description of the
      physical device connected to the analog output. It will typically be
      used to describe the type of device attached to the analog output.

      12.x.7 Luminance
      This property, of type REAL, indicates the actual value, in
      engineering units, of the output. This value is the linearized
      percentage (0..100) of the device's light output (LUMENS) of the
      object; 0 being dimmest, 100 brightest.

      We will continue defining the remaining properties at a future meeting
      or via Internet discussions. We discussed future meetings and agreed
      to meet whenever the SSPC planned to meet, possibly on Sunday
      afternoon, June 29, 2003, from 1 pm to 5pm, in Kansas City.

      Respectfully Submitted (and thanks to Jerry for note taking),

      Steve Karg
      Lithonia Lighting
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