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Description:
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dmsIllumBrightnessValues OBJECT-TYPE
SYNTAX OCTET STRING
ACCESS read-write
STATUS mandatory
DESCRIPTION
"<Definition> . An OCTET STRING describing the sign's light output in relationship to the Photocell(s) detection of ambient light. For each light output level, there is a corresponding range of photocell levels. The number of light output levels transmitted is defined by the first byte of the data packet, but cannot exceed the value of the dmsIllumNumBrightLevels object. Setting the value of this object to a non-supported or erroneous value shall lead to a genErr. Cause of this error shall be denoted by the dmsIllumBrightnessValuesError object.
After a SET, an implementation may interpolate these entries to create a table with as many entries as needed, but the value of the object shall not be affected by such interpolations.
For each light output level, there are three 16-bit values that occur in the following order: Light output level, Photocell level down, Photocell level up.
The light output level is a value between 0 (no light output) and 65535 (maximum light output). Each step is 1/65535 of the maximum light output (linear scale).
The Photocell-level-down is the lowest photocell level allowed to maintain the light output level. If the photocell level goes below this point, the light output level goes down one light output level.
The Photocell-level-up is the highest photocell level for this light output level. If the photocell level goes above this point, the light output level goes up one light output level.
The photocell level (Up and Down) values may not exceed the value of the dmsIllumMaxPhotocellLevel object.
The points transmitted should be selected so that there is no photocell level which does not have a light output level. Hysteresis is possible by defining the photocell-level-up at a level higher than the upper level's photocell-level-down.
The encoding of the structure shall consist of a one byte integer value indicating the number of rows in the table. This is followed by a series of OER encoded Strings of the following structure:
SEQUENCE {
lightOutput INTEGER (0..65535),
photocellLevelDown INTEGER (0..65535),
photocellLevelUp INTEGER (0..65535)}
If the sign does not support photocell and the dmsIllumControl object value is set to 'manualIndexed', then the values for the 'photocellLevelDown' and 'photocellLevelUp' still need to be entered that the table does not cause any errors as defined in the dmsIllumBrightnessValuesError object. However, since no photocell is supported, the entered values for 'photocellLevelDown' and 'photocellLevelUp' for the various 'lightOutputs' are meaningless.
<Object Identifier> 1.3.6.1.4.1.1206.4.2.3.7.7"
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