Chapter 3 ______________________________________________________ Functional Description
VAISALA _______________________________________________________________________ 25
BLSC Command
The background luminance sensor can be used in continuous or day/night
switch modes. When you give 1.0 as the BLSC value, the background
luminance measurement mode is continuous. When you give a zero as
the value, the measurement uses day/night switch mode.
When PWL111 is activated, its background luminance value is reported
in message 7 and in the Status message.
Continuous Mode
The following command activates the sensor and gives a positive scaling
factor to the luminance value.
>BLSC 1.0
The response is the following:
BL SCALE 1.000
Background luminance is reported in a range of 4 ... 20000 cd/m
2
with
the above setting.
Day/night Switch Mode
The following command activates the sensor in day/night switch mode,
that is, the luminance value is either 0 or 1. 0 indicates night time and 1
indicates day time.
>BLSC 0
Disabling PWL111
The negative scale directs PWD22/52 to skip the background luminance
action. See the example below:
>BLSC -1
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