Blsc Command; Continuous Mode; Day/Night Switch Mode; Disabling Pwl111 - Vaisala PWD22/52 User Manual

USER'S GUIDE____________________________________________________________________
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BLSC Command

The background luminance sensor can be used in a continuous or
day/night switch mode. When you give a positive BLSC value, the
background luminance measurement mode will be continuous. When you
give a zero value, the measurement turns into 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 the positive
scaling factor for the luminance value. See the example below:
>BLSC 1.0
The response is the following:
BL SCALE 1.000
Background luminance is reported in a range of 4 ... 20000 cd/m
the above settings.

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. Zero indicates night time and
one indicates day time. See the example below:
>BLSC 0

Disabling PWL111

The negative scale directs PWD22/52 to skip the background luminance
action. See the example below:
>BLSC -1

BLCAL Command

PWD22/52 calculates the new BL scale if the current background
2
luminance in cd/m
sensor must be already activated by the BLSC command. When you type
the following command, PWD22/52 calculates the BL scale.
>BLCAL 12300
is known. The BL scale must be >0. Also the BLSC
2
with