Vaisala FS11 - Optional External Sensors; LM21 Background Luminance Sensor; Day;Night Sensor

Chapter 4 _________________________________________________________________ Operation
VAISALA ________________________________________________________________________ 91
Table 12 Default Factory Parameter Settings
Parameter
Default Setting
Message type
2
Message interval
15
Message port
Data
ACK/NAK confirmation
Off
Second Message port
None
Unit_id
-
Name
-
Data_port baud
9600
Data_port mode
RS-232
Data_port parity
8N1
Module modem (DMX501 only)
Off
Maintenance_port baud
9600
Port timeout
10
Terminal_lines
24
Contamination_compensation visibility_sensor
On
Contamination_compensation bl_sensor
On
Bl_sensor
Off
Visibility Sensor
On
Hood_heaters visibility_sensor
On
Hood_heaters bl_sensor
On
Dew_heaters visibility_sensor
On
Dew_heaters bl_sensor
On
Message_frame
On
+12VOUT
Off
Optional External Sensors
LM21 Background Luminance Sensor
The configuration command SET BL_SENSOR LM21 is used to add
the LM21 sensor output into the FS11 system and the data messages.
With this command, the interface unit CPU starts polling the LM21
sensor through the internal RS-485 sensor interface.
Day/Night Sensor
The Day/Night sensor (photo switch) output is measured and included
into the FS11 data messages with the configuration command SET
BL_SENSOR PHOTO_SWITCH.
A positive voltage is interpreted as a night condition and the background
luminance value in the FS11 output message is set to 0. Zero voltage or
an open circuit is interpreted as a day condition and the luminance value
is set to 1.