Table 6-2: SET transmitted/echoed data
Example
Description
0
Hood heater override
0
Dirty window compensation
1
CRC checking on received commands
9.5
Sensor power down voltage
0
Enable alarm
0
Alarm high/low
10000
Alarm level
:
Delimiting character
0146
Checksum (use the valid CCITT checksum)
:
Delimiting character
0x03
1
ETX
0x0D
1
Carriage return
1
These values are shown in hexadecimal format not ASCII.
6.4.2 SETNC command
The format of the
SETNC
command is the same as the
SET
command except it starts with
SETNC
. The only functional difference is that the
SETNC
command does not commit the values
set into flash memory. This means that the next time the CS140 is power cycled it will revert back
to its previous settings. This command should be used when a setting in the sensor is changed
regularly, e.g. heater functions, as this command avoids the risk of wearing out the flash storage
memory.
NOTE:
This includes communication data rates as well.
6.4.3 GET command
The
GET
command retrieves settings data from the CS140, including message format data and
user alarm settings amongst others. This command does not retrieve visibility or environmental
information from the CS140. To retrieve visibility data refer to the
POLL
command.
CS140 Background Luminance Sensor
20
