Campbell SkyVUE 8, Product Manual

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5.1.11 CRC-16 codes on terminal commands
If CRC-16 on mode is set using the
Terminal
command, all terminal commands need a CRC-16.
A semi-colon is used to indicate start of the CRC-16 in 4-byte character, for example
open
0;233A
. The CRC-16 is calculated either from the start of a new line or after a [STX] up to but
not including the semi-colon. ETX can follow the CRC-16 if required.
To find the valid CRC-16 for a command, type the command and then type: ;????. For example,
typing
open 0;????
gives the response [CRLF]CRC>233A<CRC[CRLF] so 233A is the CRC-16.
The CRC-16 is not case sensitive.
NOTE:
Make sure the terminal software sends [CR] and not [CRLF] for the command-line
termination.
The table below gives some commonly used CRC-16 codes.
Terminal command CRC-16
open 0 233A
close D94E
status 7CE5
password EB85
terminal 0 (this command will
remove CRC-16 checking)
B576
defaults 7D8E
serial 7FCE
5.1.12 Service command
The service command triggers the SkyVUE 8 to go through a series of tests including tests that
require the white test surface (ceilometer calibration plate supplied) to be placed on the SkyVUE
8 windows.
The service command results in the following procedures:
l
System noise level including noise spike test
l
Detector maximum gain test
l
Simulates a clear night sky for calibration offset
l
Window contamination functionality test
l
Laser function and monitoring alarm check
SkyVUE™8 (CS136) LIDAR Ceilometer 58