Vaisala CT25K - Page 48

Ceilometer CT25K
User’s Guide CT25K-U059en-2.1
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Interpretation of the message is as follows :
1ST LINE
Example: (CTA2010J↵
where
( Start-of-Heading character
CT Ceilometers’ identification string; always CT
A Unit number 0...9, A...Z
20 Software level id 00...99
1 Message number; this message is always = 1
0 Spare character for future subclasses of message
J Start-of-Text Character
2ND LINE
Example: 30 01230 12340 23450 FEDCBA98↵
where
3 First digit of line: detection status as follows:
0 No significant backscatter
1 One cloud base detected
2 Two cloud bases detected
3 Three cloud bases detected
4 Full obscuration determined but no cloud base detected
5 Some obscuration detected but determined to be transparent
/ Raw data input to algorithm missing or suspect
0 Second digit of line: Warnings and Alarm information as follows:
0 Self-check OK
W At least one Warning active, no Alarms
A At least one Alarm active
01230 If detection status is 1, 2 or 3: Lowest cloud base height
If detection status is 4: Vertical Visibility as
calculated
If detection status is 0 or 5: /////
12340 If detection status is 2 or 3: Second lowest cloud base
height
If detection status is 4: Highest signal detected
If detection status is 0, 1 or 5: /////
23450 If detection status is 3: Highest cloud base height
If detection status is 0, 1, 2, 4, 5: /////