Vaisala CT25K - 5.2 Technical Description; 5.2.1 General

Ceilometer CT25K
CT25K-U059en-2.1 User’s Guide
39
999 minimizes the threshold, and thus, maximizes recording sensitivity to a
backscatter value of 100 / (10,000 km srad).
4TH LINE
Identical to the 3rd line of message no. 3.
4.4.4 Data Message No. 4
Data message no. 4 is not in use.
4.4.5 Data Message No. 5
Data message no. 5 is not in use.
4.4.6 Data Message No. 6
Message number 6 is similar to message number 1 but extended with a sky
condition line (section 5.4.). For interpretation, see paragraph 4.4.1.
Message number 6 format example:
(
CTA2060
J
↵ 1st line 11 char.
30 01230 12340 23450 FEDCBA98↵ 2nd line 31 char.
3 055 5 170 0 /// 0 ///↵ 3rd line 30 char.
L
↵ 4rd line 3 char.
------------------
total 75 characters
Transmission time and size :
total 75 characters
=> 0.31 s at 2400 baud (10 bit char.)
=> 18.0 kBytes/h, 432 kBytes/d, 12.7 MBytes/mo. at 4 msg/min,
uncompressed
Message interpretation :
LINES 1 and 2 are indentical to that of Message number 1.
LINE 3
Example: 3 055 5 170 0 /// 0 ///
where
3 The first number of line: detection status as follows:
0 ... 8 Cloud amount of the first layer in oktas
9 Vertical visibility
-1 Data missing or the ceilometer is in standby mode
99 Not enough data (after start-up)