Chapter 4 ________________________________________________________________ Operation
VAISALA _______________________________________________________________________ 63
The transmission time and size is the following:
total 75 characters
=> 0.31 s at 2400 bps (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 identical 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).
055
The second number of line: Height of the 1st cloud
layer (5500 ft or 550 m depending on feet or meter
selection).
5
The third number of line: Cloud amount of the 2nd
layer in oktas.
170
The fourth number of line: Height of the 2nd cloud
layer (17000 ft or 1700 m depending on feet or meter
selection).
0
The fifth number of line: Cloud amount of the 3rd layer
in oktas.
///
The sixth number of line: Height of the 3rd cloud layer.
0
The seventh number of line: Cloud amount of the 4th
layer in oktas.
///
The eighth number of line: Height of the 4th cloud
layer.
The reporting resolution is 100 ft or 10 m depending on feet or meter
selection. If the cloud amount is zero, the corresponding layer height
is ///.
