Chapter 5 ________________________________________________________________ Operation
VAISALA_______________________________________________________________________ 65
2ND LINE
Example: 30 01230 12340 23450 FEDCBA987654
where
3 = Detection status:
0
1
2
3
4
5
/
Detection status as follows:
No significant backscatter
One cloud base detected
Two cloud bases detected
Three cloud bases detected
Full obscuration determined but no cloud
base detected
Some obscuration detected but determined
to be transparent
Raw data input to algorithm missing or
suspect
0 = W & A information:
0
W
A
Warning and Alarm information as
follows:
Self-check OK
At least one Warning active, no Alarms
At least one Alarm active
01230 = Lowest cloud base height
Vertical Visibility as calculated
/////
If detection status is 1, 2, or 3
If detection status is 4
If detection status is 0 or 5
12340 = Second lowest cloud base height
Highest signal detected
/////
If detection status is 2 or 3
If detection status is 4
If detection status is 0, 1, or 5
23450 = Highest cloud base height
/////
If detection status is 3
If detection status is 0, 1, 2, 4, 5
FEDC
BA98
7654
= Alarm (A), Warning (W), and internal status (S) information. Each character is a
hexadecimal representation of four bits, that is, values between 0 and 9 are
presented with numbers and values 10, 11, 12, 13, 14, and 15 are presented with
letters A, B, C, D, E, and F, respectively. As each of the 12 characters represent
the sum of four individual bits, the total number of bits is 48 (b00-b47), with the
following breakdown and interpretation:
F: b47 (8000 0000 0000) Transmitter shut-off (A)
b46 (4000 0000 0000) Transmitter failure (A)
b45 (2000 0000 0000) Receiver failure (A)
b44 (1000 0000 0000) Voltage failure (A)
E: b43 (0800 0000 0000) (Spare) (A)
b42 (0400 0000 0000) Memory error (A)
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