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Chapter 5 ________________________________________________________________ Operation
VAISALA _______________________________________________________________________ 53
Messages 5 and 6
Messages 5 and 6 are for message emulation of MITRAS
Transmissometer.
Message 7
Message 7 is meant for aviation specific purposes mainly. The message
format is same as in FD12P message 7.
Example for PWD22:
00
6839
7505
R
---- instant present weather, NWS codes
------ visibility ten minute average, max 20000m
------ visibility one minute average, max 20000m
- 1=hardware error, 2= hardware warning,
3= backscatter alarm, 4= backscatter warning
- 1= visibility alarm 1,
3= visibility alarm 3
-RA
, instant METAR weather codes
RERA , recent METAR weather (RE criteria used)
The following is an example with frames:
□
□
PW
1
00
6839
7505
-RA
RERA
□
S
S
H
PW
1
X
00
6839
7505
C
L
-RA
R
F
C
L
RERA
R
F
E
C
L
X
R
F
1234567890123456789012345678901234567890123456789012345678901234567
Message 7 consists of three lines. METAR present weather codes are
output on the second and third lines. These lines are not of fixed length
because METAR codes can be combined in many ways. The METAR
codes may also be left out but the lines of the message are always
terminated by a carriage return and line feed characters.
61 61 61
0.33
------- cumulative water sum
------- prec. water intensity,mm/h
--- 1 hour pw code, 0... 99
--- 15 minute pw code, 0 ... 99
--- instant present weather code, 0 ... 99
2= visibility alarm 2,
R
61 61 61
0.33
R
61 61 61
0.33
12.16
0
23.4 12345
-----
------ Temp
----- cum. snow sum
12.16
0
23.4 12345
12.16
0
23.4 12345
background
luminance,
cd/m²
C
L
R
F
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Troubleshooting
