Vaisala WMT700 - Manual (Page 50)

TECHNICAL REFERENCE___________________________________________________________
48 __________________________________________________________________ M211097EN-C
WS425 F/G ASOS Data Message
WMT700 responds to the WA command with a data message described
in Table 13 below.
Table 13 WS425 F/G ASOS Data Message
Byte Description
1
Start of text
2 Sensor ID
3 Command identifier
4 Sensor status:
P = Pass
F = Fail
H = Heater failure
For further information, refer to notes 1 and 2.
5-7 Averaged wind direction (degrees)
8-10 Wind direction (degrees) @ peak wind speed
11-12 Averaging time for wind speed and direction
13-14 Averaging time for peak wind speed and direction (seconds)
15-19 Averaged wind speed
20-24 Peak wind speed since last WA command
25 Wind speed unit:
M = miles per hour
K = knots
L = kilometers per hour
T = meters per second
26-27 Signal quality. For further information, refer to note 3.
28-29 Hex checksum. For further information, refer to note 4.
30 End of text
31 Carriage return
32 Line feed
Notes:
1. The sensor status (byte 4) indicates the following:
- P (Pass) indicates that all diagnostic tests have passed and
WMT700 is functioning normally.
- F (Fail) indicates that one or more of the diagnostic tests have
failed. You can then request diagnostics and extended tests
(WS) to further isolate the problem.
- H (Heater failure) indicates that the wind reading is valid but
one or more built-in heater diagnostic tests have failed.
2. When the status byte is F, the wind direction fields are set to 999
and the wind speed fields are set to 999.9 in the applicable sensor
response messages.
3. The signal quality (bytes 26-27) is a numeric value from 0 to 99
representing the data quality of processed data samples during the
averaging time.