• 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.
• 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.
• 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.
For example, a value of 99
signifies that all data samples were determined to be valid
and processed during the averaging time. If some samples were determined to be
"missing", these samples were not processed and the reported signal quality is a
proportional value less than 99.
• Bytes 28-29 are the modulo 256 hexadecimal checksum of the ASCII values calculated
for bytes from 2 to 27.
Table 49 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, see 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, see note 3.
28-29 Hex checksum. For further information, see note 4.
Chapter 5 – Operation
141
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