Vaisala WINDCAP WS425 Betriebsanweisung Seite 157

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Chapter 5 _________________________________________________________________ Operation
To start continuous measurement, use the START command.
You can stop the measurement with the STOP command. For
instructions, refer to sections START Start Continuous
Measurement and STOP — Stop Wind Measurement on page
115.
WS425 A/B NMEA Standard Data
Message
The standard variable length, comma-separated, MWV wind
message is defined by NMEA 0183 V2.20 as follows:
$WIMWV,<dir>,<ref>,<spd>,<uni>,<sta>*<chk><CR><LF>
where
$WIMWV
=
Fixed text
<dir>
=
Wind angle: 0 to 359 degrees
<ref>
=
Reference:
R = Relative
<spd>
=
Wind speed
<uni>
=
Wind speed unit:
K = K
ilometers per hour
M = M
eters per second
N = Knots
<sta>
=
Status:
A = D
ata valid
V = Invalid data
*
=
Fixed text
<chk>
=
Checksum (8-bit XOR, excluding $ and *)
<CR>
=
Carriage return code, ASCII 0DH
<LF>
=
Line feed code, ASCII 0AH
NOTE
When the NMEA Standard profile is selected, the
autoInt parameter
must have a non
-zero value since no polling command is defined for this
profile.
Missing Readings
If data is missing due to a measurement problem, the NMEA
messages show "V" in the status field. Wind speed and wind
direction fields are left empty.
VAISALA _______________________________________________________________________ 155
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