Vaisala WMT700 - Manual (Page 214)

User's Guide ______________________________________________________________________
WMT700 NMEA MWV Data Message
WMT700 NMEA MWV data message is as follows:
$<id>MWV,<dir>,<ref>,<spd>,<uni>,<sta>*<chk><CR><LF>
where
$
= Message header
<id> = Two character sensor ID; AA … ZZ
MWV = Fixed text
<dir> = Wind angle: 0 to 359 degrees
<ref> = Reference:
R = Relative
<spd> = Wind speed
<uni> = Wind speed unit:
K = Kilometers per hour
M = Meters per second
N = Knots
<sta> = Status:
A = Valid data
V = Invalid data
* = Fixed text
<chk> = Checksum (8-bit XOR, excluding $ and *)
<CR> = Carriage return code, ASCII 0DH
<LF> = Line feed code, ASCII 0AH
Example of the command and response:
$IIWIQ,MWV*2F<CR><LF>
$WIMWV,045,R,011.63,N,A*09<CR><LF>
Interpretation of the example message:
- Talker ID "II" queries the WMT700 NMEA MWV message
from sensor which has address parameter set to "WI".
- WMT700 responds with talker ID "WI" and the requested
MWV message. The reported relative wind direction is 045
degrees and the wind speed is 11.63 knots.
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.
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