Vaisala WMT700 - Manual (Page 157)

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 = Kilometers per hour
M = Meters per second
N = Knots
<sta> = Status:
A = Data 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