Vaisala WMT700 - Manual (Page 160)

User's Guide ______________________________________________________________________
WS425 A/B NMEA Extended Data
Message
WS425 A/B NMEA Extended data message is as follows:
$P<id>MWV,<dir>,<ref>,<spd>,<uni>,<sta>*<chk><CR><LF>
where
$P
= Fixed text
<id> = Data ID; A … Z
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
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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