FT Technologies FT702LT - Page 59

Section 6 Parameter Settings
59 FT702LT Flat Front Wind Sensor Manual
6.4.25 WV Polar: Query the Wind Velocity Reading
Command
Parameter
WV (Polar)
Command
Syntax
SET Sensor:
N/A
QUERY Sensor:
$<listenerID>,WV?*<checksum><cr><lf>
$aa,WV?*hh<cr><lf>
FT702LT output:
$<talkerID>,WVP=<speed>,<angle>,<status>*<checksum>
<cr><lf>
$aa,WVP=xxx.x,xxx,x*hh<cr><lf>
Parameters
<speed>
000.0 to 050.0
measured wind speed in meters per second
<angle>
000 to 359
measured wind direction in degrees relative to FT702LT datum
< status >
0 to Z
Indicates whether an error condition was detected by the operating
system, such as out of range wind speed or incorrect signal level.
Any character other than ‘0’ (ASCII 30(HEX)) = error
Examples
Example 1
The following example illustrates the polar wind velocity data format. The example shows
the FT702LT output with a wind speed of 20m/s and a wind angle of 45deg.
Message
Comment
$01,WV?*//<cr><lf>
Query the wind velocity
$WI,WVP=020.0,045,0*73<cr><lf>
FT702LT polar response
Description
The WV command returns the wind velocity value in the currently selected format. Polar or
NMEA formats are available. Use the DF command, Section 6.4.4, to select the required
output format.
Polar Format: The FT702LT returns the magnitude of the wind speed (m/s) and the wind
direction (0-359 degrees).
NMEA 0183 Format: The FT702LT returns the NMEA 0183 Wind Speed and Angle
sentence MWV (see WV NMEA, Section 6.4.26).
It is recommended that the status
is always monitored. The status is
cleared once the WV command is
executed, provided that the error
condition does not persist.