Users Manual

Operating Instructions Smart Weather Sensor
G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany 151
19.8.4 Message Format for Measurement Data MWD
The P9 / PP measurement data transmission can be optionally extended by a MWD
sentence containing wind data. The MWD sentence follows the definition for NMEA WI
(weather instrument) messages.
This option can be activated or deactivated by the GW command.
The JW command selects between spot value and average value output of wind data.
The message is field oriented, with variable length. The fields are separated by ','.
Message format:
$hhhhh, aaa.a,T,bbb.b,M,cc.c,N ,dd.d,M <CR><LF>
$hhhhh Message header, default $WIMWD (WI : Talker identifier “weather
instruments”, MWD: sentence identifier “wind measurements”) *)
, separator
aaa.a wind direction in °”
, separator
T identifier “True North”
, separator
bbb.b wind direction in °
, separator
M identifier “Magnetic Nord”
, separator
cc.c wind speed in knots
, separator
N unit: kts
, separator
dd.d wind speed in m/s
, separator
M unit: m/s
<CR><LF> sentence terminator
*) The message header can be modified. The MWD sentence uses the same talker ID as the
XDR sentence, which can be modified by the UMB config tool or the XDR setting command
NH. The leading '$' is and the identifier MWD are fixed and can not be modified
**) here wind direction “true” and wind direction “magnetic” are identical.