Chapter 7 __________________________________________________ Getting the Data Messages
VAISALA_______________________________________________________________________ 91
TXT Text Transmission
These short text messages and their interpretation are shown in Table 11
on page 112.
The text transmission response format:
$WITXT,xx,xx,xx,c--c*hh<cr><lf>
Table 8 Transducer Table
Transducer Type Units Field Comments
Temperature C C = Celsius
F = Fahrenheit
Angular displacement
(wind direction)
A D = degrees
Wind speed S K = km/h, M = m/s, N =
knots
S = mph, non-
standardized
1
Voltage U V = volts (also 50 %
duty cycle for heating)
N = not in use, F = 50%
duty cycle for heating,
W = full power for
heating
Generic G None (null)
P=percent
1. Not specified in the NMEA 0183 Standard.
where
$ = Start of the message
WI = Talker identifier (WI = weather instrument)
TXT = Text transmission identifier.
xx = Total number of messages, 01 to 99
xx = Message number.
xx = Text identifier (see text message table)
c---c = Text message (see text message table)
* Checksum delimiter
hh = Two-character checksum for the query command.
<cr><lf> = Response terminator
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