AIRMAR
®
PB100 WeatherStation™ Technical Manual revision 1.009
2
4800 baud to output all sentences within a one second timeframe. Therefore, one or more
of the following remedies should be employed:
•
To conserve bandwidth, only enable for transmission those sentences required for
the given application, and disable all others.
•
Reduce the frequency of transmission for less critical sentences.
•
Increase the overall bandwidth eightfold by increasing the baud rate from the
standard 4800 baud to 38400 baud (though keep in mind that most NMEA 0183
instruments are not capable of operating at 38400 baud)
All NMEA sentences transmitted by the WeatherStation instrument include a checksum
at the end of the sentence, consisting of an asterisk (*) followed by two ASCII
hexadecimal characters. In the detailed specifications to follow, these hexadecimal
characters are designated by “
hh
”.
The standard NMEA 0183 sentences provided by the WeatherStation instrument are
summarized in Table 1. Each of the transmitted sentences in Table 1 is described in
detail on the subsequent pages.
The Maximum Length (chars) column in the table indicates an expected worst-case
scenario that can be used for bandwidth budgeting. The total time in seconds required to
transmit all enabled sentences in a single interval is
rate
baud
characters
of
number
Total
time
on
transmissi
Total
_
10
_
_
_
_
_
×
=
