SECTION SIX: Interfacing the 972 system
Page 26
972 Installation Manual, Rev. B
sentences—BWC, GLL, and RNN—are included to allow backwards compatibility with
marine equipment designed for this earlier version of 0183).
Selecting NMEA output sentences
When you select
0183
V2.1
as the output format (after pressing the
EDIT
menu key) and press
NMEA
output…
to see a screen showing all the NMEA 0183 sentences the 972 can output.
Three-letter abbreviations identify each sentence and are listed alphabetically. (For the meaning of
these sentences, see the NMEA interface specifications document published by the NMEA.) The
sentences to be output are followed by the word
On;
those that won’t be output have two dashes
indicating that they’re off. Some devices can’t handle all these sentences correctly, so you can
customize the output here by turning individual sentences on or off. In general, you may want to
turn on only those sentences used by the particular equipment interfaced to the 972.
Turning NMEA output sentences on and off
To turn on or off the 972
’s
NMEA 0183 sentences, first follow the above description to display the
0183 sentence
screen, then press the cursor pad to highlight the sentence you want to turn on or off,
then press
On/Off
to toggle the sentence on or off. Repeat for each sentence as desired. When you’re
finished, press
Return
to go back to the
Port Setup
screen.
If you want to set all the sentences to the factory settings for recommended output, press the
Safe
reset
menu key. If you want to turn on only a select few sentences for output, press the
All off
menu
key to turn off all sentences, then turn the desired ones back on.
Choosing the talker ID
The NMEA 0183 standard requires that the equipment you’re interfaced to—the “listener”—knows
what type of device is transmitting the data. The 972
’s
talker ID tells the listener that it is receiving
information from a navigation source, not a communications or sensor device—which transmits
completely different forms of data. Certain listening devices will only accept navigation data
identified as coming from specific types of equipment. The 972 lets you set its talker ID to GPS (GP),
or integrated instrument (II) to match what the listener device is expecting:
1. Check the listener device’s instruction manual to determine which “talker ID”
codes it will respond to.
Summary of Contents for 972
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Page 8: ...SECTION ONE Introducing the 972 Page 4 972 Installation Manual Rev B ...
Page 24: ...SECTION FOUR Networking the Northstar 972 Page 20 972 Installation Manual Rev B ...
Page 38: ...SECTION SIX Interfacing the 972 system Page 34 972 Installation Manual Rev B ...
Page 46: ...APPENDIX A 972 technical specifications Page 42 972 Installation Manual Rev B ...
