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SECTION SIX: Interfacing the 958 system
Page 26 958 Installation Manual, Rev. A1
• 0183 Ray is used when transmitting/receiving position information to or from
Raytheon equipment. In Raytheon’s NMEA 0183 format, the checksum isn’t used.
(Note: Since the checksum isn’t used, the 958 may receive incorrect NMEA data
when connected to an external Raytheon loran.)
• NMEA 0183 Version 2.1 is a general-use interface output format used by most
autopilots, radars, plotters, and other equipment. (NMEA 0183 Version 1.5
sentences—BWC, GLL, and RNN—allow backwards compatibility with marine
equipment designed for this earlier version of 0183).
• Radar is used when the 958 is connected to a Northstar radar.
Displaying NMEA output sentences
When you select 0183 or 0183 RAY as the output format (after pressing the EDIT menu key) and
press ENTER, a screen is displayed showing all the NMEA 0183 sentences the 958 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 958.
Turning NMEA output sentences on and off
To turn on or off the 958’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 EDIT. Press the CURSOR PAD to toggle the sentence on or off, and press ENTER to
make your selection (or CLEAR to leave it unchanged). Repeat for each sentence as desired. When
you’re done, press RETURN to go back to the PORT SETUP screen.
NOTE:
The NMEA ON/OFF item list controls only the Version 2.01 GLL and BWC
items, not the 1.5 version of these items. Thus, ON/OFF changes made to
the Version 1.5 GLL and BWC output items have no effect on the data
actually output unless you select that particular format version.