Filter
Top Products
SECTION SIX: Interfacing the 957 system
Page 44 957 INSTALLATION MANUAL, Revision C1
3. Repeat for each sentence as desired. When you’re done,
press the RETURN menu key 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 957’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 loran (LC),
GPS (GP), or an integrated instrument (II). The 957 lets you set
its talker ID to LC, GP, or 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.
2. At the PORT 1 SETUP or PORT 2 SETUP screen, press the
CURSOR PAD to highlight the NMEA 0183 TALKER ID
option, then press the EDIT menu key.
3. Scroll through the three choices using the CURSOR PAD
to make your selection, and press the ENTER key. The
interfaced equipment will now receive the 0183 data in
the correct nav-source format.
Choosing the lat/lon
precision
For more flexibility when communicating with a variety of
other devices, you can set the precision level of the 0183
position information output by the 957. The choice you make
depends on the equipment to which you’re outputting the
NMEA data (for the number of digits of precision required for
that particular device, see the manufacturer’s instructions). You
have three choices:
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.