NorthStar 961 Install Manual page 60

SECTION THREE - Interfacing
Choosing the
NMEA 0183
talker ID
Setting NMEA
0183 lat/lon
precision
Page 50
Part of the NMEA 0183 standard requires that the equipment you're
interfaced to—the "listener"—knows what type of device is transmitting
the data. The talker ID tells the listener that it's receiving information
from a navigation source (the 961/962) and not a communications or
sensor device, which transmit completely different—and therefore
unusable—forms of data.
The talker ID enables you to configure the 961/962's output data to tell
the listener it's receiving data from either a GPS (GP) navigator or
Integrated Instrument (II). The choice you make depends on 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 SETUP screen, select the desired port, then highlight the
TALKER ID field.
3. Press the key, and highlight the desired ID.
4. Press key (or press
unchanged). The interfaced equipment will now receive the 0183
data in the specified talker ID.
For added versatility in communicating with a variety of other devices,
you can control the precision with which the 961/962 outputs its lat/lon
information.
The choice you make depends on the equipment to which you're
outputting NMEA data. The 961/962 conforms to the NMEA version 2.1
standard, and is also compatible with version 1.5. Equipment that
typically benefits the most from three and four decimal places of
precision are electronic and pen-plotting devices. However, most older
devices designed to operate with the original 0183 and other formats can
only function with two-place precision. Refer to the manufacturer's
instructions for the number of digits of precision required for that
particular device.
The factory setting is .XXX' (thousandths of minutes). To change the lat/
lon precision setting:
1. From the PORT SETUP screen, select the desired port by pressing the
, , or
highlight the 0183 PREC field, then press the
2. Press the
XX.XX ' (lat/lon precision to two decimal places / hundredths of
>
minutes / or 60 feet)
XX.XXX ' (three decimal places / thousandths of minutes / or 6 feet)
>
XX.XXXX ' (four decimal places / ten-thousands of minutes / or
>
approximately ½ foot)
to leave the option
key. At the PORT OUTPUT SETUP screen,
to select the following options:
961/962 INSTALLATION MANUAL Revision A
key.