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SECTION THREE - Interfacing
961 INSTALLATION MANUAL Revision A Page 53
Changing the
output rate
The 961 normally uses a two-second update interval for data transmis-
sion. Some applications require a longer update period, so the 961 lets
you increase that span to 199 seconds. You can choose a one-second
interval, but at that rate, the bandwidth of 4800-baud NMEA data only
allows the output of a reduced set of sentences.
To change the output rate:
1. From the PORT OUTPUT SETUP screen, press the
CURSOR PAD
to
highlight the SEND EVERY field.
2. Enter a number, then press the
ACCEPT
key (or press
CANCEL
to
leave the option unchanged).
Changing the
NMEA 0183
waypoint ID
Many marine electronic devices (such as radars and electronic plotters)
can display your waypoint names, rather than a number, if they’re output
by the 961.
If the peripheral equipment has this capability, at the PORT OUTPUT
SETUP screen, change the 961’s 0183 WAYPTS field from NUMBERS to
NAMES, by highlighting the field, making the change, and pressing the
ACCEPT
key. The listening device will now display the nine-character
waypoint names. Included spaces will be output. When exporting to
another device, be aware that the numerical identifiers aren’t assigned
sequentially and may be re-used by the system on a random basis.
Setting the NMEA
0183 checksums
Certain older devices may not accept sentences containing the NMEA
0183 checksum that’s output by the 961. In such cases, the device may
not operate properly, if at all.
If you encounter difficulty when interfacing to older equipment, the 961
offers you the flexibility of turning off the NMEA 0183 checksum:
1. At the PORT OUTPUT SETUP screen, press the
CURSOR PAD
to high-
light the 0183 SUM field, then press the
EDIT
key.
2. Press the
CURSOR PAD
to change the setting from ON to OFF.
3. Press the
ACCEPT
key (or press
CANCEL
to leave the option
unchanged).
4. Press the
RETURN
key to go back to the PORT SETUP screen.
Setting the auxiliary port
The auxiliary (aux) port is a general-purpose port used to transmit differ-
ential corrections (interfacing with an external device that accepts SC-104
NOTE:
Be sure to verify this capability in the listening device before
changing the
0183 WAYPTS
field. Most older equipment
won’t understand this identifier, and using it may cause prob-
lems with the display of the waypoint information.