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APPENDIX C
Wiring &
Interfaces
Interfacing formats are selected from the Setup
Menu, described on page 79. The input/output
lines on your GPS 12 MAP are RS-232 compatible
allowing easy interface to a wide range of external
devices, including PCs, differential beacon receiv-
ers, marine autopilots and/or a second GPS
receiver.
The NMEA 0183 version 2.3 interface format is supported by the GPS
12 MAP and enables the unit to drive up to three NMEA devices:
NMEA 0183 version 2.3 Approved sentences:
GPGGA, GPGLL, GPGSA, GPGSV, GPRMB, GPRMC, GPRTE, GPWPL,
GPBOD
Proprietary sentences:
PGRME (estimated error), PGRMM (map datum), PGRMZ (altitude),
PSLIB (beacon receiver control)
DGPS (Differential GPS) corrections are accepted in RTCM SC-104
version 2.0 format through the Data In line. A GARMIN Differential
Beacon Recevier (such as the GBR 21) is recommended for use with the
GPS 12 MAP. Other beacon receivers with the correct RTCM format may
be used, but may not correctly display status or allow tuning control
from the GPS unit.
The GPS 12 MAP may be hard-wired to a vehicle’s electrical system
(10-32 VDC) using an optional power/data cable. Consult the wiring
diagram to the right for proper connections. (The male connector on the
back of the GPS 12 MAP is illustrated.) A cigarette lighter adapter is also
available to power your GPS 12 MAP without making permanent
connections.
Additional cables are available to connect your GPS 12 MAP to a PC-
compatible computer’s serial port (PC Interface Cable) or to connect to a
second GPS 12 MAP (Data Cross-Load Cable). Contact your GARMIN
dealer for any of these accessories.
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