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Appendix H
Wiring and
Interfacing
Connecting the Power/Data
The power/data cable connects the GPSMAP 182/182C/232 to a DC system and provides interface
capabilities for connecting external devices. The color code in the diagram below indicates the appro-
priate harness connections. Replacement fuse is a AGC/3AG 1.5 Amp fuse. For wiring the GPSMAP to
a GSD 20 Sonar Module, refer to the “GSD 20 Installation Guide”(190-00255-00).
Interfacing
The following formats are supported for connection of external devices: Garmin proprietary GSD
20 Sonar Module and Differential GPS (DGPS), NMEA 0183 version 2.3 (3.01 on GPSMAP 182C
software version 5.20 & GPSMAP 182/232 4.20 and higher) , RTCM SC-104 input (version 2.0).
The following are the sentences for NMEA 0183, version 2.3 and later output:
Approved sentences— GPBWC, GPRMC, GPGGA, GPGSA, GPGSV, GPGLL, GPBOD, GPRMB, GPRTE,
GPVTG, GPWPL and GPXTE. Proprietary sentences— PGRME, PGRMM, PGRMZ, and PSLIB.
The GPSMAP 182/182C/232 also includes NMEA input with support for the WPL sentence and sonar
NMEA input with support for the DPT (Depth), MTW (Water Temp) and VHW (Water Speed & Head-
ing) sentences. If connecting to COM2 for sonar NMEA input, the unit interface must be set to NMEA
In/NMEA Out (see page 65). If connecting to COM1, the unit must be set to NMEA In/NMEA Out.
1
2
3
4
5
6
7
PIN 1 (red) 182C: 10-35vDC; 182/232: 8-35vDC
PIN 2 (black) Ground (Power and Data)
PIN 3 (blue) NMEA OUT (Com 1 TX)
PIN 4 (brown) NMEA IN (Com 1 RX)
PIN 5 (white) RTCM/NMEA IN (Com 2 RX)
PIN 6 (green) NMEA OUT (Com 2 TX)
PIN 7 (yellow) Alarm Low
NMEA
Device with
Sonar Output
TXD +
Alarm Relay
100ma max
coil current
GSD 20,
Beacon
Receiver or
DSC VHF
Autopilot/
NMEA Device
DC
Power Source
RXD +
RXD -
RX+
TX+
Documentation concerning NMEA
&RTCM formats and sentences
are available for purchase from:
National Marine Electronics
Association (NMEA)
Seven Riggs Avenue
Severna Park, MD 21146
U.S.A.
410-975-9425
410-975-9450 FAX
www.nmea.org
Radio Technical Commission For
Maritime Services (RTCM)
1800 Diagonal Road, Suite 600
Alexandria, VA 22314-2480
U.S.A.
703-684-4481 (Info Only)
703-836-4229 FAX
www.rtcm.org
You can download a copy of Garmin's
proprietary communication protocol the
Help and Support section of our web site at
www.garmin.com.
182C Manual Part 2.indd 87 6/4/2003, 2:54:33 PM
97


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