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Appendix F
Wiring
Diagram
Interface formats are selected from the SETUP Page.
The input/output lines on your eTrex Summit are RS-232
compatible, allowing easy interface to a wide range of
external devices, including PC’s, differential beacon
receivers, marine autopilots and/or a second GPS receiver.
The NMEA 0183 version 2.0 interface format is
supported by the eTrex Summit and enables the unit to
drive up to three NMEA devices.
NMEA 0183 Version 2.0 Approved Sentences:
GPGGA, GPGLL, GPGSA, GPGSV, GPRMB,
GPRMC, GPRTE, GPWPL, GPBOD
GARMIN 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. The GARMIN GBR 21 is the recommended beacon
receiver for use with the eTrex Summit. 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 eTrex Summit may be hard-wired to a serial
connector using the Data Cable (see page 8 for ordering
information). Refer to the wiring diagram and the eTrex
Summit unit data connection illustrated below.
The optional PC Interface Cable (010-10206-00)
allows you to connect your eTrex Summit to a PC-
compatible computer’s serial port.
Appendices
Appendicies
eTrex
Summit
Connector
Data
Cable
Ground (-)
Data Out
Data In
Power (+)
Ground
Data Out
Data In
White
Green
Black
UA-1005.060
