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Appendix F
Power (+)
Data Out
Data In
Ground (-)
Ground (-)
Data Out
Data In
Green
White
Black
Data Cable
eTrex Legend
Connector
Interface formats are selected from the Setup ‘Interface Page’ on page 46 of this
manual. The input/output lines on your eTrex Legend unit 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 3.0 interface format is supported by the eTrex Legend and
enables the unit to drive up to three NMEA devices.
NMEA 0183 Version 3.0 Approved Sentences:
GPGGA, GPGLL, GPGSA, GPGSV, GPRMB, GPRMC, GPRTE, GPVTG, GPWPL,
GPBOD
GARMIN Proprietary Sentences:
PGRME (estimated error), PGRMM (datum string), 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 and GBR 23 are the recom-
mended beacon receivers for use with the eTrex Legend. 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 Legend may be hard-wired to a serial connector using the Data Cable (see
Appendix B for more information). Refer to the wiring diagram and the eTrex Legend
unit data connection illustrated below.
The PC Interface Cable provided with this unit allows you to connect your eTrex
Legend to a PC-compatible computer’s serial port.
Wiring Diagram
68


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