Garmin eTrex Summit Owner's Manual - Page 64
Appendix F, Wiring, Diagram - data cable
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Appendicies Appendices 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 3.0 Approved Sentences: GPGGA, GPGLL, GPGSA, GPGSV, GPRMB, GPRMC, GPRTE, GPWPL, GPBOD, HCHDG 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 61 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) eTrex Summit Connector Data In Data Out Ground Power (+) Data In Data Out Ground (-) Green White Black Data Cable 62