Garmin eTrex Owner's Manual

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45Interface formats are selected from the ‘SETUP’ Page.The input/output lines on your eTrex are RS-232 compat-ible, allowing easy interface to a wide range of externaldevices, including PC’s, differential beacon receivers,marine autopilots and/or a second GPS receiver.The NMEA 0183 version 2.0 interface format issupported by the eTrex and enables the unit to drive upto three NMEA devices.NMEA 0183 Version 3.0 Approved Sentences:GPGGA, GPGLL, GPGSA, GPGSV, GPRMB, GPRMC,GPRTE, GPVTG, GPWPL, GPBODGarmin Proprietary Sentences:PGRME (estimated error), PGRMM (datum string),PGRMZ (altitude), PSLIB (beacon receiver control)DGPS (Differential GPS) corrections are acceptedin RTCM SC-104 version 2.0 format through the ‘DataIn’ line. The Garmin GBR 21 and GBR 23 is the recom-mended beacon receiver for use with the eTrex. Otherbeacon receivers with the correct RTCM format may beused, but may not correctly display status or allow tuningcontrol from the GPS unit.The eTrex may be hard-wired to a serial connec-tor using the Data Cable (see the Garmin web sitewww.garmin.com for ordering information). Refer tothe wiring diagram and the eTrex unit data connectionillustrated below.The optional PC Interface Cable allows you to connectyour eTrex to a PC-compatible computer’s serial port.eTrexConnectorDataCableGround (-)Data OutData InPower (+)GroundData OutData InWhiteGreenBlackAppendicesAppendix EWiring Diagram