Garmin GPS 500 Installation Manual

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Garmin GPS 500 Installation Manual Manual pdf 34 page image

Page 4-8 500 SERIES INSTALLATION MANUALRev Q 190-00181-024.4 MAIN INDICATOR4.4.1 Main Indicator FunctionThe Main Indicator displays both lateral and vertical deviation from selected course, To/From indications,lateral and vertical flags and superflags.The “CDI” key on the bezel of the GNS 530 takes the place of remote “NAV/GPS” switches, and is usedto toggle between display of GPS and VOR/ILS navigation display on a remote indicator. The Navigationsource is annunciated on the display above the ‘CDI’ key. The Navigation method is optionallyannunciated externally by connecting to the VLOC ANNUNCIATE output (P5001-1) and GPSANNUNCIATE output (P5001-2). GPS and VOR/ILS navigation may be toggled externally when theCDI SOURCE SELECT input (P5001-73) is momentarily grounded. See section 4.5 for more informationon the external annunciators and switches.An OBS resolver connection to the GPS is preferred, but not required. For the GNS 530, an OBS resolvertypically is connected to the MAIN OBS inputs for use with the GNS 530 VOR receiver.4.4.2 Main Indicator Electrical Characteristics4.4.2.1 DeviationPin Name Connector Pin I/OMAIN +LEFT P5001 21 OutMAIN +RIGHT (2.5V COMMON) P5001 22 OutMAIN +UP P5001 27 OutMAIN +DOWN (2.5V COMMON) P5001 28 OutThe Deviation output is capable of driving up to three 1000 : meter loads with r150 mVdc r10% for full-scale deflection. The drive circuit provides for more than full-scale deflection with a maximum coursedeviation output voltage of ±300 mVdc r10%.4.4.2.2 TO/FROMPin Name Connector Pin I/OMAIN +TO P5001 25 OutMAIN +FROM (2.5V COMMON) P5001 26 OutThe To/From output is capable of driving up to three 200 : meter loads. When indicating TO, MAIN +TOis +190 ±40 mVdc with respect to MAIN +FROM. When indicating FROM, MAIN +TO is -190 ±40mVdc with respect to MAIN +FROM. When invalid information is present (Flag IN VIEW) theTO/FROM output is 0 ±10 mVdc.4.4.2.3 FlagPin Name Connector Pin I/OMAIN LATERAL +FLAG P5001 23 OutMAIN LATERAL -FLAG (2.5V COMMON) P5001 24 OutMAIN VERTICAL +FLAG P5001 29 OutMAIN VERTICAL -FLAG (2.5V COMMON) P5001 30 OutThe Flag output is capable of driving up to three 1000 : meter loads. When valid information is present(Flag OUT OF VIEW) the Flag output is 375 ±80 mVdc. When invalid information is present (Flag INVIEW) the Flag output is 0 ±25 mVdc.