Garmin GPS 400W, Installation Manual

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GNS 400W Series Installation Manual Page 4-7
190-00356-08 Rev. G
4.4 Main Indicator
4.4.1 Main Indicator Function
The 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 430W takes the place of remote ―NAV/GPS‖ switches, and is
used to toggle between display of GPS and VOR/ILS navigation display on a remote indicator. The
Navigation source is annunciated on the display above the ‗CDI‘ key. The Navigation method is
optionally annunciated externally by connecting to the VLOC ANNUNCIATE output (P4001-1) and
GPS ANNUNCIATE output (P4001-2). GPS and VOR/ILS navigation may be toggled externally when
the CDI SOURCE SELECT input (P4001-73) is momentarily grounded. See section 4.5 for more
information on the external annunciators and switches.
An OBS resolver connection to the GPS is preferred, but not required. For the GNS 430W, an OBS
resolver typically is connected to the MAIN OBS inputs for use with the GNS 430W VOR receiver.
4.4.2 Main Indicator Electrical Characteristics
4.4.2.1 Deviation
Pin Name Connector Pin I/O
MAIN +LEFT P4001 21 Out
MAIN +RIGHT (1.65V COMMON) P4001 22 Out
MAIN +UP (1.65V COMMON) P4001 27 Out
MAIN +DOWN P4001 28 Out
The deviation output is capable of driving up to three 1000 meter loads with 150 mVDC 10% for
full-scale deflection. The drive circuit provides for more than full-scale deflection with a maximum
course deviation output voltage of ±300 mV
10%.
4.4.2.2 TO/FROM
Pin Name Connector Pin I/O
MAIN +TO (1.65V COMMON) P4001 25 Out
MAIN +FROM P4001 26 Out
The output is capable of driving up to three 200 meter loads. When indicating TO, MAIN +TO is +250
±40 mV with respect to MAIN +FROM. When indicating FROM, MAIN +TO is -250 ±60 mV with
respect to MAIN +FROM. When invalid information is present (Flag IN VIEW) the TO/FROM output is
0 ±10 mVDC.
4.4.2.3 Flags
Pin Name Connector Pin I/O
MAIN LFLAG P4001 23 Out
MAIN LATERAL -FLAG (GROUND) P4001 24 Out
MAIN VEFLAG P4001 29 Out
MAIN VERTICAL -FLAG (GROUND) P4001 30 Out
The 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 300 ±30 mVDC. When invalid information is present (Flag IN
VIEW) the Flag will have an output is 0 ±25 mVDC.