Main Indicator; Main Indicator Function; Main Indicator Electrical Characteristics - Garmin GPS 400W Installation Manual

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
MAIN +LEFT
MAIN +RIGHT (1.65V COMMON)
MAIN +UP (1.65V COMMON)
MAIN +DOWN
The deviation output is capable of driving up to three 1000
full-scale deflection. The drive circuit provides for more than full-scale deflection with a maximum
course deviation output voltage of ±300 mVDC 10%.
4.4.2.2 TO/FROM
MAIN +TO (1.65V COMMON)
MAIN +FROM
The output is capable of driving up to three 200
±40 mVDC with respect to MAIN +FROM. When indicating FROM, MAIN +TO is -190 ±40 mVDC
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
MAIN LATERAL +FLAG
MAIN LATERAL -FLAG (GROUND)
MAIN VERTICAL +FLAG
MAIN VERTICAL -FLAG (GROUND)
The Flag output is capable of driving up to three 1000
(Flag OUT OF VIEW) the Flag output is 375 ±80 mVDC. When invalid information is present (Flag IN
VIEW) the Flag will have an output is 0 ±25 mVDC.
400W Series Installation Manual
190-00356-02
Pin Name
Pin Name
meter loads. When indicating TO, MAIN +TO is +190
Pin Name
Connector
P4001
P4001
P4001
P4001
meter loads with 150 mVDC 10% for
Connector
P4001
P4001
Connector
P4001
P4001
P4001
P4001
meter loads. When valid information is present
Pin I/O
21 Out
22 Out
27 Out
28 Out
Pin I/O
25 Out
26 Out
Pin I/O
23 Out
24 Out
29 Out
30 Out
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Rev. G