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400W Series Installation Manual
Page 4-7
190-00356-02
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
Ω
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 mVDC
±
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
Ω
meter loads. When indicating TO, MAIN +TO is +190
±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
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
Ω
meter loads. When valid information is present
(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.
Содержание GNC 420AW
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