Main Indicator - Garmin GNS 530W 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" button on the bezel of the GNS 530W 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' button. The Navigation method is
optionally annunciated externally by connecting to the VLOC ANNUNCIATE output (P5001-1) and
GPS ANNUNCIATE output (P5001-2). GPS and VOR/ILS navigation may be toggled externally when
the CDI SOURCE SELECT input (P5001-73) 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 530W, an OBS
resolver typically is connected to the MAIN OBS inputs for use with the GNS 530W VOR receiver.
4.4.2 Main Indicator Electrical Characteristics
4.4.2.1 Deviation
Pin Name
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 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
MAIN +TO (1.65V COMMON)
MAIN +FROM
The output is capable of driving up to three 200 Ω meter loads. When indicating TO, MAIN +TO is
+250 ±40 mV DC with respect to MAIN +FROM. When indicating FROM, MAIN +TO is -250 ±40 mV
DC with respect to MAIN +FROM. When invalid information is present (Flag IN VIEW) the TO/FROM
output is 0 ±10 mV DC
.
4.4.2.3 Flags
Pin Name
MAIN LATERAL +FLAG
MAIN LATERAL -FLAG (GROUND)
MAIN VERTICAL +FLAG
MAIN VERTICAL -FLAG (GROUND)
The Flag outputs are 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 mV DC
(Flag IN VIEW) the Flag output is 0 ±25 mV DC
Page 4-8
Rev. D
Connector
P5001
P5001
P5001
P5001
.
Connector
P5001
P5001
Connector
P5001
P5001
P5001
P5001
When invalid information is present
.
.
500W Series Installation Manual
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
190-00357-02