Main Indicator - Garmin 500 Series 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 530 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 (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 530, an OBS resolver
will typically be connected to the MAIN OBS inputs for use with the GNS 530 VOR receiver.
4.4.2 Main Indicator Electrical Characteristics
4.4.2.1 Deviation
Pin Name
MAIN +LEFT
MAIN +RIGHT (2.5V COMMON)
MAIN +UP
MAIN +DOWN (2.5V COMMON)
The deviation output is capable of driving up to three 1000 Ω meter loads with ±150 mV
scale deflection. The drive circuit provides for more than full-scale deflection with a maximum course
deviation output voltage of ± 300 mV
4.4.2.2 TO/FROM
Pin Name
MAIN +TO
MAIN +FROM (2.5V COMMON)
The output is capable of driving up to three 200 Ω meter loads. When indicating TO, MAIN +TO is
+190 ± 40 mV with respect to MAIN +FROM. When indicating FROM, MAIN +TO is -190 ± 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 Flag
Pin Name
MAIN LATERAL +FLAG
MAIN LATERAL -FLAG (2.5V COMMON)
MAIN VERTICAL +FLAG
MAIN VERTICAL -FLAG (2.5V COMMON)
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 mV
VIEW) the Flag output is 0 ± 25 ± mV
500 SERIES INSTALLATION MANUAL
P/N 190-00181-02
Connector
P5001
P5001
P5001
P5001
± 10%
DC .
Connector
P5001
P5001
Connector
P5001
P5001
P5001
P5001
When invalid information is present (Flag IN
DC.
DC.
Pin I/O
21 Out
22 Out
27 Out
28 Out
± 10% for full-
DC
Pin I/O
25 Out
26 Out
Pin I/O
23 Out
24 Out
29 Out
30 Out
Page 4-7
Page Rev. B
DC