Nav I/O Connector - Garmin GNS 480 Installation Manual
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Also See for GNS 480:
- Installation manaul (200 pages) ,
- Pilot's manual (160 pages) ,
- Quick reference (25 pages)
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Installation Procedures
2.7.1.4 Nav I/O Connector (P7)
A navigation I/O connector, which handles VHF NAV / GPS switching, resolver and main CDI/VDI
interfaces, is located vertically on the left side of the rear panel. The NAV I/O hooks internally to the
VHF NAV board and consists a standard 37-pin D-sub connector, and has a pinout similar to the SL30
VHF NAV unit for simpler field upgrading. The pinout for the connector is defined in the following
table.
Pin #
I/O
Name
1
I
Power +
2
I
Power ground
3
O
Spare ground
4
--
RESERVED
5
--
RESERVED DB30 TxD
6
--
RESERVED
7
I
OBS_ D {S1}
8
I
Main CDI Select In
9
O
Main GS Superflag
10
O
Main CDI + Valid
11
O
Main CDI + FROM
12
O
Main CDI + TO
13
O
Main CDI + Right
14
O
Main CDI + Left
15
O
Back Course Out
16
O
OBS_ F {S4}
17
O
GPS Indicator Out
18
O
NAV Indicator Out
19
O
Composite Out
20
O
NAV Audio Ground
21
--
RESERVED
22
--
RESERVED
23
O
NAV Audio Out
24
O
OBS_H {R HI}
25
O
OBS_C {R LO}
26
I
OBS_E {S3}
27
O
Main CDI Superflag
28
O
Main GS + Valid
29
O
Main CDI - Valid
30
O
Main GS + Up
31
O
Main GS + Down
32
O
Main GS - Valid
33
O
ILS Energize
34
O
OBS_G {S2}
35
--
RESERVED
36
O
Power Control Out
37
O
Composite Ground
(see Figure 2-8 for a diagram of a 37-pin connector)
2-22
Table 2-8 NAV I/O Connector Pin-Out (P7)
Description
Main Aircraft Power Input (+10 to +36 VDC)
Main Aircraft Power Ground
No current assignment
RESERVED
RESERVED (for use with the DB30)
RESERVED
OBS Resolver input pin from channel D (COS)
Selects between GPS & VHF NAV on Main CDI Output
Glideslope Indicator Valid flag output (high-level )
Nav Valid flag output (low-level)
+ From flag output
+ To flag output
CDI + Right output
CDI + Left output
active low output when reverse sensing is engaged
OBS OBS Resolver input pin from channel F (SIN)
active low output when GPS selected on Main CDI output
active low output when VHF NAV selected on Main CDI
out
VOR/LOC composite signal
audio signal ground pin
RESERVED
RESERVED
low-level nav audio output
OBS Resolver output pin to channel H
OBS Resolver return signals C
OBS Resolver return signals E
CDI high-level Valid flag output
Nav Valid flag output (low-level )
Nav Valid flag signal ground
Glideslope + Up output
Glideslope + Down output
Glideslope Valid flag signal ground
active low output when a localizer frequency is tuned
OBS Resolver return signals G
RESERVED
power control output sinks up to 50ma when unit is on
return path for the composite signal
560-0982-01 Rev A
GNS 480 (CNX80) Installation Manual
Reference
2.8.1
2.8.10.1
2.8.2
2.8.9.1
2.8.2
2.8.7.2
2.8.2
2.8.7.1
2.8.4
2.8.13.1
2.8.13.1
2.8.2
2.8.8.1
2.8.2
2.8.8.4
2.8.4
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