Garmin GNC 420AW Installation Manual - page 56
Page 4-2
GNS 400W Series Installation Manual
Rev. G
190-00356-08
Pin
Pin Name
I/O
Standard Function [1]
Alternate Function [1]
40
LIGHTING BUS LO
In
41
GPS RS-232 OUT 3
Out
42
GPS RS-232 IN 3
In
43
MAIN OBI CLOCK
RESERVED
Out
44
MAIN OBI DATA
HTAWS AUDIO ACTIVE
Out
45
MAIN OBI SYNC
RESERVED
Out
46
GPS ARINC 429 OUT A
Out
47
GPS ARINC 429 OUT B
Out
48
GPS ARINC 429 IN 1 A
In
49
GPS ARINC 429 IN 1 B
In
50
GPS ARINC 429 IN 2 A
In
51
GPS ARINC 429 IN 2 B
In
52
RESERVED
--
53
RESERVED
--
54
GPS RS-232 OUT 4
Out
55
GPS RS-232 IN 4
In
56
GPS RS-232 OUT 1
Out
57
GPS RS-232 IN 1
In
58
GPS RS-232 OUT 2
Out
59
GPS RS-232 IN 2
In
60
ALTITUDE COMMON (GROUND)
Out
61
ALTITUDE C4 [2]
REDUCED PROTECTION (RP MODE)
In
62
ALTITUDE C2 [2]
AURAL SUPPRESSION
In
63
ALTITUDE C1 [2]
TERRAIN INHIBIT
In
64
ALTITUDE B4 [2]
HTAWS AUDIO INHIBIT
In
65
ALTITUDE B2 [2]
RESERVED
In
66
ALTITUDE B1 [2]
RESERVED
In
67
ALTITUDE A4 [2]
RESERVED
In
68
ALTITUDE A2 [2]
RESERVED
In
69
ALTITUDE A1 [2]
RESERVED
In
70
ALTITUDE D4 [2]
AIR/GROUND [3]
In
71
OBS MODE SELECT
In
72
AIRCRAFT POWER 2
In
73
CDI SOURCE SELECT
In
74
COM REMOTE RECALL
In
75
DEMO MODE SELECT
In
76
RESERVED
--
77
AIRCRAFT GROUND
--
78
AIRCRAFT GROUND
--
[1]
When the airframe is configured for helicopter (see Section 5.3.3) and HTAWS is enabled, the
alternate functions are available, and the standard I/O functions on those pins are not available.
[2]
The altitude input is not available when the airframe is configured for helicopter.
[3]
When the airframe is configured for helicopter, the Air/Ground input is available and can be
enabled or disabled. See Section 5.3.3.