Table 2-5 Main Systemc; Figure 2-8 - 37-Pin Connector - Garmin GNS 480 Installation Manual

2.7.1.1 Main System Connector (P1)
The interface to external equipment is made through a standard male 37-pin D-sub connector near the
middle of the unit. The pin-out for the connector is defined in the following table.
Pin # I/O Name
1 I Power +
2 I Power Ground
3 O Serial Ground 2
4 I RS232 RxD1
5 O RS232 TxD1
6 O RS232 TxD3
7 I RS232 RxD3
8 O RS422 TxD4 +
9 -- RESERVED
10 O RS422 TxD4 -
11 I RS422 RxD4 +
12 -- RESERVED
13 -- RESERVED
14 I Com Flip Flop In
15 I UP Discrete In
16 I Power +
17 O Time Mark Out +
18 -- RESERVED
19 O Time Mark Out -
20 I Power Ground
21 I RS232 RxD2
22 O RS232 TxD2
23 O Serial Ground 1
24 -- RESERVED
25 O Serial Ground 3
26 I RS422 RxD4 -
27 -- RESERVED
28 -- RESERVED
29 -- RESERVED
30 -- RESERVED
31 -- RESERVED
32 -- RESERVED
33 I DOWN Discrete In
34 I VOR Flip Flop In
35 I Power + Out (Nav)
36 -- RESERVED
37 I Power Gnd Out (Nav)
GNS 480 (CNX80) Installation Manual560-0982-01 Rev A
Table 2-5 Main System Connector Pin-Out (P1)
Description
Main Aircraft Power Input (+10 to +36 VDC)
Main Aircraft Power Ground
RS232 signal ground
RS232 channel 1 serial data input
RS232 channel 1 serial data output
RS232 channel 3 serial data output
RS232 channel 3 serial data input
RS422 channel 4 serial data output +
RESERVED
RS422 channel 4 serial data output -
RS422 channel 4 serial data input +
RESERVED
RESERVED
COM Flip-Flop discrete input (active low)
Activate COM User list and scrolls up (active low)
Main Aircraft Power Input (+10 to +36 VDC)
GPS 1 Pulse Per Second Output + (RS422 Level)
RESERVED
GPS 1 Pulse Per Second Output - (RS422 Level)
Main Aircraft Power Ground
RS232 channel 2 serial data input
RS232 channel 2 serial data output
RS232 signal ground
RESERVED
RS232 signal ground
RS422 channel 4 serial data input -
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
Activate COM User list and scrolls down (active low)
VOR Flip-Flop discrete input (active low)
Main Power Output for Nav Receiver
RESERVED
Main Power Ground Output for Nav Receiver
37
19
VIEW LOOKING AT REAR OF UNIT

Figure 2-8 - 37-pin Connector

Installation Procedures
20
1
Reference
2.8.1
2.8.10.1
2.8.10.1
2.8.9.2
2.8.9.5
2.8.1
2.8.11
2.8.11
2.8.1
2.8.10.1
2.8.10.1
2.8.9.5
2.8.9.3
2.8.1
2.8.1
2-17