Table 2-5. I/O Connectorp - Garmin GDL 90 Installation Manual

2.7.1.2 I/O Connector (P2)
The interface to external equipment is made through a standard male 37-pin D-sub connector near on the
rear of the unit. The pin-out for the connector is defined in the following table.
Pin # I/O Name
1 O Audio Out Hi
2 -- RESERVED
3 -- RESERVED
4 I TCAS RA Active In
5 I Audio Inhibit Input
6 -- RESERVED
7 -- Serial Ground 7
8 I Time Mark In +
9 O Time Mark Out +
10 I RS422 RxD3 +
11 O RS422 TxD3 +
12 I 429 IN 4A
13 I 429 IN 3A
14 I 429 IN 2A
15 I 429 IN 1A / RS232 RxD7
16 O 429 OUT 4A
17 O 429 OUT 3A
18 O 429 OUT 2A
19 O 429 OUT 1A
20 O Audio Out Lo
21 O Suppression Output
22 I TCAS Operational In
23 I Air/Ground In
24 -- Serial Ground 6
25 O UAT Fail Out
26 -- RESERVED
27 -- RESERVED
28 I RS422 RxD3 -
29 O RS422 TxD3 -
30 I 429 IN 4B
31 I 429 IN 3B
32 I 429 IN 2B
33 I 429 IN 1B / RS232 RxD6
34 O 429 OUT 4B
35 O 429 OUT 3B
36 O 429 OUT 2B
37 O 429 OUT 1B
GDL 90 Installation Manual
Table 2-5. I/O Connector Pin-Out (P2)
Description
Low-Level Audio Out (to audio panel)
RESERVED
RESERVED
TCAS Resolution Advisory Active Discrete In (active low)
Inhibit Audio Alerts (active low)
RESERVED
RS232 signal ground
GPS 1 Pulse Per Second Input + (RS422 Level)
GPS 1 Pulse Per Second Output + (RS422 Level)
RS422 channel 3 serial data input +
RS422 channel 3 serial data output +
ARINC 429 In Channel 4A
ARINC 429 Input Channel 3A
ARINC 429 Input Channel 2A
ARINC 429 In Channel 1A / RS232 Channel 7 serial data in
ARINC 429 Output Channel 4A
ARINC 429 Output Channel 3A
ARINC 429 Output Channel 2A
ARINC 429 Output Channel 1A
Audio signal ground
Suppression Output (active high)
TCAS Operational Discrete Input (active low)
Air / Ground Discrete Input (level-configurable)
RS232 signal ground
UAT Fail Output (active low)
RESERVED
RESERVED
RS422 channel 3 serial data input -
RS422 channel 3 serial data output -
ARINC 429 Input Channel 4B
ARINC 429 Input Channel 3B
ARINC 429 Input Channel 2B
ARINC 429 In Channel 1B / RS232 Channel 6 serial data in
ARINC 429 Output Channel 4B
ARINC 429 Output Channel 3B
ARINC 429 Output Channel 2B
ARINC 429 Output Channel 1B
1
20
VIEW LOOKING AT REAR OF UNIT
Figure 2-10. 37-pin Connector
560-1049-00 Rev B
Installation Procedures
19
37
2-13