Installation Procedures
2-20 560-0982-01 Rev L GNS 480 (CNX80) Installation Manual
2.7.1.3 I/O Expansion Connector (P5)
Additional I/O for the GNS 480 is achieved via the I/O expansion connector, which consists of a high
density female 78-pin D-sub connector near the bottom of the unit. The pinout for the connector is defined
in the following table.
Table 2-7. I/O Expansion Connector Pin-Out (P5)
Pin # I/O Name Description Reference
1 I RS-232 RxD5 RS-232 channel 5 serial data input 2.8.10.1
2 I RS-232 RxD6 RS-232 channel 6 serial data input (opto-isolated)
3 -- RESERVED RESERVED
4 O 429 OUT 1A ARINC 429 Output Channel 1A 2.8.10.2
5 O 429 OUT 2A ARINC 429 Output Channel 2A
6 -- RESERVED RESERVED
7 I 429 IN 1A ARINC 429 Input Channel 1A 2.8.10.2
8 I 429 IN 2A ARINC 429 Input Channel 2A
9 I 429 IN 3A ARINC 429 Input Channel 3A
10 I RS-232 RxD7 RS-232 channel 7 serial data input (receive-only channel) 2.8.10.1
11 -- RESERVED RESERVED
12 -- RESERVED RESERVED
13 I Baro In (W) Baro Correction Input (wiper) 2.8.5
14 I/O DME Clock Bus Digital Serial DME Clock Bus 2.8.16
15 I/O DME Data Bus Digital Serial DME Data Bus
16 O OBI Clock Digital OBI Clock 2.8.15.1
17 O OBI Data Digital OBI Data
18 I Hdg Synchro Y Heading Synchro Input (Y) 2.8.6
19 I Hdg Synchro X Heading Synchro Input (X)
20 I Hdg Synchro Ref Hi Heading Synchro Reference In (Hi)
21 O RS-232 TxD5 RS-232 channel 5 serial data output 2.8.10.1
22 O RS-232 TxD6 RS-232 channel 6 serial data output (opto-isolated)
23 -- RESERVED RESERVED
24 O 429 OUT 1B ARINC 429 Output Channel 1B 2.8.10.2
25 O 429 OUT 2B ARINC 429 Output Channel 2B
26 -- RESERVED RESERVED
27 I 429 IN 1B ARINC 429 Input Channel 1B 2.8.10.2
28 I 429 IN 2B ARINC 429 Input Channel 2B
29 I 429 IN 3B ARINC 429 Input Channel 3B
30 I RS-232 RxD8 RS-232 channel 8 serial data input (receive-only channel) 2.8.10.1
31 -- RESERVED RESERVED
32 -- RESERVED RESERVED
33 O Baro Hi Baro Correction Excitation Output 2.8.5
34 I DME Select In Digital Serial DME Select (active low) 2.8.16
35 I DME Channel Req Digital Serial DME Channel Request (RNAV)
36 I OBI Select In RMI Selection input (Open = GPS, GND = NAV) 2.8.15.2
37 O OBI Sync Digital OBI Sync Pulse 2.8.15.1
38 I Hdg Synchro Z Heading Synchro Input (Z) 2.8.6
39 I Hdg Synchro Ref Lo Heading Synchro Reference In (Lo)
40 O Message Audio Out Low Level Message Audio Out (to audio panel) 2.8.14.1
41 O Serial Ground 5 RS-232 signal ground 2.8.10.1
42 O Serial Ground 6 RS-232 signal ground
43 O Message Audio Gnd Message Audio ground signal (or spare ground) 2.8.14.1
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