Onnector P In -O Ut (P4) - Garmin GNS 480 Installation Manaul

2.7.1.2 COM I/O Connector (P4)
The GNS 480 communication interface is handled via a standard density male 15-pin D-sub connector
located at the top of the unit. Internally this connection is on the VHF COM board. The pinout for the
connector is defined in the following table.
Pin I/O Name
#
1 I Aircraft Power
2 -- RESERVED
3 -- RESERVED
4 I PTT
5 -- RESERVED
6 O COM Speaker Out
7 I COM MIC In Low
8 I COM MIC In High
9 I Power Ground
10 -- RESERVED
11 -- RESERVED
12 -- RESERVED
13 O COM Audio Ground
14 O COM Headphone Out
15 -- RESERVED
GNS 480 (CNX80) Installation Manual
Table 2-6. COM I/O Connector Pin-Out (P4)
Description
Main Aircraft Power Input (+10 to +36 VDC)
RESERVED
RESERVED
Push To Talk, Transmit Key (active low)
RESERVED
Speaker output (high-level audio)
Microphone input - analog ground
Microphone input - High
Main Aircraft Power Ground
RESERVED
RESERVED
RESERVED
Speaker or Headphone output ground
Headphone output (low-level audio)
RESERVED
1
9
View looking at rear of unit
Figure 2-9. 15-Pin Connector
560-0982-01 Rev L
Installation Procedures
8
15
Reference
2.8.1
2.8.9.4
2.8.12.1
2.8.12.2
2.8.1
2.8.12.1
2-19