Garmin Apollo CNX80 Installation Manaul - page 51
Installation Procedures
GNS 480 (CNX80) Installation Manual
560-0982-01 Rev L
2-19
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.
Table 2-6. COM I/O Connector Pin-Out (P4)
Pin
#
I/O Name
Description
Reference
1
I
Aircraft Power
Main Aircraft Power Input (+10 to +36 VDC)
2.8.1
2 --
RESERVED
RESERVED
3 --
RESERVED
RESERVED
4
I
PTT
Push To Talk, Transmit Key (active low)
2.8.9.4
5 --
RESERVED
RESERVED
6
O
COM Speaker Out
Speaker output (high-level audio)
2.8.12.1
7
I
COM MIC In Low
Microphone input - analog ground
2.8.12.2
8
I
COM MIC In High
Microphone input - High
9
I
Power Ground
Main Aircraft Power Ground
2.8.1
10 -- RESERVED
RESERVED
11 -- RESERVED
RESERVED
12 -- RESERVED
RESERVED
13
O
COM Audio Ground
Speaker or Headphone output ground
2.8.12.1
14
O
COM Headphone Out
Headphone output (low-level audio)
15 -- RESERVED
RESERVED
15
9
1
8
View looking at rear of unit
Figure 2-9. 15-Pin Connector