Garmin GNS 480, Installation Manaul

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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