Rear Connector Pinout; Table 2 Connector Pinout - Garmin Apollo SL40 Installation Manual

Specifications
R C
EAR ONNECTOR
Pin # I/O Connection
1 I Power +
2 I Reserved
3 O TxD
4 I TxKey
5 -- NC
6 O Speaker
7 I Mic ground
8 I Mic 1
9 I Power ground
10 I RxD
11 O Serial ground
12 I Intercom select
13 O Audio ground
14 O Headphone
15 I Mic 2
18
P
INOUT

Table 2 Connector Pinout

Function
main DC power input
Do not connect
RS232 serial data output
transmit enable key, pulled low to transmit
Do not connect
speaker terminal output
microphone input ground connection
microphone input #1
main power ground input
RS232 serial data input
RS232 signal ground
intercom function select, pulled low to turn on the intercom
function
speaker and headphone ground connection
headphone terminal output
microphone input #2
1
9
Viewed from rear of unit
8
15
Apollo SL40 Installation Manual