Onnector, Inout – Garmin SL40 User Manual
Page 24
Specifications
18
Apollo SL40 Installation Manual
R
EAR
C
ONNECTOR
P
INOUT
Table 2 Connector Pinout
Pin # I/O Connection
Function
1
I
Power +
main DC power input
2
I
Reserved
Do not connect
3
O
TxD
RS232 serial data output
4
I
TxKey
transmit enable key, pulled low to transmit
5
--
NC
Do not connect
6
O
Speaker
speaker terminal output
7
I
Mic ground
microphone input ground connection
8
I
Mic 1
microphone input #1
9
I
Power ground
main power ground input
10
I
RxD
RS232 serial data input
11
O
Serial ground
RS232 signal ground
12
I
Intercom select
intercom function select, pulled low to turn on the intercom
function
13
O
Audio ground
speaker and headphone ground connection
14
O
Headphone
headphone terminal output
15
I
Mic 2
microphone input #2
1
8
9
15
Viewed from rear of unit