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18 Apollo SL40 Installation Manual
REAR CONNECTOR PINOUT
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
18
915
Viewed from rear of unit