Sony PCV-RX460 - Manual (Page 75)

System Board 61
Serial Port, Headphones, Line In, and Mic Connectors
The serial connector is a DB-9 male connector. The headphones, line in,
and mic jacks are stereo mini-jacks (3.5 mm). The headphones jack
connects to headphones. The line in jack connects to a stereo audio source
(not an audio source from a video device). The mic jack connects to a
microphone.
Serial connector
Pin Signal Name
1 DCD
2 RXD
3 TXD
4 DTR
5 LOGIC GND
6 DSR
7 RTS
8 CTS
9 RI
Serial
1 5
6 9
Headphones
Line In
Mic