Sony SRX-R515P Installation Manual page 49

AUDIO CTRL: D-sub 9 pin
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Pin No. Signal name
1 DCD
2 RXD
3 TXD
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9 RI
* Connect to Audio Processor manufactured by Dolby.
SRX-R515P
4-5 (E)