MATSONIC MS9127C User Manual page 29

SPDIFO1: SPDIF out header
You can purchase an optional 24-bit digital audio extension bracket from a
third-party vendor. You can use the audio RCA jacks to connect to digital audio
devices. If your CD-ROM/DVD drive has digital audio output, you can connect
it to the input pins of the SPDIF connector.
Pin Signal Name
1 SPDIF
2 +5VA
3 NC
4 GND
Function
SPDIF digital output
5V analog power
Not connected
Ground
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