Asus M3N-HD - Manual (Page 59)

ASUS M3N-HD/HDMI 2-33
10. Optical drive audio connector (4-pin CD)
These connectors allow you to receive stereo audio input from sound sources
such as a CD-ROM, TV tuner, or MPEG card.
M3N-HD/HDMI
®
CD
Left Audio Channel
GND
GND
Right Audio Channel
M3N-HD/HDMI Internal audio connector
11. Serial port connector (10-1 pin COM1)
This connector is for a serial (COM) port. Connect the serial port module
cable to this connector, then install the module to a slot opening at the back
of the system chassis.
The COM module is purchased separately.
M3N-HD/HDMI
®
M3N-HD/HDMI Serial port (COM1) connector
COM1