Asus B15OM-D Manual page 13

Digital audio connector (4-1 pin SPDIF_OUT)
Connect the S/PDIF Out module cable to this connector, then
install the module to a slot opening at the back of the system
chassis.
Serial port connector (10-1 pin COM)
Connect the serial port module cable to this connector, then install the module to a
slot opening at the back of the system chassis.
Front panel audio connector (10-1 pin AAFP)
This connector is for a chassis-mounted front panel audio I/O module that supports
either HD Audio or legacy AC`97 audio standard. Connect one end of the front
panel audio I/O module cable to this connector.
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PCI slot
The PCI slot supports cards such as a LAN card, SCSI card, USB card, and other
cards that comply with PCI specifications
PCI Express 3.0/2.0 x1 slots
This motherboard has two PCI Express 3.0/2.0 x1 slots that support PCI Express
x1 network cards, SCSI cards, and other cards that comply with the PCI Express
specifications
PCI Express 3.0/2.0 x16 slot
This PCI Express 3.0/2.0 x16 slot supports PCI Express 3.0/2.0 x16 graphic cards
complying with the PCI Express specifications
Chapter 1: Product introduction
We recommend that you connect a high-definition front panel audio module to this
connector to avail of the motherboard's high-definition audio capability.
If you want to connect a high-definition front panel audio module to this connector,
set the Front Panel Type item in the BIOS setup to [HD Audio]. If you want to
connect an AC'97 front panel audio module to this connector, set the item to
[AC97]. By default, this connector is set to [HD Audio].
PIN 1
SPDIF_OUT
1-4