User’s Manual

1-4
10. Chassis Intrusion header
This header is for a chassis-mounted intrusion detection sensor or switch.
Connect one end of the chassis intrusion sensor or switch cable to this
header. The chassis intrusion sensor or switch sends a high-level signal to this
header when a chassis component is removed or replaced. The signal is then
generated as a chassis intrusion event.
11. Clear CMOS header
The Clear CMOS header allows you to clear the Real Time Clock (RTC) RAM
in the CMOS, which contains the date, time, system passwords, and system
setup parameters.
To erase the RTC RAM:
1. Turn OFF the computer and unplug the power cord.
2. Short-circuit pin 1-2 with a metal object or jumper cap for about 5-10 seconds.
3. Plug the power cord and turn ON the computer.
4. Hold down the <Del> key during the boot process and enter BIOS setup to
re-enter data.
DO NOT short-circuit the pins except when clearing the RTC RAM. Short-circuiting or
placing a jumper cap will cause system boot failure!
If the steps above do not help, remove the onboard battery and short the two pins again to
clear the CMOS RTC RAM data. After clearing the CMOS, reinstall the battery.
12. COM Port header
The COM (Serial) Port header allows you to connect a COM port module.
Connect the COM port module cable to this header, then install the module to a
slot opening on the system chassis.
The COM port module is purchased separately.
13. Front Panel Audio header
The Front Panel Audio header is for a chassis-mounted front panel audio
I/O module that supports HD Audio. Connect one end of the front panel
audio I/O module cable to this header.
We recommend that you connect a high-definition front panel audio
module to this header to avail of the motherboard’s high-definition
audio capability.
+5VSB_MB
Chassis Signal
GND
CHASSIS
PIN 1
CLRTC
+3V_BAT GND
PIN 1
PIN 1
RXD
DTR
DSR
CTS
COM
DCD
TXD
GND
RTS
RI
AAFP
AGND NC SENSE1_RETUR SENSE2_RETUR
PORT1 L
PORT1 R PORT2 R
SENSE_SEND
PORT2 L
HD-audio-compliant
pin definition
VBUS
TX1+
TX1-
GND
RX1+
RX1-
VBUS
CC1
NC
NC
CC2
D+
D-
GND
RX2-
RX2+
GND
TX2-
TX2+
VBUS
Chapter 1: Product Introduction