17
COM Port Headers
(9-pin COM1, 2, 3, 4: see p.8, No. 11)
RESET (Reset Switch):
Connect to the reset switch on the chassis front panel. Press the reset
switch to restart the computer if the computer freezes and fails to perform a
normal restart.
PLED (System Power LED):
Connect to the power status indicator on the chassis front panel. The LED
is on when the system is operating. The LED keeps blinking when the sys-
tem is in S1/S3 sleep state. The LED is off when the system is in S4 sleep
state or powered off (S5).
HDLED (Hard Drive Activity LED):
Connect to the hard drive activity LED on the chassis front panel. The LED
is on when the hard drive is reading or writing data.
The front panel design may differ by chassis. A front panel module mainly
consists of power switch, reset switch, power LED, hard drive activity LED,
speaker and etc. When connecting your chassis front panel module to this
header, make sure the wire assignments and the pin assign-ments are
matched correctly.
PIN
Signal
Name
PIN Signal
Name PIN
Signal
Name PIN
Signal
Name
PIN Signal
Name
1
DDCD#
3
TTXD
5
GND
7
RRTS#
9
PWR
2
RRXD
4
DDTR#
6
DDSR#
8
CCTS#
2
1
* This motherboard supports RS232/422/485 on COM1, 2 ports.
Please refer to below table for the pin definition. In addition, COM1, 2
ports (RS232/422/485) can be adjusted in BIOS setup utility >
Advanced Screen > Super IO Configuration. You may refer to page
31 for details.
COM1, 2 Port Pin Definition
PIN
RS232
RS422
RS485
1
DCD
TX-
RTX-
2
RXD
TX+
RTX+
3
TXD
RX+
N/A
4
DTR
RX-
N/A
5
GND
GND
GND
6
DSR
N/A
N/A
7
RTS
N/A
N/A
8
CTS
N/A
N/A
9
PWR
PWR
PWR
