2-25
Chapter 2: Motherboard information
11. Serial Port headers (10-1 pin COM2~COM6)
These headers are for serial (COM) ports. Connect the serial port module
cable to this header, then install the module to a slot opening at the back of
the system chassis.
NOTE:
• The COM module is purchased separately.
• COM1 also supports RS-232 / RS-422 / RS-485. See the table below and
section
3.3.7 SIO Configuration
for details.
DDCD2#
TTXD2
GND
RRTS2#
RRI2#
COM2
A
PIN 1
A
B
C
D
E
RRXD2 DDTR2# DDSR2# CCTS2#
DDCD3 DTXD3
GND
DRTS3
DRI3
COM3
B
PIN 1
DRXD3 DDTR3 DDSR3 DCTS3
DDCD5 DTXD5
GND
DRTS5
DRI5
COM5
D
PIN 1
DRXD5 DDTR5 DDSR5 DCTS5
DDCD6 DTXD6
GND
DRTS6
DRI6
COM6
E
PIN 1
DRXD6 DDTR6 DDSR6 DCTS6
DDCD4 DTXD4
GND
DRTS4
DRI4
COM4
C
PIN 1
DRXD4 DDTR4 DDSR4 DCTS4
Pin
Signal
Signal
Pin
Pin
Signal
1
DCD# (422TXD-/485DATA-) 2
RXD (/)
3
TXD ()
4
DTR# (422RXD-)
5
GND
6
DSR#
7
RTS#
8
CTS#
9
RI/+5V/+12V
10
N.C.
