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Chapter 5 Ports and Connectors
Chapter 5
COM (Serial) Ports
The pin functions of COM port 1 and COM port 2 will vary according to jumpers’ settings.
These jumpers allow you to configure the Serial COM ports to RS232, RS422 (Full Duplex) or
RS485. Refer to “COM 1/COM 2 RS232/422/485 Select” and “COM 1/COM 2 RS232/Power Se-
lect“ in chapter 4 for more information.
The serial ports are asynchronous communication ports with 16C550A-compatible UARTs that
can be used with modems, serial printers, remote display terminals, and other serial devices.
Connecting External Serial Ports
Your COM port may come mounted on a card-edge bracket. Install the card-edge bracket to
an available slot at the rear of the system chassis then insert the serial port cable to the COM
connector. Make sure the colored stripe on the ribbon cable is aligned with pin 1 of the COM
connector.
• BIOS
Setting
Configure the serial ports in the Advanced menu (“Super IO Configuration” submenu) of the
BIOS. Refer to chapter 7 for more information.
2
1
9
COM 2:
RS232/422/485
COM 1:
RS232/422/485
1-3, 2-4 On:
RS232 (default)
3-5, 4-6 On:
RS422 Full Duplex/RS485
JP13 (for COM 1)/JP17 (for COM 2)
RS485
COM 2
1-2 On: RS232
(default)
1 3
5
2
4 6
RS422
Full Duplex
3-4 On: RS422
Full Duplex
5-6 On: RS485
RS232
2
1
9
RXD
DCD- TXD
D
TR
-
GND
DSR
-
RT
S-
CTS-
RI
-
2
1
9
RXD-
RXD+ TXD+
TXD-
NC.
NC.
NC.
NC.
NC.
2
1
9
D
ATA
-
D
ATA
+
TXD
NC.
NC.
NC.
NC.
NC.
NC.
JP8 and JP11 (for COM 1)/JP12 and JP15 (for COM 2)
Note:
When COM 1 RS232/422/485 is selected, JP8 and JP11 must be set in accordance to
JP13. And when COM 2 RS232/422/485 is selected, JP12 and JP15 must be set in ac-
cordante to JP17.
COM 1
RS485
RS422
Full Duplex
RS232
DCD-
TD
RD
DT
R-
GND
1 2 3 4 5
RT
S-
RI
-
DSR
-
CTS-
6 7 8 9
N.C. N.C. N.C. N.C.
6 7 8 9
D
ATA
+
D
ATA
-
1 2 3 4 5
N.C.
N.C.
N.C.
RXD+
TXD+
RXD-
TXD- N.C.
1 2 3 4 5
6 7 8 9
N.C. N.C. N.C. N.C.
1 3
5
2
4 6
1 3
5
2
4 6
1 3
5
2
4 6
1 3
5
2
4 6