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19
Chapter 5
Chapter 5 Ports and Connectors
Chapter 5
COM (Serial) Ports
COM 1 and COM 2 can be selected among RS232, RS422 and RS485. COM 3 and COM 4
are fixed at RS232.
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.
BIOS Setting
Configure the serial COM ports including the communication mode in the Advanced menu
(“Super IO Configuration” submenu) of the BIOS. Refer to Chapter 7 for more information.
Pins
RS-232
RS-422 RS-485
1
DCD_1
TD_1
RD_1
2
DSR_1
---
---
3
RD_1
DTR_1
DCD_1
4
RTS_1
---
---
5
TD_1
DCD_1
---
6
CTS_1
---
---
7
DTR_1
RD_1
---
8
RI_1
---
---
9
GND
GND
GND
10
GND
---
---
11
DCD_2
TD_2
RD_2
12
DSR_2
---
---
13
RD_2
DTR_2
DCD_2
14
RTS_2
---
---
15
TD_2
DCD_2
---
16
CTS_2
---
---
17
DTR_2
RD_2
---
18
RI_2
---
---
19
GND
GND
GND
20
GND
---
---
1
1
ON
2
COM 1
COM 2
COM 3
COM 4
RS232
1 2 3 4 5
6 7 8 9
DCD
TXD
RXD
DT
R
GND
RT
S
RI
DSR
CTS
RS422
Full Duplex
RXD+
TXD+
RXD-
TXD- N.C.
1 2 3 4 5
6 7 8 9
N.C. N.C. N.C. N.C.
RS485
D
ATA
+
D
ATA
-
N.C.
N.C.
N.C.
1 2 3 4 5
N.C. N.C. N.C. N.C.
6 7 8 9
COM 1
(RS232/422/485)
COM 2
(RS232/422/485)
20
19
1
2
RS232
