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User's Manual | CS631
Chapter 2
HARDWARE INSTALLATION
X
Internal I/O Connectors
COM (Serial) Port
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.
COM 2 supports three serial modes, i.e. RS232, RS422, and RS485 as well as RS232 with/with-
out power. COM 3/4/5/6 only support RS232.
Jumper Setting
Serial mode and RS232 with/without power of COM 2 are configured via jumper settings as
previously instructed in this chapter.
BIOS Setting
Configure the onboard COM ports in the Advanced menu (“Console Redirection” and "SIO NU-
VOTON6116D" submenus) of the BIOS. Refer to chapter 3 for more information.
Pin
Standard
RS232
RS232 with
Power (COM 2)
RS422
(COM 2)
RS485
(COM 2)
1
DCD-
+12V
TXD-
Data-
2
RD
RD
TXD+
Data+
3
TD
TD
RXD+
N.C.
4
DTR-
DTR-
RXD-
N.C.
5
GND
GND
GND
GND
6
DSR-
DSR-
N.C.
N.C.
7
RTS-
RTS-
N.C.
N.C.
8
CTS-
CTS-
N.C.
N.C.
9
RI-
+5V
N.C.
N.C.
COM Port Pin Assignment
COM Port Pin Headers
COM 2/3/4/5/6 from left to right
1
9
2
