Com (Serial) Ports - DFI CS636-C246 User Manual

Rear I/O Ports
X

COM (Serial) ports

COM 1 (DB9)
COM 2 (DB9)
9 1
2
„ Internal Ports COM 3-6
(from left to right)
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 1 (Rear Port) and COM 3 (Internal Port) support three serial modes, i.e. RS232, RS422,
and RS485. COM 2 (Rear Port) and COM 4 - 6 (Internal Ports) support only RS232 as summa-
rized in the table below. Serial modes of all the COM ports are configured via BIOS settings as
instructed in the BIOS chapter.
„ COM Port's Serial Mode Availability
COM Port RS232
1 O
2 O
3 O
4 O
5 O
6 O
User's Manual | CS636
RS422 RS485
O O
X X
O O
X X
X X
X X
The pin assignment of each mode mentioned above is listed below.
„ COM Port Pin Assignment
RS232 Standard RS232 with +5V/+12V
Pin DB9 Box header DB9
1 DCD DCD DCD
2 SIN DSR SIN
3 SOUT SIN SOUT
4 DTR RTS DTR
5 GND SOUT GND
6 DSR CTS DSR
7 RTS DTR RTS
8 CTS RI CTS
9 RI GND +5V/+12V
When set to RS232, power supply modes — standard RS232, RS232 with +5V, or RS232 +12V —
can be configured via jumper settings as instructed in previous sections in this chapter.
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 COM ports in the Advanced menu ("NCT6116D Super IO Configuration" >
"Serial Port Configuration") on the BIOS. Refer to the chapter 3 for more information.
Jumper Setting
RS232 with or without power can be configured via jumper settings as previously instructed in
the RS232 Power Select section.
Chapter 2
HARDWARE INSTALLATION
RS422 RS485
Box
Box header DB9 DB9
header
DCD TX- TX- D-
DSR TX+ N.C. D+
SIN RX+ TX+ N.C.
RTS RX- N.C. N.C.
SOUT GND RX+ GND
CTS N.C. N.C. N.C.
DTR N.C. RX- N.C.
+5V/+12V N.C. N.C. N.C.
GND N.C. GND N.C.
Box
header
D-
N.C.
D+
N.C.
N.C.
N.C.
N.C.
N.C.
GND
18