Com (Serial) Ports; Front Panel Connector - DFI SU551 User Manual

COM (Serial) Ports

COM 3/COM 4: COM 1/COM 2:
RS232 RS232/422/485
20 19
COM 1 COM 2
2 1 COM 3 COM 4
COM 1 and COM 2 can be selected among RS232, 422 and 485. COM 3 and COM 4 are fixed
at RS232. Configure COM 1 and COM 2 serial communication mode in the BIOS (the "SIO NU-
TOTON6106D" submenu of the Advanced menu). The serial ports are asynchronous commu-
nication ports with 16C550A-compatible UARTs that can be used with modems, serial printers,
remote display terminals, and other serial devices.
Connecting External Serial Ports
The COM ports may be 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 "Super IO Configuration" (SIO NUVOTON6106D) sub-
menu of the Advanced menu in the BIOS. Refer to Chapter 3 for more information.
COM Port Connector
Pins
1
2
3
4
5
6
7
8
9
10
Chapter 2 Hardware Installation
Chapter 2
Function Pins Function
DCD_1 DCD_2
11
DSR_1 DSR_2
12
RD_1 RD_2
13
RTS_1 RTS_2
14
TD_1 TD_2
15
CTS_1 CTS_2
16
DTR_1 DTR_2
17
RI_1 RI_2
18
GND GND
19
GND GND
20

Front Panel Connector

HDD-LED - HDD LED
This LED will be lit when the hard drive is being accessed.
RESET-SW - Reset Switch
This switch allows you to reboot without having to power off the system.
PWR-BTN - Power Switch
This switch is used to power on or off the system.
PWR-LED - Power/Standby LED
When the system's power is on, this LED will be lit. When the system is in the S1 (POS - Pow-
er On Suspend) state, it will blink every second. When the system is in the S3 (STR - Suspend
To RAM) state, it will blink every 4 seconds.
Pin Pin Assignment
6 HDD Power
HDD-LED
4
SUS_LED
3 Ground
RESET-SW
5 RST Signal
17
Front
Panel
5
6
HDD_LED
Reset Button
Power Button
Power_LED
2 1
Pin Pin Assignment
1 Power Button
PWR Button
3 Ground
2 LED Power
PWR LED
4
SUS_LED
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