Com (Serial) Ports; Front Panel Connector - DFI BT551 User Manual

COM (Serial) Ports

COM 1/COM 2:
RS232
2
1 9
COM 1
COM 2
COM 3
COM 3: RS485
2
1
9
COM 1 and COM 2 are fixed at RS232. COM 3 is fixed at RS485.
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 COM ports in the Advanced menu ("Super IO Configuration" submenu) of
the BIOS. Refer to the chapter 3 for more information.
Chapter 2 Hardware Installation
Chapter 2

Front Panel Connector

HDD-LED - HDD LED
This LED will light 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 light. When the system is in the S1 (POS - Power
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
3 HDD Power
HDD-LED
5 Signal
7 Ground
9 RST Signal
RESET-SW
11 N.C.
19
HDD-LED
RESET-SW
11 1
12
2
Front
Panel
PWR-LED
PWR-BTN
Pin Pin Assignment
2 LED Power
PWR-LED 4 LED Power
6 Signal
8 Ground
PWR-BTN
10 Signal
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