Front Panel Connector; Smbus Connector - DFI DT122-BE User Manual

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
PWR-LED
7 Ground
9 RST Signal
RESET-SW
PWR-BTN
11 N.C.
Chapter 5 Ports and Connectors
Chapter 5
1 2
Front
Panel
PWR-LED
HDD-LED
PWR-BTN
RESET-SW
11 12
Pin Pin Assignment
2 LED Power
4 LED Power
6 Signal
8 Ground
10 Signal

SMBus Connector

SMBUS Data
NC
GND
2 6
1 5
SMBus
+3.3V_standby
SMBUS_Alert
SMBUS Clock
The SMBus (System Management Bus) connector is used to connect SMBus devices. It is a
multiple device bus that allows multiple chips to connect to the same bus and enable each one
to act as a master by initiating data transfer.
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