Acer EL1800 Technical Information download pdf (Page 69)

Front Panel Header

The front panel header (PANEL1) provides a standard set of switch and LED headers commonly found on

ATX or Micro ATX cases. Refer to the table below for information:

Pin Signal Name Function Pin Signal Name Function

1 HD_LED_P Hard disk LED(+) 2 FP PWR/SLP *MSG LED(+)

3 HD_LED_N Hard disk LED(-) 4 FP PWR/SLP *MSG LED(-)

5 RST_SW_N Reset Switch(-) 6 PWR_SW_P Power Switch(+)

7 RST_SW_P Reset Switch(+) 8 PWR_SW_N Power Switch(-)

9 RSVD Reserved 10 Key No pin

11 RSVD Reserved 12 LAN LED LAN LED (+)

13 RSVD Reserved 14 LAN LED LAN LED (-)

*.MSG LED (dual color or single color)

Hard Drive Activity LED

Connecting pins 1 and 3 to a front panel mounted LED provides visual indication that data is being read from

or written to the hard drive. For the LED to function properly, an IDE drive should be connected to the onboard

IDE interface. The LED will also show activity for devices connected to the SCSI (hard drive activity LED)

connector.

Power/Sleep/Message waiting LED

Connecting pins 2 and 4 to a single or dual-color, front panel mounted LED provides power on/off, sleep, and

message waiting indication.

Reset Switch

Supporting the reset function requires connecting pin 5 and 7 to a momentarycontact switch that is normally

open. When the switch is closed, the board resets and runs POST.

Power Switch

Supporting the power on/off function requires connecting pins 6 and 8 to a momentary-contact switch that is

normally open. The switch should maintain contact for at least 50 ms to signal the power supply to switch on

or off. The time requirement is due to internal de-bounce circuitry. After receiving a power on/off signal, at

least two seconds elapses before the power supply recognizes another on/off signal.

LAN LED

Connecting pins 12 and 14 to a single or dual-color LAN LED provides messages waiting indication.

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Acer EL1800 Technical Information Page 69