Aaeon PCM-6890 User Manual page 39

Next you may want to install external LEDs and switches to monitor
and control the mainboard. These features are completely optional.
Install them only if you need them. The front panel connector
(CN7) is an 8-pin male, dual in-line header and provides connec-
tions for a speaker, hard disk access indicator, and an input switch
for resetting the card.
Pin Signal
1 HDD LED- (Hard disk active)
2 HDD LED+ (V
3 Speaker+
4 Speaker- (GND)
5 GND
6 NC
7 Reset switch- (GND)
8 Reset switch+
The mainboard can drive an 8W external speaker at 0.5 watts. If
there is no external speaker, the PCM-6890 provides an on-board
buzzer as an alternative.
The front panel LED indicator for hard disk access is an active low
signal (24 mA sink rate).
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CC
Chapter 2 Installation 27