Aaeon PCM-6890B, User Manual

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26 PCM-6890B User Manual
Front panel connector (CN7)
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.
Front panel connector (CN7)
Pin Signal
1 HDD LED- (Hard disk active)
2 HDD LED+ (V
CC
)
3
4 Speaker- (GND)
5 GND
6 NC
7 Reset switch- (GND)
8 Reset
Speaker
The mainboard can drive an 8
Ω
external speaker at 0.5 watts. If
there is no external speaker, the PCM-6890B provides an onboard
buzzer as an alternative.
LED interface
The front panel LED indicator for hard disk access is an active low
signal (24 mA sink rate).