Chapter 2 Installation 27
Thermal Alarm LED (CN3)
Like CN2, the Thermal Alarm LED connector (CN3) allows the user
to connect an alarm indicator light on the case.
Thermal Alarm LED Connector (CN3)
Pin
Signal
1
Alarm
2
GND
Power LED & Keylock Connector (CN4)
You can use a switch (or a lock) to disable the keyboard so that the
PC will not respond to any input. This is useful if you do not want
anyone to change or stop a running program. Connect the switch
between Pins 4 and 5 to lock the keyboard.
Power LED & Keylock Connector (CN4)
Pin
Signal
1
Power LED (VCC
)
2
NC
3
GND
4
Keylock (IRQ1)
5
GND
Fan Connector (CN5)
Provides power supply to optional CPU cooling fan.
Fan power connector
Pin
Signal
1
+12 V
2
FAN_ON
3
+5V
Содержание SBC-598
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