Chapter 2 Connecting Peripherals 15
Reset Switch (CN1)
You can connect an external switch to easily reset your computer.
This switch restarts your computer as if you had turned off the
power, then turned it back on.
Hard Drive LED (CN2)
You can connect a LED to connector CN2 to indicate when the
HDD is active. Marks on the circuit board indicate LED polarity.
IrDA Tx/Rx Header (CN3)
This connector supports the optional wireless transmitting and
receiving infrared module. This module mounts onto a small
opening on system cases that support this feature. You must also
configure the setting through BIOS setup to select whether UART2
is directed for use with COM2 or IrDA.
IrDA Tx/Rx header (CN3)
Pin
Function
1
+5 V
2
No Connection
3
Rx
4
GND
5
Tx
External Speaker (CN4)
The CPU card has its own buzzer. You can also connect to the
external speaker on you computer chassis. Pin assignments for
CN4 are shown below:
External speaker (CN4)
Pin
Function
1
Speaker out
2
No Connection
3
GND
4
+5 VDC
