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User's Manual | CS631
Chapter 2
HARDWARE INSTALLATION
The 8-bit Digital I/O (DIO) connector allows for input/output signals of digital logical states de-
fined by voltage levels.
Pin
Assignment
Pin
Assignment
1
GND
2
+12V
3
DIO_7
4
+12V
5
DIO_6
6
GND
7
DIO_5
8
+5V
9
DIO_4
10
+5V
11
DIO_3
12
GND
13
DIO_2
14
+5VDU
15
DIO_1
16
+5VDU
17
DIO_0
18
GND
19
GND
20
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Digital I/O Pin Assignment
Digital I/O
Digital I/O
X
Internal I/O Connectors
1
19
2
20
1
Pin Assignment
1
Ground
2
Power
3
Sense
System Fan 1/2/3
CPU Fan (PWM)
3-pin Fan Pin Assignment
4-pin Fan Pin Assignment
Pin Assignment
1
Ground
2
Power
3
Sense
4
Speed Control
Cooling Fan Connectors
X
Internal I/O Connectors
These fan connectors are used to connect to cooling fans. Cooling fans provide adequate air
circulation throughout the chassis and dissipate heat to prevent overheating of the system
board and components. The 4-pin fan provides PWM to modulate fan speed whereas the 3-pin
fans modulate fan speed via voltage modulation.
BIOS Setting
Configure the Smart Fans in the Advanced menu (“SIO NUVOTON6116D” submenu) of the
BIOS. Refer to chapter 3 for more information.
System Fan 1 (left), CPU Fan (right)
System Fan 3
System Fan 2
1
