2-12
H8DM3-2/H8DMi-2 User's Manual
Fan Headers
The H8DM3-2/H8DMi-2 has eight fan
headers, which are designated FAN1
through FAN8. FAN7 and FAN8
are for 4-pin Pulse Width Modulated
(PWM) fans and are to be connected
to the CPU heatsink fans. Their speed
is controlled via Thermal Management
with a BIOS setting. FAN1 through
FAN6 are 3-pin, non-PWM fans. See
the tables on the right for pin defi ni-
tions.
Note:
The nFAN1 header connects to
the heatsink fan on the nVidia MCP 55
Pro chip. Do not disconnect this fan
or the chipset may overheat. See the
table on the right for pin defi nitions.
Serial Ports
The COM1 port is located under the
parallel port. COM2 is a header
located beside the SATA5 port. See
the serverboard layout for locations
and the table on the right for pin
defi nitions.
Note:
NC indicates no connection.
Serial Port Pin Defi nitions
(COM1/COM2)
Pin # Defi nition
Pin # Defi nition
1
DCD
6
DSR
2
RXD
7
RTS
3
TXD
8
CTS
4
DTR
9
RI
5
Ground
10
NC
4-pin Fan Header
Pin Defi nitions
(FAN7/FAN8)
Pin# Defi nition
1
Ground (Black)
2
+12V (Red)
3
Tachometer
4
PWM Control
ATX PS/2 Keyboard and
PS/2 Mouse Ports
The ATX PS/2 keyboard and the
PS/2 mouse ports are located on the
IO backplane. The mouse is the top
(green) port. See the table on the
right for pin defi nitions.
PS/2 Keyboard and
Mouse Port Pin
Defi nitions
Pin# Defi nition
1
Data
2
NC
3
Ground
4
VCC
5
Clock
6
NC
3-pin Fan Header
Pin Defi nitions
(FAN1-FAN6)
Pin# Defi nition
1
Ground (Black)
2
+12V (Red)
3
Tachometer
