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A1SAi & A1SRi Series Motherboard User's Manual
Fan Headers (Fan 1 ~ Fan 3)
The A1SAi & A1SRi Series motherboard has
three 4-pin fan headers (Fan 1~Fan 3). Although
pins 1-3 of the fan headers are backward
compatible with the traditional 3-pin fans, we
recommend to use 4-pin fans to take advan-
tage of the fan speed control via Pulse Width
Modulation through the BMC. This allows the
fan speeds to be automatically adjusted based
on the motherboard temperature. Refer to the
table on the right for pin definitions.
Chassis Intrusion (JL1)
A Chassis Intrusion header is located at JL1 on
the motherboard. Attach the appropriate cable
from the chassis to inform you of a chassis intru-
sion when the chassis is opened.
JUIDB1
VGA
BMC
LAN2/LAN4
JI2C1
A1SAi/A1SRi Series Motherboard
Rev. 1.00
JI2C2
Battery
JWD1
JF1
1
J3
SP1
B
USB2.0-0/1
USB3.0-0/1
IPMI_LAN
LAN1/LAN3
Marvell
PHY
D
BIOS
JBT1
CPU
2-20
Pin#
1
2
3
4
Pin#
1
2
A. Fan 1
COM1
B. Fan 2
C. Fan 3
D. Chassis Intrusion
C
FAN3
A
FAN1
Fan Header
Pin Definitions
Definition
Ground (Black)
3A/+12V (Red)
Tachometer
PWM_Control
Chassis Intrusion
Pin Definitions (JL1)
Definition
Intrusion Input
Ground
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