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2.3 Alarm Board Interface (CN2)
The 20-pin connector CN2 is an interface for an external monitoring
and alarm module, such as MIC-3920/MIC-3921, which monitors the
system conditions. It contains bus voltages 3.3V, 5V , 12V and -12V,
and utilizes four fan tachometer signals and an on-off control signal.
Table 2-5. CN2 Connector Pin Assignments
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
#: Low active
Pin Assignment
FAN2
FAN1
FAN4
FAN3
N/C
POWER_FAIL#
N/C
N/C
N/C
N/C
N/C
PSON#
GND
GND
PRST#
+12V
-12V
+3.3V
+5V
+5V
Chapter 2 Hardware Configuration
1
2
3
4
5
6
7
8
9
1 0
11
1 2
1 3
1 4
1 5
1 6
1 7
1 8
1 9
2 0
CN2 Connector
Pin Locations
13
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