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2-6
Connecting Cables
Power Supply Connectors
The primary power supply
connector (J20) on the P4SCA/
P4SCE meets the SSI (Superset
ATX)
24-pin specification. Refer
to the table on the right for the
pin definitions of the ATX 20-pin
power connector.
connect the 4-pin (J21) proces-
sor power connector to your
power supply. Refer to the table
below right for the J21 (12V)
connector. If J21 is not acces-
sible, there is another 4-pin
power connector (J38) available
on the motherboard. J38 is
located close to the ATX PWR
Connector and next to the COM2
port. See the table on the right
for the pin definition. (*You must
use either J38 or J21 for CPU
Power.)
IR Connector
The infrared connector is located
at J16. See the table on the right
for pin definitions. See the Tech-
nical Support section of our web
page for information on the infra-
red devices you can connect to
the system.
PW_ON Connector
The PW_ON connector is located
on pins 1 and 2 of JF1.
You must also
2-7
Chapter 2: Installation
ATX Power Supply 24-pin Connector
Pin Definitions (J20)
Pin Number Definition
13
+3.3V
14
-12V
15
COM
16
PS_ON#
17
COM
18
COM
19
COM
20
Res(NC)
21
+5V
22
+5V
23
+5V
24
COM
+12V 4-pin
Connector
(J21)
Required
Pins #
1 & 2
Connection
3 & 4
+12V 4-pin
Connector
(J38)
Additional
Pins #
Connection
1
2 & 3
4
(*Note: For CPU Power, you must
use either J21 or J38)
Infrared Pin
Definitions
(J16)
Pin
Number
Definition
1
2
3
4
Ground
5
6
PW_ON
Pin Definitions
(JF1)
Pin
Number
1
2
Pin Number Definition
1
+3.3V
2
+3.3V
3
COM
4
+5V
5
COM
6
+5V
7
COM
8
PWR_OK
9
5VSB
10
+12V
11
+12V
12
+3.3V
Definition
Ground
+12 V
Definition
+12V
Ground
NC
+5V
CIRRX
IRRX
IRTX
NC
Definition
PW_ON
+3V
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