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ATX Serial Ports
ATX serial port COM1 is located
on J20 and serial port COM2 is
located on J21. See Table 2-13
for pin definitions.
CMOS Clear
Refer to Table 2-14 for instructions
on how to clear the CMOS. For ATX
power supply, you need to com-
pletely shut down the system,
then use JBT1 to clear the CMOS.
Do not use the PW_ON connector to
clear the CMOS. A second way of
resetting the CMOS contents is by
pressing the <ins> key, then turning
on the system power. Release the
key when the power comes on.
External Battery
Connect an external battery to JBT2.
Refer to Table 2-15 for pin defini-
tions. (Not on P6SBM.)
Wake-On-LAN
The Wake-On-LAN connector is lo-
cated on WOL. Refer to Table 2-16
for pin definitions.
Fan Connectors*
The thermal/overheat fan is located
on JT3. The CPU fans are located on
JT1 and JT2. Refer to Table 2-17 for
pin definitions.
ATX Serial Ports Pin Definitions
J20
Pin Number
Definition
1
2
3
Serial In
4
5
Serial Out
CMOS Clear Pin Definitions
for Number JBT1
Jumper
Position
1-2
2-3
Position
1-2
External Battery Pin
Pin
N u m b e r
1
2
3
4
Wake-On-LAN Pin
Definition located at
Pin
N u m b e r
1
2
3
Fan Connectors Pin
Definitions for JT1, JT2, JT3
Pin
N u m b e r
1
2
3
* Caution: These fan connectors
are DC direct.
2-11
Chapter 2: Installation
Table 2-13
J21
Pin Number Definition
D C D
6
C T S
D S R
7
D T R
8
R T S
9
G r o u n d
10
Table 2-14
Definition
Normal
C M O S C l e a r
Position
2-3
Table 2-15
Definitions
for JBT2
Definition
+ 3 V
N C
N C
G r o u n d
Table 2-16
W O L
Definition
+5V Standby
G r o u n d
W a k e u p
Table 2-17
Definition
Ground (black)
+12V (red)
Tachometer
RI
N C
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