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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 instruc-
tions on how to clear the CMOS.
For ATX power supply, you
need to completely 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 reset-
ting the CMOS contents is by
pressing the <ins> key, then turn-
ing 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
definitions.
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 lo-
cated on JT3.
The CPU fans are
located on JT1 and JT2. Refer to
Table 2-17 for pin definitions.
Chapter 2:
Table 2-13
ATX Serial Ports Pin Definitions
J20
Pin Number Definition
Pin Number Definition
1
DCD
2
DSR
3
Serial In
4
RTS
5
Serial Out
Table 2-14
CMOS Clear Pin Definitions
for Number JBT1
Jumper
Position
Definition
1-2
Normal
2-3
CMOS Clear
Position
Position
1-2
Table 2-15
External Battery Pin
Definitions
for JBT2
Pin
Number
Definition
1
+3V
2
NC
3
NC
4
Ground
Table 2-16
Wake-on-LAN Pin
Definition located at
WOL
Pin
Number
Definition
1
+5V Standby
2
Ground
3
Wake up
Table 2-17
Fan Connectors Pin
Definitions for JT1, JT2, JT3
Pin
Number
Definition
1
Ground (black)
2
+12V (red)
3
Tachometer
* Caution: These fan connectors
are DC direct.
2-9
Installation
J21
6
CTS
7
DTR
8
RI
9
Ground
10
NC
2-3
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