15
(1)
COM12: RS232/422/485 Ports
COM1/COM2 port can function as RS232/422/485 port. In normal settings
COM1/COM2 functions as RS232 port. With compatible COM cable COM1/COM2
can function as RS422 or RS 485 port. User also needs to go to BIOS to set
‘Transmission Mode Select’
for COM1/COM2 at first, before using specialized cable
to connect different pins of this port.
For RS422 Mode
R
S
4
2
2
T
X
-(B
)
R
S
4
2
2
T
X
+
(A
)
R
S
4
2
2
R
X
+
(A
)
R
S
4
2
2
R
X
-(B
)
(B
)
For RS485 Mode
R
S
4
8
5
D
-(B
)
R
S
4
8
5
D
+
(A
)
(2)
ATXPWR(24-pin block): Main Power Connector
PIN ROW1
ROW2
1
+3.3V
+3.3V
2
+3.3V
-12V
3
GND
GND
4
+5V
Soft Power on
5
GND
GND
6
+5V
GND
7
GND
GND
8
Power OK
-5V
9
+5V Stand by +5V
10
+12V
+5V
11
+12V
+5V
12
+3.3V
GND
Pin1
Pin12
Row1
Row2
