20
(7) COM2/3/4/5/6 (9-pin): Serial Port Header
COM2
：
RS232/422/485 Serial Port;
COM3/4/5/6
：
RS232 Serial Port Header.
Pin 1
*Notice: COM2 header can function as RS232/422/485 port header. In normal
settings COM2 functions as RS232 header. With compatible COM cable COM2 can
function as RS422 or RS 485 header. User also needs to go to BIOS to set
‘Transmission Mode Select’ for COM2
(refer to Page-31)
at first, before using
specialized cable to connect different pins of this port.
(8) SMBUS (5-Pin): SMBUS Header
Pin1
Pin NO. RS232
*RS422
(optional)
*RS485
(optional)
Pin 1
DCD
TX-
DATA-
Pin 2
RXD
TX+
DATA+
Pin 3
TXD
RX+
NC
Pin 4
DTR
RX-
NC
Pin 5
GND
GND
GND
Pin 6
DSR
NC
NC
Pin 7
RTS
NC
NC
Pin 8
CTS
NC
NC
Pin 9
RI
NC
NC
COM6
COM4
COM3
*COM2
SMBUS
6
COM5
V
CC3
G
ND
S
M
BUS
_AL
E
R
T
-
S
M
BUS
_DAT
A
S
M
BUS
_CL
K
