11
(1) COM (9-pin Block): RS232/422/485 Serial Port
COM port can function as RS232/422/485 port. In normal settings COM functions as
RS232 port. With compatible COM cable they can function as RS422 or RS 485 port.
User also needs to go to BIOS to set
‘
Transmission Mode Select
’
for COM (refer to
Page 25) at first, before using specialized cable to connect different pins of this port.
1 2 3 4 5
6 7 8 9
R
S
23
2 D
C
D
#
R
S
23
2
S
IN
R
S
23
2 S
O
U
T
R
S
23
2
D
TR
#
G
N
D
R
S
23
2 R
I#
R
S
23
2 C
TS
#
R
S
23
2
R
TS
#
R
S
23
2 D
S
R
#
Pin1
For RS422 Mode
R
S4
22
TX
-(B
)
R
S4
22
TX
+(A
)
R
S4
22
R
X+
(A
)
R
S4
22
R
X-(
B
)
(B
)
For RS485 Mode
R
S4
85
D
-(B
)
R
S4
85
D
+(A
)
