DFI CP337-NRM - Manual (Page 24)

24
2
Hardware Installation
1
COM 3 RS232/RS422/RS485 Select
JP4
JP4 is used to configure COM 3 to RS232, RS422 (Half Duplex) or RS485.
The pin function of COM 3 will vary according to the jumper’s setting.
JP4
COM 3
1-2 On: RS232
(default)
3-4 On: RS422
Half Duplex
5-6 On: RS485
6
4
2
5
3
1
6
4
2
5
3
1
6
4
2
5
3
1
1 9
2
DCD- TD
RD
D
TR
-
GND R
T
S-
DSR
-
CT
S-
RI
-
1 9
2
RXD+ N.C.
RXD-
N.C.
N.C. N.C.
N.C. N.C.
N.C.
1 9
2
DA
TA+
N.C.
DA
TA
-
N.C.
N.C. N.C.
N.C. N.C.
N.C.
COM 3