DFI CA331-NR - Manual (Page 28)

28
2
Hardware Installation
COM 3 RS232/RS485 Select
JP3
JP3 is used to configure COM 3 to RS232 or RS485.
The pin function of COM 3 will vary according to JP3’s setting.
JP3
COM 3
1-2 On: RS232
(default)
5-6 On: RS485
Half Duplex
6 2
5 3 1
4
DCD-
TD
RD D
TR
-
GND R
T
S-
DSR
-
CT
S-
RI
-
1 9
2
DA
TA+ N.C.
DA
TA
-
N.C.
N.C. N.C.
N.C. N.C.
N.C.
1 9
2
COM 3
6 2
5 3 1
4