DFI LR102-B18D/B18S - Manual (Page 29)

29
2
Hardware Installation
COM 3 and COM 4 RS232/RS422/RS485 Select
1-2 On: RS232
(default)
3-4 On: RS422
Half Duplex
5-6 On: RS485
1 3 5
2 4 6
COM 3 (JP3) and COM 4 (JP5) are used to configure COM 3 and COM 4 to
RS232, RS422 (Half Duplex) or RS485.
The pin function of COM 3 and COM 4 will vary according to their jumper’s set-
ting.
JP3 / JP5
COM 3 and COM 4
1 3 5 1 3 5
2 4 6 2 4 6
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.
JP3
JP5