Com 2 Rs232/Rs422/Rs485 Select - DFI NP951-B16C User Manual

2
Hardware Installation

COM 2 RS232/RS422/RS485 Select

JP9 is used to configure COM 2 to RS232, RS422 (Full Duplex) or RS485.
The pin function of COM 2 will vary according to the jumper's setting.
6
4
2
1-2 On: RS232
(default)
CTS-
DSR-
DTR-
RD
24
5
3
1
9
RI-
RTS-
GND
TD TXD-
DCD-
RXD-
2 1
JP9
5
6
3
4
1
2
3-4 On: RS422
Full Duplex
COM 2
9
N.C.
N.C. N.C.
N.C. N.C.
TXD+
RXD+
2 1
JP9
COM 2
5
6
3
4
1
2
5-6 On: RS485
9
N.C.
N.C. N.C.
N.C. N.C.
N.C. N.C.
DATA+
DATA-
2 1