Chapter 2
20
OPC-1850 User’s Manual
COM port
COM port with the pin definition.
COM RS-232 / 422 / 485 Port DB-9
Pin
RS-232
RS-422
Half Duplex
RS-485
Full Duplex
RS-485
1
DCD
TX-
DATA-
TX-
2
RXD
RX+
NA
RX+
3
TXD
TX+
DATA+
TX+
4
DTR
RX-
NA
RX-
5
GND
GND
GND
GND
6
DSR
NA
NA
NA
7
RTS
NA
NA
NA
8
CTS
NA
NA
NA
9
RI
NA
NA
NA
Figure 6 COM port
COM