Chapter 2
21
KPC-2150 Series User’s Manual
COM ports
COM ports with the pin definitions.
COM1~COM2 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+
N/A
RX+
3
TXD
TX+
DATA+
TX+
4
DTR
RX-
N/A
RX-
5
GND
GND
GND
GND
6
DSR
N/A
N/A
N/A
7
RTS
N/A
N/A
N/A
8
CTS
N/A
N/A
N/A
9
RI
RI
RI
RI
Figure 6 COM port
COM