Chapter 2
24
QBOX-2600 User’s Manual
COM 2
COM 1
COM Ports
COM ports with the pin definitions.
COM1 RS-232/422/485 Port 1 D-SUB 9P
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
+5V
+5V
+5V
+5V
COM2 RS-232/422/485 Port 2 D-SUB 9P
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
+5V
+5V
+5V
+5V
Figure 7 Com ports