USB to RS-422 & RS-485 Adapter
-5-
PIN Assignments
DB-9 Connector
RS-422(DB-9M)
Pin#
Description
1.
TX-
2.
TX+
3.
RX+
4.
RX-
5.
GND
6.
RTS-
7.
RTS+
8.
CTS+
9.
CTS-
DB-9 DB-9
1 TX-
RX-
4
2 TX+
RX+
3
3 RX+
TX+
2
4 RX-
TX-
1
5
G
G
5
6
RTS-
CTS-
9
7
RTS+
CTS+
8
8
CTS+
RTS+
7
9
CTS-
RTS-
6
RS-485(DB-9M)
Pin#
Description
1.
D+(TX)
2.
D-(RX)
3.
4.
5.
GND
6.
7.
8.
9.
DB-9 DB-9
1. D+(TX)
D+(TX) 1
2 D-(RX)
D-(RX) 2