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Serial Device
2
RX
3
TX
5
GND
7
RTS
8
CTS
□
□ RS-422 Pin Assignment
□
The pin assignment scheme for a 4-pin RS-422 is given below.
RS-422:
PIN 1: T+
RS-485: PIN 1: D+
□
□ RS-422 Wiring Diagram
□
Serial Device
R-
R+
T-
T+
□
□ RS-485 Wiring Diagram
□
Serial Device
D-
D+
USB to RS-232/422/485 Converter
1 2 3 4
PIN 2: T-
PIN 2: D-
USB to RS-232/422/485 Converter
USB to RS-232/422/485 Converter
23
3
TX
2
RX
5
GND
(Flow Control)
8
CTS
(Flow Control)
7
RTS
PIN 3: R+
PIN 4: R-
2
T-
1
T+
4
R-
3
R+
2
D-
1
D+
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