TransPort WR21 hardware
Digi TransPort User Guide 33
RS422/ RS485 pinout
Notes
• For true RS485 mode (2-wire half-duplex mode), the TD+ and RD+ pair and TD- and RD- pair
should be connected together.
• The CTS and RTS signals for optional and not normally needed for RS485.
Pin # Direction RS422/ RS485 Description
1Out CTS- Clear To Send -
2 Out RD+ Receive Data +
3 In TD+ Transmit Data +
4 In RTS_B RTS- Ready To Send -
5N/A GND Ground
6 Out RD- Receive Data -
7In RTS+ Ready To Send +
8Out CTS+ Clear To Send +
9In TD- Transmit -
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