Digi TransPort WR31 User Manual page 48

Hardware
RS232 pinout
Pin # Direction
1 Out
2 Out
3 In
4 In
5 N/A
6 Out
7 In
8 Out
9 Out
RS422/ RS485 pinout
Pin # Direction
1 Out
2 Out
3 In
4 In
5 N/A
6 Out
7 In
8 Out
9 In
Notes
For true RS485 mode (2-wire half-duplex mode), the TD+ and RD+ pair and TD- and RD- pair
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should be connected together.
The CTS and RTS signals are optional normally not needed for RS485.
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Digi TransPort WR Routers User Guide
RS232 DCE Description
DCD Data Carrier Detect
RXD Receive Data
TXD Transmit Data
DTR Data Terminal Ready
GND Ground
DSR Data Set Ready
RTS Ready To Send
CTS Clear To Send
RI Ring Indicate
RS422/ RS485 Description
CTS- Clear To Send -
RD+ Receive Data +
TD+ Transmit Data +
RTS_B RTS- Ready To Send -
GND Ground
RD- Receive Data -
RTS+ Ready To Send +
CTS+ Clear To Send +
TD- Transmit -
TransPort WR31 hardware
48