Digi TransPort WR11 User Manual page 39

Hardware features
Pin # Direction
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
n
should be connected together.
The CTS and RTS signals are optional and not normally needed for RS485.
n
Digi TransPort® Routers User Guide
RS422/ RS485
RD-
RTS+
CTS+
TD-
TransPort WR21 hardware features
Description
Receive Data -
Ready To Send +
Clear To Send +
Transmit -
39