TransPort WR31 hardware
Digi TransPort User Guide
40
RS-232 pinout
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
RS232 DCE
Description
1
Out
DCD
Data Carrier Detect
2
Out
RXD
Receive Data
3
In
TXD
Transmit Data
4
In
DTR
Data Terminal Ready
5
N/A
GND
Ground
6
Out
DSR
Data Set Ready
7
In
RTS
Ready To Send
8
Out
CTS
Clear To Send
9
Out
RI
Ring Indicate
Pin #
Direction
RS422/ RS485 Description
1
Out
CTS-
Clear To Send -
2
Out
RD+
Receive Data +
3
In
TD+
Transmit Data +
4
In
RTS_B RTS-
Ready To Send -
5
N/A
GND
Ground
6
Out
RD-
Receive Data -
7
In
RTS+
Ready To Send +
8
Out
CTS+
Clear To Send +
9
In
TD-
Transmit -
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