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Mounting the Utility Communication Hub
Install the cable
The DB9 connector in the Utility Communication Hub is pre-wired straight through to
the RS-232/485 connection.
Note
If you require an RS-232/485 connection you must provide your own cable.
Pin #
1
2
3
4
5
6
7
8
9
Pin #
1
2
3
4
5
6
7
8
9
Note
For true RS-485 mode (2-wire half-duplex mode), the TD_A and RD_A pair and TD_
B and RD_B pair must be connected together. The CTS and RTS signals are optional and
not normally needed for RS485.
Digi Utility Communication Hub for TransPort® WR21 Installation Guide
Direction
RS-232 DCE
Out
DCD
Out
RXD
In
TXD
In
DTR
N/A
GND
Out
DSF
In
RTS
Out
CTS
Out
RI
RS-422/RS-485
Direction
RS-232 DCE
Out
CTS_B
Out
RD_A
In
TD_A
In
RTS_B
N/A
GND
Out
RD_B
In
RTS_A
Out
CTS_A
In
TD_B
RS-232
Description
Data carrier detect
Receive data
Transmit data
Data terminal ready
Ground
Data set ready
Ready to send
Clear to send
Ring indicate
Description
Clear to send B
Receive data A
Transmit data A
Ready to send B
Ground
Receive data B
Ready to send A
Clear to send A
Transmit data B
Install the cable
12
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