Rj45 Null-Modem Cables (Rs-422); Rj45 Straight-Through Cables (Rs-232/485); Rj45 Loopback Plugs - Pepperl+Fuchs ICDM-RX/TCP-DB9/RJ45-PM Installation And Configuration Manual

ICDM-RX/TCP Installation and Configuration Guide

RJ45 Null-Modem Cables (RS-422)

connecting DTE devices.
Note: You may want to purchase or build a straight-through cable and purchase a null-modem adapter. For
example, a null-modem cable can be used to connect COM2 of one PC to COM2 of another PC.
7.2.2. RJ45 Null-Modem Cables (RS-422)
Use the following figure if you need to build an RS-422 null-modem RJ45 cable. A null-modem cable is required
for connecting DTE devices.
Note: RS-422 pin outs are not standardized. Each peripheral manufacturer uses different pin outs. Please
refer to the documentation for the peripheral to determine the pin outs for the signals above.

7.2.3. RJ45 Straight-Through Cables (RS-232/485)

Use the following figure if you need to build an RS-232 or RS-485 straight-through cable. Straight-through
cables are used to connect modems and other DCE devices. For example, a straight-through cable can be
used to connect COM2 of one PC to COM2 to a modem.

7.2.4. RJ45 Loopback Plugs

Loopback connectors are RJ45 serial port plugs with pins wired together that are used in conjunction with
application software (Test Terminal in PortVision DX or Minicom for Linux) to test serial ports. The ICDM-RX is
shipped with a a single loopback plug (RS-232/422).
RJ45
Signal
Pins
TxD 4
RxD 5
RTS 1
CTS 8
DSR 7
DCD 6
DTR 2
SIG GND
3
RJ45
Signal
Pins
TxD+ 1
TxD- 4
RxD+ 8
RxD- 5
SIG GND 3
RJ45
Signal Pins
6
DCD
5
RxD
4
TxD or TRxD-
2
DTR
3
SIG GND
7
DSR
1
RTS or TRxD+
CTS 8
DB9
DB25
RJ45
Pins
Pins Pins Signal
2 RxD
3
5
TxD
3 2
4
CTS
8
5 8
7 RTS
4
1
4 DTR
20
2
1 DCD
8
6
6 DSR
6
7
5 SIG GND
7
3
Signal
RxD+
RxD-
TxD+
TxD-
SIG GND
DB9 RJ45
DB25
Pins Pins Pins Signal
1 6
8
DCD
2 5
3
RxD
3 4 2
TxD or TRxD-
4 2 20
DTR
5 3
7
SIG GND
6 7
6
DSR
7 1 4
RTS or TRxD+
8 8
5 CTS
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