Connecting Serial Devices 17
Building Additional RJ45 Loopback Plugs
Building Additional
RJ45 Loopback
Plugs
Loopback connectors are RJ45 serial port plugs, with pins wired together as
shown, that are used in conjunction with application software to test serial ports.
The DeviceMaster RTS is shipped with a a single loopback plug (RS-232/422).
•Pins 4 to 5
•Pins 1 to 8
• Pins 2 to 6 to 7
Note: Drivers for Windows 98
and Windows NT are
bundled with the Test
Terminal (WCOM32) program. Linux users can use MiniCom. See the NS-
Link driver documentation for your operating system for information about
using these applications.
Building an RS-485
Test Cable
You can use a straight-through cable as illustrated previously, or build your own
cable.
18
Plug
Top View
Cable
The RS-232 loopback plug also
works for RS-422.
TxD or TRX-
RTS or TRX+
Signal
TxD or TRX-
RTS or TRX+
Signal
RJ45
4
1
Pins
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