Rj45 loopback plug, Rs-232/rs-422 loopback plug, Rs-485 test cable – Comtrol Cable User Manual
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24 [Documentation number: 2000430 Rev B]
Building Cables for DeviceMaster Products
RJ45 Loopback Plug
RJ45 Loopback Plug
A loopback plug is an RJ45 serial port plug with pins wired together. You can use
it with application software (for example, Test Terminal or MiniCom) to test serial
ports.
The RS-232/422 single loopback plug is shipped with the following DeviceMaster
models: DeviceMaster RTS, DeviceMaster PRO and DeviceMaster UP.
RS-232/RS-422
Loopback Plug
To build an RS-232/RS-422 loopback plug, wire the following pins together:
•
Pins 4 to 5
•
Pins 1 to 8
•
Pins 2 to 6 to 7
Note: For more information on
testing serial ports, see
the Help in Test
Terminal (WCom2.exe).
Test Terminal is installed when you install PortVision.
RS-485 Test Cable
You can use a straight-through cable as illustrated previously, or build your own
cable.
1
8
Plug
Top View
Cable
The RS-232 loopback plug also
works for RS-422.
TRX-
TRX+
Signal
TRX-
TRX+
Signal
RJ45
4
1
Pins