Rj45 Loopback Plugs; Rj45 Rs-485 Test Cable; Connecting Rj45 Devices - Comtrol DeviceMaster LT User Manual

RJ45 Loopback Plugs

RJ45 RS-485 Test Cable

Connecting RJ45 Devices

DeviceMaster LT User Guide: 2000586 Rev. B
Loopback connectors are RJ45 serial port plugs with pins
wired together that are used in conjunction with application
software (Test Terminal for Windows, which is available in
PortVision DX or Minicom for Linux) to test serial ports. The
DeviceMaster LT is shipped with a single loopback plug (RS-
232/422).
• Pins 4 to 5
• Pins 1 to 8
• Pins 2 to 3 to 7
You can use a straight-through cable as illustrated previously, or build your own
cable.
Note: RS-422 pinouts are not standardized. Each peripheral manufacturer uses
different pinouts. Refer to the documentation for the peripheral to determine
the pinouts for the signals above.
You can use this information to connect serial devices to RJ45 connectors.
1. Connect your serial devices to the appropriate serial port on the DeviceMaster
LT using the appropriate cable.
Note: Refer to the hardware manufacturer's installation documentation if you
need help with connector pinouts or cabling for the peripheral device.
2. Verify that the DeviceMaster LT LEDs indicate
that the devices are communicating properly.
The RX (green) and TX (yellow) LEDs functions
are displayed in the following table when the
cable is attached properly to a serial device.
LED Mode
RS-232
RX (Green)
RS-422/485
No mode
TX RS-232/
(Yellow) 422/485
RJ45
Pins Signal
Signal
7
TRxD- TRxD-
5
TRxD+
TRxD+
Description
No valid RS-232 device is connected
Valid RS-232 device is connected but
no data transmission is occurring
Data being received
No data being received
Data being received
No mode selected
No data being transmitted
Data being transmitted
RJ45 Loopback Plugs
LED Status
Always off
On
LED blinks
Always off
LED blinks
Always off
Always off
LED blinks
Connecting Serial Devices - 67