Comtrol UP 16-Port - Manual (Page 27)

DeviceMaster UP 16-Port Hardware User Guide: 2000596 Rev. B Connecting Serial Devices - 27
RJ45 Loopback Plugs
RJ45 Loopback Plugs
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 UP is shipped with a single loopback plug (RS-
232/422).
• Pins 4 to 5
• Pins 1 to 8
• Pins 2 to 3 to 7
RJ45 RS-485 Test Cable
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.
Connecting RJ45 Devices
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
UP 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 UP LEDs indicate
that the devices are communicating properly.
The LED functions are displayed in the following
table when the cable is attached properly to a
serial device.
3. You can refer to DeviceMaster UP LEDs on Page 53 for information about the
remaining LEDs.
Note: The RX/TX LEDs cycle during a reboot cycle.
TRxD-
TRxD+
Signal
TRxD-
TRxD+
Signal
RJ45
7
5
Pins
LED Mode Description LED Status
RX
(Green)
RS-232
No valid RS-232 device is connected Always off
Valid RS-232 device is connected but
no data transmission is occurring
On
Data being received LED blinks
RS-422/485
No data being received Always off
Data being received LED blinks
No mode No mode selected Always off
TX
(Yellow) RS-232/
422/485
No data being transmitted Always off
Data being transmitted LED blinks