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ICDM-RX/TCP Installation and Configuration Guide
DB9 Loopback Plugs
7.1.4. DB9 Loopback Plugs
Loopback connectors are DB9 female serial port plugs with pins wired together that are used in conjunction
with application software (Test Terminal in PortVision DX or Minicom) to test serial ports. The ICDM-RX is
shipped with a a single loopback plug (RS-232/422).
Note: You can use Test Terminal in PortVision DX (Windows) or Minicom (Linux) to test the serial port. You
can refer to Testing Ports Using Test Terminal on Page 134 for Windows systems.
Wire the following pins together to build additional plugs or replace a missing RS-232 loopback plug:
•
Pins 1 to 4 to 6
•
Pins 2 to 3
•
Pins 7 to 8 to 9
Wire the following pins together for an RS-422 loopback plug:
•
Pins 2 to 3
•
Pins 7 to 8
7.1.5. Connecting DB9 Serial Devices
You can use this information to connect serial devices to DB9 connectors.
1. Connect your serial devices to the appropriate serial port on the ICDM-RX/TCP using the appropriate
cable.
Note: Refer to the hardware manufacturer's installation documentation if you need help with connector
pin outs or cabling for the peripheral device.
2. Verify that the devices are communicating properly.
Note: ICDM-RX DIN models do not have TX/RX LEDs.
The RX (yellow) and TX (green) LEDs function accordingly when the cable is
attached properly to a serial device.
•
After power cycling the ICDM-RX (appropriate models), the RX/TX LEDs
are off.
•
The LEDs do not function as described until the port has been opened by an application. You can use
Test Terminal in PortVision DX to open a port or ports if you want to test a port or ports (Testing Ports
Using Test Terminal on Page 134)
Mode
RS-232
RS-422
RS-485
3. You can refer to ICDM-RX/TCP LEDs on Page 148 for information about the remaining LEDs.
Pin 1
Pin 6
Pin 1
Pin 6
RX LEDs (yellow) are lit while receiving data
TX LEDs (green) are lit during active data transmission
Pin 5
RS-232 Only
(Back View)
Pin 9
Pin 5
RS-422 Only
(Back View)
Pin 9
LEDs
The RS-232 loopback plug
also works for RS-422.
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Troubleshooting
