User`s manual

4-42 NPort Server Lite User’s Manual
Test Item Selection
Click the Test Item tab in the Diagnostic Config window.
The tests that you want to run should be checked. Add or remove check marks as necessary
by clicking inside the appropriate check box.
q Internal Test: If this test item is selected an internal test will be done on the RS-232
serial port, and the result (successful or failed) will be displayed when the test is
completed.
q External Test: If this test item is selected, an external test will be done to check that
the connection signals for each port are working properly. For the external test, you
will need to connect each port to a loopback tester. Refer to Appendix C for the
specifications. If you are using Model DE-331, the external loopback test only applies
to the RS-422 mode. The items DTR à DSR and DTR à DCD are not supported.
The items described below which are check marked will be tested.
• Tx n Rx: Displays the test result of tranmitting and receiving data between two
ports.
• RTS g CTS: Displays the test result of the RTS and CTS signals between two
ports.
• DTR g DSR: Displays the test result of the DTR and DSR signal between two
ports.
• DTR g DCD: Displays the test result of the DTR and DCD signal between two
ports.