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Serial port communication issues
6. Start typing characters on your keyboard. The characters you type should echo back and be
displayed on your screen (once). If you remove the loopback plug from the port and keep
typing, you should not see any data on your screen.
To disconnect from the port, issue the telnet escape sequence: <Ctrl> ]. Enter quit at the
telnet prompt.
7. Loopback testing failure typically points to a hardware issue with the serial port. Contact Digi
Technical Support for possible product repair arrangements.
Digi CM and Passport Troubleshooting Guide
Serial loopback testing
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