Vivotek IP2121 - Manual (Page 25)

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4. Choose the serial port that the included null modem cable is attached to and click on
. The null modem is now ready for use.
If no Dial-Up adapter exists
in the system, Windows may
automatically prompt to
install. Press
to
continue. If it does not start
automatically, double click
the network icon in control
panel to install Microsoft
dial-up adapter.