Denso BHT-100BW-CE User Manual page 68

If connection to the network fails
If connection to the network fails, the BHT beeps three times and displays the following screen.
If no partnership has been set up
If no partnership has been set up between the host computer and BHT, the BHT beeps three times and
displays the following screen.
Upon completion of connection by ActiveSync, the screen shown at
left appears.
Solution
The RF settings may have not been made correctly. According to the
procedure given in "[3.4] RF Menu (Network Interface Control)," make
the correct RF settings.
Solution
Set up a partnership according to the procedure given in Section
3.5.2, "Connection Using ActiveSync."
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Chapter 2 Getting Started the BHT and System Menu