Denso BHT-100BW-CE User Manual page 66

[2.2] ActiveSync(IrDA)
Choosing "2:ActiveSync (IrDA)" on the Communication menu connects the BHT to the host computer via
the IrDA interface port.
When connecting the BHT to the host computer using ActiveSync (IrDA), arrange the BHT and host
computer with their IrDA ports facing directly each other.
When the BHT is connected with the host via the CU-7000, no ActiveSync can be used
If connection using ActiveSync fails
If connection using ActiveSync fails, the BHT beeps three times and displays the following screen.
Upon completion of connection, the screen shown at left appears.
For details about the configuration of the host computer and
connection using ActiveSync, refer to Chapter 3, Section 3.5
"ActiveSync."
Solution
Check the ActiveSync setting in the host computer and the facing
direction of the IrDA ports of the BHT and host computer, and then
retry the connection operation.
For the ActiveSync setting in the host computer, refer to Chapter 3,
Section 3.5.1.
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Chapter 2 Getting Started the BHT and System Menu