Denso BHT-100BW-CE User Manual page 64

If an error occurs during uploading
If some error occurs during uploading, one of the following screens will appear and the beeper beeps
three times.
Problem
The file you attempted to upload was opened.
Solution
Close the file to be uploaded, and then retry the upload.
Problem
Uploading has aborted.
Solution
Confirm the communications environment settings and then retry the
upload.
It is also necessary to check the communications environment setup
of the host computer.
Problem
The communications port has been already opened.
Solution
Close the communications port already opened for other processing
and then retry the upload.
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Chapter 2 Getting Started the BHT and System Menu