Denso BHT-100BW-CE User Manual page 94

Testing the direct-connect interface port
If the direct-connect interface test ends abnormally:
Selecting the "2:CONNECTOR" on the COM menu displays the
screen shown at left and then starts testing the direct-connect
interface port.
XXXXX: Transmission speed (300 or 115200 bps)
YYY: Hex data being sent (0 to 256)
Upon normal completion of the test, the tested slave BHT beeps once
and displays the screen shown at left.
If the test ends due to a timeout error, the tested slave BHT beeps
three times and displays the screen as shown at left.
This sample screen shows that an error has occurred at 300 bps.
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Chapter 2 Getting Started the BHT and System Menu