Denso BHT-300B User Manual page 97

Testing the direct-connect interface port
On the TEST COMMUNICATION menu, selecting "2: CONNECTOR"
displays the screen shown at left and then starts testing the
direct-connect interface port.
If any error occurs, the BHT beeps three times and shows the screen
at left.
In parentheses are error codes which have the following meanings:
(X X)
1: The received data is different from the sent data.
2: A timeout has occurred during standby for data
reception.
1: 300 bps
2: 115200 bps
Upon normal completion of the test, the BHT beeps once and shows
the screen at left.
Press the C key to return to the TEST COMMUNICATION menu.
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Chapter 2 Getting Started the BHT and System Mode