Denso BHT-100B, BHT-100Q Testing the optical interface port

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Testing the optical interface port
Selecting the "1:OPTICAL" on the TEST COM menu
calls up the screen shown at left.
At the slave BHT to be tested, select the "1:SLAVE"
and at the master BHT, select the "2:MASTER."
Then press the ENT key on each BHT.
During the test, the screen shown at left is dis-
played.
If any error occurs, the tested slave 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: 2400 bps
2: 9600 bps
3: 115200 bps
Press the C key to return to the MASTER/SLAVE
selection menu.
The master BHT will automatically return to the
MASTER/SLAVE selection menu after 10 seconds
from the occurrence of an error.