Appeal No. 96-0974
Application 08/024,299
address DA, a sender address SA, an information portion, and
an error detection portion EC (col. 1, lines 61-65; col. 2,
lines 43-49). During transmission, the transmitting station
(e.g., S1) simultaneously applies the transmitted signal to
both transmission lines via transmission drivers 2a and 2b
(col. 2, lines 43-46). At the receiving station, the signals
received on lines A and B are coupled via receiving drivers 3a
and 3b, respectively, to
input terminals of a changeover switch 4 for selectively
connecting one or the other of the received transmission line
signals to the input of receiving circuit 5 (col. 2, lines
50-55). The state of the switch is controlled by a
transmission line check circuit 6, sender address detection
circuits 8a and 8b, and abnormality check circuit 9 (col. 2,
lines 58-68). These circuits determine whether the
transmission lines are normal or abnormal and the results of
this analysis are fed to CPU 10, which operates changeover
switch 4, if necessary, to connect a normal signal to the
input of receiving circuit 5 (col. 3, lines 1-12). The CPU
includes a display control circuit 11 through which the check
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Last modified: November 3, 2007