Appeal No. 1996-3276
Application 07/978,518
and 11 to 25, other claims having been canceled.
The disclosed invention relates to the transfer of a
communication signal composed of plural messages, where a
group of pulse-string signals represents a message, the
communication protocol prescribes the maximum bit length in
one message and minimum idle time between successive
messages. The invention is directed to a monitoring circuit
which includes counting means and idle time measuring means.
The counting means counts pulses in a message and outputs an
abnormal signal indicating an abnormal situation of
communication device when the counted number exceeds a
predetermined number. The idle time measuring means inputs
the communication signal, measures idle time between
successive groups of the pulse-string signals, and resets the
counting means when the measured idle time exceeds a
predetermined time. The invention is further described by the
following representative claim.
Claim 1 is reproduced as follows:
1. A monitoring circuit for a communication device which
outputs a communication signal including plural groups of
2
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