| 摘要 |
PURPOSE:To mutually monitor the runaway of control circuits in communication terminals and to respond to the runaway, by providing a function to output a reset signal to the control circuit by the signal of a communication line on the communication control circuit of the communication terminal. CONSTITUTION:When the runaway occurs in the control circuit 11 of the communication terminal 2 due to an unknown cause, each communication control circuit of other communication terminals 3-9 discriminates the runaway of the communication terminal 2 by the fact that no output data of the communication terminal 2 is inputted from the communication line 1 for a prescribed time, or by inputting a prescribed form of data, and outputs an abnormality signal to the said communication terminal 2, and transmits it to the communication line 1. Meanwhile, the communication control circuit 10 of the communication terminal 2, when receiving the input of the above stated abnormality signal from the communication line 1, outputs the reset signal from a reset circuit, and reset the control circuit 11, then stops the runaway. The control circuit 11, after being reset, is started up again, and starts the control of the terminal again. In such a way, the communication terminal 2 is recovered to an ordinary state.
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