| 摘要 |
PURPOSE:To analyze in detail the trouble and to shorten the interface trouble cause pursuing time by providing the a signal change detecting circuit, a memory circuit, etc., and storing the condition of the interface signal for a constant time. CONSTITUTION:Input output control signals X1-X3 and Y1-Y3 are selected at a selecting circuit 2-2, and inputted to a signal change detecting circuit 2-3. At the circuit 3, the change of the polarity of the selected signal is detected, and a starting trigger signal is given to a timing generating circuit 2-5 and a timer circuit 2-4. At the circuit 2-5, a trigger signal from the circuit 2-3 is received, and to a memory circuit 2-6, the timing necessary to store the condition of '1' and '0' of the signals X1-X3 and Y1-Y3 is supplied. Thus, the dialog of the interface in a certain time belt is stored to the circuit 2-6, and when the interface trouble is informed, the contents of the 2-6 can be read watched. Consequently, the trouble can be analyzed in detail and the pursuing time of the interface trouble cause can be shortened.
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