| 摘要 |
PURPOSE:To make the tiled circuit usable for a terminal equipment by devising the circuit such that an ON signal is generated when circuits A and B are not connected and a signal according to a signal of the circuit B is generated when the circuits A and B are connected. CONSTITUTION:The titled circuit generates an OFF signal when the output signal line of the circuit B is not active, generates an ON signal when the circuits A and B are not connected as to a signal line giving an ON signal at the active state and generates a signal according to the circuit B when the circuits A and B are connected. Thus, even if a specific control line has no output from an opposite equipment (MODEM), the corresponding signal line shows an open input to an interface circuit at the terminal equipment and the ON signal is to be received. As a result, in receiving the OFF signal, even when the processing sequence of the terminal equipment is designed to stop or interrupt the processing, since the control line receives no OFF signal, the processing is able to be initiated or continued.
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