| 摘要 |
A facsimile machine, capable of being connected to an external telephone, including a data access apparatus in the form of a semiconductor device, includes a power circuit configured to output a calling signal and supply voltage to the external telephone; a relay configured to switch between a first state in which the external telephone is connected to the power circuit and a second state in which the external telephone is connected to a public line; a detection portion configured to detect a signal level of a signal line between the power circuit and the relay; and a control portion configured to issue an output instruction of the calling signal to the power circuit on the basis of the content of a signal received by the data access apparatus and a detection result obtained by the detection portion in the first state. |
