| 摘要 |
A facsimile device connected to a public line in parallel with an external telephone is provided. The facsimile device includes a facsimile circuit configured to send and receive image data through the public line, a voltage detector that detects a voltage of the public line, a telephone status monitoring unit configured to judge whether the external telephone closes the public line based on the voltage of the public line detected by the voltage detector and a reference voltage, a monitoring operation control unit configured to keep the telephone status monitoring unit in an inactive state until a predetermined time elapses from a time when the facsimile circuit releases the public line, and to activate the telephone status monitoring unit if the predetermined time elapses from the time when the facsimile circuit releases the public line.
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