| 摘要 |
PROBLEM TO BE SOLVED: To confirm alarming contents and the restoration procedure by images when an alarm is operated to issue an alarm and to easily understand the contents when the various kinds of the functions of an interphone are operated. SOLUTION: An interphone master unit 2 is provided with an alarm display circuit 18 provided with a reception circuit 19 for receiving alarm signals, a memory 21 for storing the alarming contents of the alarm and the restoration procedure images beforehand corresponding to the alarm signals and a transmission circuit 20 for transmitting the alarming contents and the restoration procedure images stored beforehand to a monitor 15 when the reception circuit receives the alarm signals and a switch 17 for connecting the monitor to a camera 14 at all times and switching it to the transmission circuit when the reception circuit receives the alarm signals.
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