| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an intercom system capable of properly operating even when the intercom master unit is connected to plural power sources each having a different voltage.SOLUTION: The intercom system includes: a voltage measurement section 32 that, when a supply voltage is applied to an intercom master unit 20, measures a voltage value of a supply voltage; and a master unit control section 28 that determines an operation mode corresponding to the voltage value measured by the voltage measurement section 32 referring to a corresponding mode table which stores plural supply voltage rages and operation modes in association with each other, and controls the intercom master unit 20 with the determined operation mode.</p> |
