INTERPHONE SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide an interphone system capable of reopening operation soon even when a system becomes inoperable by allowing only the interphone sub-master set to restart while a doorphone slave set and an interphone sub master set are speaking. SOLUTION: When the interphone master set 2 sends a system reset signal to an interphone master set 1 when restarted. The set 1 is restarted receiving a system reset signal from the set 2.