INTERPHONE SYSTEM AND ALARM REPORTING SYSTEM

摘要

PROBLEM TO BE SOLVED: To judge calling from an intercom slave unit at a separated place without the need of new wiring. SOLUTION: This system is constituted of an interphone master unit 1 for connecting the intercom slave unit 3 and performing contact point output when the calling from the intercom slave unit 3 is present, a contact point input transmitter 4 connected to the interphone master unit 1 for transmitting wireless signals when the contact point output from the interphone master unit 1 is inputted and a wireless receiver 5 for reporting that the calling from the intercom slave unit 3 is present at the time of receiving the wireless signals from the contact point input transmitter 4.