CRIME PREVENTING RECEIVER, CRIME PREVENTING SYSTEM USING THE SAME, AND ROOM ENTERING AND LEAVING MANAGEMENT SYSTEM

摘要

PROBLEM TO BE SOLVED: To make confirmable the state of terminal equipments in real time by restricting the equipment to which a state signal can be transmitted and preventing a data collision in communication. SOLUTION: The crime preventing receiver 1 transmits a transmission permitting signal only to terminal equipments 2-6 which permit the transmission of the state signal and inhibits the transmission of the state signal from the other terminal equipments 2-6. Thus, the state signal cannot be transmitted from the equipments which do not transmit the transmission permitting signal so that the data collision does not occur only when the equipment which permit transmission are restricted.