Alarmsystem för trådlöst sammankopplade enheter

摘要

The units (A-C) are configured to be used in a personal wireless communication network and automatically check to see if the other units in this network are contactable at regular intervals. - A first unit can send a first control message to a second unit and the latter can send a first reply message to the first unit in response to the first control message. The second unit can send a second control message to the first unit and the latter can send a second reply message to the second unit in response to the second control message. At least one unit can generate an alarm if it does not receive a reply message.