Patent ID: 8723672
Filing Date: 2014-05-13
Classification: G08B,H04R

Abstract:
1. A method for automatic audible alarm origination locate, comprising the steps of: monitoring an input-output bus coupling together a spatially diverse plurality of hazard detection and alarm devices; detecting when the input-output bus at a first logic level goes to a second logic level; determining if the second logic level remains on the input-output bus for a first time period, wherein making a first one of the plurality of hazard detection and alarm devices in the local alarm condition a master device; asserting the second logic level on the input-output bus with the master device; asserting the first logic level on the input-output bus with the master device for short times between asserting the second logic level thereon; and synchronizing groups of alert tone pulses from the master, follower and slave devices, wherein alert tone pulse groups from the slave device will only occur when the input-output bus is at the second logic level.