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1.8 Alarms and Alerts
The following section details the use cases when an alarm or alert will be instigated on the wireless
network.
1.8.1 Gas alarm
A Gas Alarm is initiated when a De unit detects gas and goes into alarm, De beacon
and lights will then be in operation.
A Gas Alarm will cause the locally attached Detective Net device to transmit an alert to all other
wireless devices on the network causing all other De units to initiate a Network Alert (see
The locally attached Detective Net device will indicate a gas alarm event by a single flash on LED3.
1.8.2 Network Alert
A Network Alert is a response of a specific De to the fact that another De unit in the
network is in Gas Alarm (or that a Det on the network has turned off due to an exhausted
battery).
A Network Alert received by a Detective Net device via the wireless network shall activate a Network
Alert on the locally attached De. This will cause the De to go into Network Alert, the
beacon and lights will flash at a slower rate than a Gas Alarm to differentiate it from the De
that is in Gas Alarm.
i
Dependant upon the deployment configuration a Network Alert may take a number
of seconds to be initiated on all De units as the alert message propagates
throughout the network.
i
The locally attached Detective Net device will indicate a Network Alert by a double flash
on LED3.
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