Crowcon Detective Net, User & Operator Manual, Page: 29 / 40

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1.9 Network Operation
The following section details operation of the wireless network including scenarios that may be
encountered during normal operation.
1.9.1 Normal Operation
In normal operation the wireless network should operate unobtrusively.
If the network is functioning correctly all slave devices and the master device will be flashing LED2
green (the master device will continue to flash LED4 green indicating its master status).
A gas event on a De will cause that unit to go into Gas Alarm (see Section 1.8.1 ) and the
locally attached Detective Net device will initiate a Network Alert (see Section 1.8.2 ). This will cause
all De units on the wireless network to go into Network Alert.
1.9.2 Loss of Connection to Wireless Network
If Detective Net device loses connection to the wireless network, for example if an obstruction is
placed between devices after deployment, it will indicate this to the user.
If a slave Detective Net device has lost connection to the master device, it will double flash LED2
amber to indicate that connection has been lost and that it is attempting to re-establish connection.
Detective Net will attempt to re-establish connection at regular intervals.
The master Detective Net device will indicate a slave device has lost connection and is attempting
to re-establish connection by a double amber flash on LED2. It must be noted that due to the
mechanism of the wireless network it may take several minutes for LED2 on the master to be
illuminated amber.
If a slave device cannot re-establish wireless connection to the master, LED2 will flash red to
indicate that network connection has been lost and this will initiate a Modulated Alert (see Section
1.8.3 ) on the locally attached De unit.
The master Detective Net device will indicate a slave device has lost connection and is attempting
to re-establish connection by a double amber flash on LED2. It must be noted that due to the
mechanism of the wireless network it may take several minutes for LED2 on the master to be
illuminated amber.
Detective Net will continue to attempt to re-establish connection but at reduced intervals and after
approximately 13hrs it will cease trying to re-establish connection and power down. De
will remain powered until its on battery becomes depleted. Detective Net will continue to keep the
locally attached De in Modulated Alert throughout the 13hr period (if De has sufficient
battery life).
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