N93-586-84 Issue 04 AB Page 24 of 32 © Protec Fire Detection plc 2015
6.11 Setting Zones into Coincidence (Double Knock) Operation
Two or more zones may be programmed into coincidence groups. In this mode two or more of the
programmed zones must trigger in order to activate the alarm outputs.
If only one zone in the coincidence group triggers, the 3500 will flash the relevant zone fire indicator, sound
the internal buzzer and activate the global fire contacts. The user may then investigate the cause of the
alarm and manually activate the alarms in necessary. Operation of a Manual Call Point on a zone
programmed as coincidence will immediately activate the alarm outputs.
Sequence Effect
Enter the access level 3 code 'Access Level' indicator flashes
Press button '4' to enter the
coincidence menu
Zone 1 indicator flashes
Any currently coincidence zones illuminate steady
Press button '2' or '3' to cycle round
zones
Cycles through zones to be programmed into coincidence.
Selected zone flashes relevant indicator. Choices are:
Individual zones -> all zones
Press button '1' to enable
coincidence mode
Relevant indicator changes to steady
Press button '4' to disable
coincidence mode
Relevant indicator turns off
Press 'Enter' button to save and exit Saves current settings into memory and exits the menu
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