Double Knock.
Double knock operation is programmed on site installer and is used to prevent unnecessary
evacuation of the site. Two fires are needed from the selected list before the output condition is
satisfied and the output can operate. A Delay time cannot be used on stage 1 at the same time as
Double Knock. Version 3.0.8.12 (Aug 20) forbids this by only allowing either to be selected.
The operation can be done by address, zone or global. Later versions have included the opportunity
to double knock WITHIN an individual zone (any zone 2 devices)
When selecting the trigger to be by address all the addresses have to be on the same loop and the
limit is sixteen.
When selecting the trigger to be by zone, then the limit is sixteen zones, (or groups) in each stage.
Selecting by zone means that two different zones will have to be in fire before the output condition is
satisfied.
When selecting the trigger to be global then any two fires on that panel or network will satisfy the
output condition.
If a Cascading timer is used (Release Feb 2015) any outputs using DN global will respond on the first
cascade. If DN global is required use DN any zone group and choose all zones except the cascade
timer zone.
NOTE If Double knock is set by zone – any 2 devices within the same zone will NOT satisfy
the condition.
Coincidence (Dependency type C).
Coincidence is different from double knock in that two fires from the allocate device list are required to
satisfy the output condition but one fire from outside the list will also satisfy the output condition.
This function is similar to double knock in the way that it is set up i.e. by address, by zone and has the
same restrictions on the number of trigger devices.
NOTE If Coincidence is set by zone – any 2 devices within the same zone will NOT satisfy the
condition.
Sounder Level Test.
This option allows for db readings to be taken without causing too much disruption to the site
occupants.
Selection of the sounder level test mode turn the sounders on for 15 seconds enabling a reading to be
taken and then turn them off for 30 seconds allowing the engineer to move on to the next area.
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