VAR4 / VAR12 / VAR20 - Operation Manual
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Page 203 of 308
4. Move to, and select the Control menu item:
sue: 03 complete, approved
14.2.3 Configuring a Routing Contact for Latching Mode
A momentary, or prolonged, activation of a ‘Routing’ contact configured for Latched mode initiates a route;
and activating the associated reset contact terminates it unless the corresponding trigger is still asserted.
This method is used normally to trigger emergency DVAs although any input source may be routed in this
way. For Fire Alarm DVA messages, BS5839 Pt.8 recommends the use of latched triggers with separate
resets so that the message will continue to run even if the trigger pair fails.
Each latching trigger is configurable to initiate routing of any DVA to any output. It is possible to initiate
simultaneous routing of multiple DVAs to multiple Outputs. This is so that, for example, ALERT and
EVACUATE messages may be broadcast to different zones by a single trigger. The DVA(s) will play until a
momentary assertion of the matching reset contact, unless the corresponding trigger is still asserted, in
which case the DVA will not be reset.
A group of route triggers may share a single reset, or each route trigger has its own dedicated reset. If
multiple DVA routes have been triggered by consecutive triggers in a single group, the activation of that
group’s reset contact unlatches all the DVA routes associated with that reset. However, if any of the triggers
are still asserted, these DVA(s) routes continue to play while the others will be reset.
In order to configure a ‘Routing’ contact for ‘Latched’ mode proceed as follows.
1. Select ConfigurationÆSystemÆRouterÆControlÆContacts.
2. Move to, and scroll the contact list until the required contact is displayed in the left field:
[Contact#nn] Routing Not-Surv
Default value: ‘Contact#01’
Contact numbers: 01 to 22 for VAR4
01 to 42 for VAR12
01 to 62 for VAR20
Where contacts: 00 to 10 are analogue
11 to 62 are opto-isolated
3. Press the SELECT key to display the routing configuration menu.
Zoning [Control] Clear-all
5. Move to, and select the Latching menu item:
[Latching] Busy=On DVA-Full
6. Move to, and toggle to the ‘Mode=Latched’ mode in the left field:
[Mode=Latched] ResetContact --
When this mode is selected, the reset contact list on the right side is scrollable for selection.
Other options available:
• [Mode=Not Latched]
Configures the contact for non-latching mode.
See Section “14.2.2 Configuring a Routing Contact for Non-latching Mode”.
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