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Node Control (Request/Grant/Deny)
Functionality overview
As per Section 4.16.1 of the ULC standard the Voice Alarm Feature (Paging), the phone
system and some manual control switches should only be operated from one location at
any given time. In a multi-node setup, this is accomplished by having a display and control
centre take over control of the system. Indication at the rest of the centres is provided as to
which is in control.
Furthermore, centres which are not currently in control can make a request to take
ownership of the system. It is up to the operator at the controlling centre to decide whether
or not control shall be transferred. A means for fail-safe auto-transfer from one command
centre to another should also be provided.
System configuration
The following is required at every control centre:
QAZT-5302DS switch adder
• A switch correlated to the local node:
o Used for requesting and releasing control at this node
o When the green LED for this switch is OFF, the node is not in control, when it
is ON the node is control
• Switches correlated to all remote control centres:
o Used for granting control to remote nodes
o When the green LED for any of these switches is blinking, the corresponding
node is requesting control
Procedure for configuring a Node Control switch in Configurator:
• Add a Telephone/Page Selector display adder
• Select a switch and set its type to Node Ctrl
• Right click on the switch, select Add Correlations and choose a node from the list
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