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When Clusters are created in PADS4 CTRL Center, system-defined Viewer Variables are automatically available. These variables help control content distribution across Clustered Viewers based on their position and availability.

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System-defined cluster viewer variables

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Example cluster configuration

The example below illustrates a 2x2 Cluster with 4 Viewers.

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How these variables work in a cluster

  1. Dynamic Page Assignment:
    • If Viewer 2 goes offline, Viewer 3 or Viewer 4 will automatically take over its content.
    • If a Viewer is removed or disabled, PADS4 automatically reassigns the correct page positions.
  2. Intelligent Content Distribution:
    • HorizontalPosition ensures content is evenly distributed when a Viewer is removed.
    • VerticalPosition helps determine which upper Viewers’ content moves down if a screen fails.
  3. Flexible Layout Customization:
    • IndexX/IndexY allow precise control over the placement of Viewers within a Cluster.
    • Adjustments can be rule-based, ensuring smooth failover handling.

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Practical use cases

  • Airport Flight Information Displays: Ensures continuous flight listings across multiple screens.
  • Menu Boards in Restaurants: Automatically shifts menu content if one screen fails.
  • Retail Digital Signage: Prevents content gaps and adjusts layout dynamically.
By utilizing these Cluster Viewer Variables, you can optimize digital signage layouts, reduce downtime, and automate content distribution across your PADS4 system.