Comelit RAS_SOLUTION - Manual (Page 52)

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The Layout item has device items and each item shows the screen id.
9.3 Channel Sequence
The channel sequence item has device items. And the order of the devices is the sequence order.
Figure 44 Channel Sequence Item
9.4 Layout Sequence
The layout sequence item has layout items. And the order of the layouts is the sequence order.
Figure 45 Layout Sequence Item