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DE285 HD Caption Decoder/VANC Monitor
record triggers that will be stored on the DE285 for detailed viewing or
to view information about infrequently occurring errors, please see the
next section on Logging.
To set a trigger, select a DID/SDID value from the dropdown menu on the
left and then choose a specific event type from the adjacent drop down
menu. One of the following events can be chosen: "Present," which
triggers when a particular packet is present in the video stream, "Ab-
sent," which triggers when a packet is not present in the video stream,
"Change," which triggers when the packet presence changes from being
present to not present or vice versa, and "DataChange," which triggers
when the packet presence remains the same, but the data within the
packet has changed. The events are evaluated on a per–field basis.
After creating an ANC trigger, click on the Start button to monitor the
trigger activity. A pop–up window will appear with multiple columns.
The text in the upper left corner of the pop–up window indicates whether
the trigger is active or has completed.
If the trigger is set to go off when the packet is absent, then the pop–up
window will display the Trigger Count column and the Frame Number
that the packet was missing from. If the trigger event is set to go off
when the packets are present, changed or the data has changed, the
pop–up window will display the Trigger Count, the Frame Number that
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