DE285 HD Caption Decoder/VANC Monitor
ing present to not present or vice versa, and “DataChange,” which trig-
gers 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 selecting a value for DID/SDID and Trigger On, click
Add
to begin
logging occurrences of the Log Trigger.
To set any of the Alarms, click the box to the left of the desired Alarm.
After selecting all Log Triggers and Alarms of interest, click
Apply
and
then
OK
to begin logging the selected Log Triggers and Alarms and to
return to the Log Viewer. To disregard the changes made, click
Cancel
to return to the Log Viewer.
The available alarms are grouped into three categories: General Alarms,
Caption Pair Alarms and Error Alarms.
General Alarms
There are five alarms in the General Alarms category that can be used
to get an overview of possible problems.
Alarm Name
Description
Unknown Packet
Sets an alarm to go off when a packet cannot
be recognized by the DE285 as a known type.
AFD on Multiple Lines
Sets an alarm that goes off when there is
more than one AFD packet in a single video
field.
No Video
Sets an alarm that goes off when there is no
video signal or the video cannot be displayed.
Invalid V-Chip Rating
Sets an alarm that goes off when the V-Chip
rating is not present or is not valid.
No Captions
Sets an alarm that goes off when there is no
6101 VANC packet present.
Caption Pair Alarms
There are five alarms in the Caption Pair Alarms category that can be
used to detect when certain combinations of caption channels are active.
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