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6
TROUBLESHOOTING
6.1
ANSWERS TO FREQUENTLY ASKED QUESTIONS
TROUBLESHOOTING
Models 8084/8084AD/8085 Closed Caption Encoder Manual
6.1.1
Which serial port should I connect to?
Any serial port can be used for typical captioning functions, since they all
use the same serial protocol. In the 8084and 8084AD, all three serial ports
are configured from the factory to work with an off-the-shelf null-modem
cable. Port A has a configurable pinout, but comes from the factory ready
to accept a null-modem cable. (In the 8074, Port A requires that a special
cable be made according to the instructions in the manual.) In some
models, serial ports B and C also have a configurable pinout and support
for RS-422 as well as RS-232 communications. If the user wishes to use
the special "port passthrough" or "VBI bridge" modes, serial port B must be
reserved for this purpose.
6.1.2
There is no SDI video being output from the unit.
The 8074, 8084 and 8084AD include an SDI video bypass relay to ensure
that SDI video is passed, even when the unit is powered-down. Make sure
that your SDI source is connected to the BNC connector marked SDI IN,
and the primary SDI video output is connected to the BNC connector
marked SDI BYPASS OUT. If you still see no video, try the following:
•
Unplug the power from the Closed Caption Encoder.
•
Connect your SDI source to the SDI IN connector.
•
Look for video out of the SDI BYPASS OUT connector.
•
If there is no still no SDI video passing through the unit, then the
problem is most likely not with the Closed Caption Encoder itself.
Check for presence of SDI video upstream, and check for cabling
problems.
6.1.3
There is valid input video but the front panel shows "VIDEO
MISSING".
The 8084AD reads upstream captions from either the digital video or the
analog video source, as determined by the UPSTREAM SOURCE setting
in the Setup menu system. If there is only one video source, either analog
or digital, it is important that UPSTREAM SOURCE is set correctly even if
the input video is uncaptioned. The 8084AD also locks internal counters to
the indicated video source.
Revision 1.6.6
Page 6-1
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