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6
TROUBLESHOOTING
6.1
ANSWERS TO FREQUENTLY ASKED QUESTIONS
TROUBLESHOOTING
8083XDS-AD Analog and SD-SDI XDS Encoder
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 8083XDS-AD, 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. 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 8083XDS-AD includes 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 XDS 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 XDS 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 8083XDS-AD reads upstream XDS data 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 8083XDS-AD also locks internal
counters to the indicated video source.
6.1.4
What baud rate and port settings should I use?
While the unit is capable of running at 38.4kbaud on all internal serial ports,
it is not necessary to run at the fastest baud rate possible for most
captioning operations. NTSC captions are encoded at a maximum of 60
characters per second in each field and 50 characters per second per field
for PAL. A serial port set to 1200 baud can transfer data at up to 120
characters per second including 7-bits of data, start, stop and parity bits.
This is adequate for most captioning applications; the communications
overhead is generally very low.
Revision 1.0.2
Page 6-1
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