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HD9084 HDTV Caption Encoder Manual
Page 4-18 SERIAL CONTROL PROTOCOL
The XDS article length is checked for the following commonly used articles: Program ID (0101), V-Chip
Content Advisory (0105), Station Call Letters (0502), and Time Zone (0704). If the article length is not
in the valid range for the packet type, the encoder will reject it. This length checking does not apply to
XDS packets from upstream, only XDS articles that are entered using the ^AP command from a serial
port.
Examples:
^AP<sp>0103<sp>10<sp>41424344<cr>
Sets the program name packet to ABCD and repeat packet ten times.
^AP<sp>0701<sp>9999<sp>456A4548474A<cr>
Time Of Day packet indicating the current UTC time is 10:05 am on Saturday, October
5
th
, 2002. DST is ON. The packet will be repeated indefinitely.

Time of Day and Time Zone articles behave differently than other XDS articles
when defined. The defined article contents will be ignored; the encoder will
generate the time of day packet data from the current internal time.
^AP<sp>0105<sp>9999<sp>486D<cr>
Program rating packet setting the rating system to “TV Parental Guideline”, rating of TV-PG with V
and L bits set. The packet will be repeated indefinitely.
4.5.2. Blocking Upstream XDS Packets
Upstream XDS packets can be removed entirely from the data stream, without having to insert new
XDS data of the same type. This is accomplished using a variation of the ^AP serial interface
command. This feature is particularly useful for removing unwanted Time-of-Day packets, Time Zone
packets, etc. off of pre-encoded material.
The manual does not attempt to provide a comprehensive list of valid XDS packet types. The reader is
encouraged to refer to the CEA-608 standard for the currently supported and required packet types.
For the V-Chip program rating packet, EIA-744-A serves as an addendum to CEA-608.
To remove a specific XDS packet, use the ^AP command to enter an XDS article with the packet id of
the packet you want to remove, a repeat count of 9999 and article text consisting of the single character
"R", or the equivalent ASCII HEX "52".
Examples:
^AP<sp>0701<sp>9999<sp>52<cr>
^AP<sp>0701<sp>9999<sp>R<cr>
Both variations block upstream Time Of Day packets
^AP<sp>0701<cr>
Allows upstream Time Of Day packets to be passed through.

Please note that the upstream XDS blocking instructions are not saved through
power loss.
USO
RESTRITO