EEG HD490 Manual page 28

Load Default XDS Packet
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 Duration sets the transmission duration of the newly created packet.
When a packet's duration period expires, it will be deleted from the
XDS queue. A duration setting of –1 will cause the packet to be
inserted until it is deleted by a future command. An integer setting
(i.e. 100) will be interpreted as the number of times to output the
packet before deleting it. An Elapsed Time setting (i.e. 00.45.00),
will cause the packet to be inserted for that length of time, beginning
when the command is entered, and then deleted.
 Content sets the information content of the packet. Content can be
entered in ASCII text enclosed in curly braces, { }, or in ASCII Hex
notation. If you enter data in ASCII hex mode, you must only use
ASCII hex characters between 0x20 and 0x7f. A checksum need not
be enclosed, as the Encoder will calculate it automatically before
insertion.
 Priority is an optional parameter that allows the output priority of a
packet to be customized. The parameter should not be used for
standardized, commonly used packets, which the Encoder
automatically assigns appropriate priorities. The parameter is useful
for custom, user-defined packets. The default priority for packets
that the encoder does not recognize is 115, which corresponds to a
fairly low priority. A typical high priority value is 30. A packet's
numerical priority is inversely proportional to the frequency with
which it is inserted.
Two sample XDS entries follow.
<CTRL+A>P 103 –1 {Evening News} <ENTER> will load and begin
insertion for a current program name packet reading "Evening News."
The packet will be output until a new packet is entered.
<CTRL+A>P 105 00.30.00 4844 <ENTER> will load and begin
insertion for a current program rating packet of TV-PG. The packet will
be inserted for the next thirty minutes. Refer to CEA-608B for a listing
of hex codes for other possible program ratings.
<CTRL+A>P LPacket Duration Content [Holdoff] <ENTER>
Loads an Upstream Priority XDS packet. This is called a "default"
packet because it will be output only when no XDS packet of the
specified Class and Type is present in the incoming video signal. When
an upstream packet is discontinued without a replacement or a Clear
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HD490 Smart Encoder