HD491 Smart Encoder
Copyright © 2000-2014 EEG Enterprises, Inc. 26
All Rights Reserved.
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.
Load Default XDS Packet
<CTRL+A>P L
Packet
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 packet (two Space characters),
the Encoder will continue insertion of the discontinued packet for a time-out
period of 5 minutes to ensure continuity during commercial breaks or
replacement delays. The default packet will then be transmitted until the
upstream packet is replaced.
