HD491 Smart Encoder
29 Copyright © 2000-2014 EEG Enterprises, Inc.
All Rights Reserved.
URL and Text Encoding
The Smart Encoder handles URL and Text Encoding, like XDS, as an
output from memory function, rather than a real time flow function. The
Encoder can store up to 24 separate text messages and interactive
television URLs in RAM storage indefinitely. Messages in storage may
be transmitted in any sequence and repeated any number of times in either
Field 1 text channel. However, both channels cannot use the same
message simultaneously. Once insertion of a message begins, upstream
data on that Text channel is blocked until the locally inserted message is
completed. The URL insertion protocol operates in T2 and is fully
compliant with CEA-608B specifications.
Begin Message Input
<CTRL+A>0
Title
[
Channel
] [
Repeat
] [
K/D
] [
O/H
] [
N/L
] <ENTER>
End Message Input
<CTRL+C>
To load a new message, enter the Begin Message Input command. The
character following <CTRL+A> in the Begin command is a zero. The
Encoder should respond with “>” as a prompt at the beginning of the
message and at the beginning of each new line. Enter the message text,
ending each line with a carriage return (0Dh or <ENTER>). For URL
insertion, be certain to observe the format defined in CEA-608B, which
includes specific ordering, punctuation, and a checksum. When the
message is finished, enter a final carriage return, and then the End
Message Input command.
To insert a transmission delay within the message, insert the command
<CTRL+B>
Delay
at the desired point, setting Delay equal to the length
of the desired delay in seconds.
Title
sets the title of the message. The title will be used to identify
the message for future use.
Channel
sets the Text Channel queue (T1 or T2) into which the
message will be inserted. T1 is the default.
Repeat
sets the integer number of times that the message will be
repeated when it arrives in the queue. All messages in the queue are
cycled, and any message that has not reached its Repeat count
returns to the end of the queue line after it is inserted. The default
setting is infinite repeat (listed as FFFF in a status display).
K/D
specifies whether the article is to be Kept in memory or
Deleted once it exits the queue. The default setting is Delete.
