TES9 Software User Manual (Iss. 04)
Appendix B. Captioning Commands • 10–7
To insert the specified string in the proper Text channel, the encoder automatically precedes the
string by a Text Restart command. The values used for the 2 byte Text Restart command depend
on the selected channel, as outlined in
The Text Restart command clears the portion of the screen used for Text display and sets the
cursor to the upper left corner. This means that if the user of a caption decoder selects the Text
channel being used for the insertion of the URL, the URL is displayed in the upper left corner,
with the rest of the Text area remaining blank.
The URL being encoded can be changed at any time simply by sending another “N_T” command
with the desired parameters, as described above.
It should be noted that the checksum at the end of the string, as described in CEA-608 and
EIA-746, is not generated by the encoder; it must be sent by the host computer.
Stop Encoding Text Data
Format: <CTRL-A> N_T <CR>
This command stops encoding the text data. After this command is received, the data channel
which was being used for the text data is restored to its previous state (ON or OFF).
Start Encoding XDS Data (Interval Packets)
Format: <CTRL-A>P{packet type} {repeat count} {data} {delay} <CR>
This command starts inserting, on a cyclic basis, the specified XDS packet. The packet is referred
to as an Interval packet since it is inserted once for every interval given by the {delay} parameter.
The parameters are outlined in
.
Table 10.5 Text Restart Command
Channel
Text Restart Command (hexadecimal)
T1
14, 2A
T2
1C, 2A
T3
15, 2A
T4
1D, 2A
Table 10.6 Start Encoding XDS Data
Parameter
Description
{packet type}
4 digit hex number, where the first two digits
represent the class of the packet and the second two
digits represent the type of the packet. Note that there
must be no space between the 'P' and the packet type
parameter.
{repeat count}
number of times (in hex) to send the packet. A value
of -1 or FFFF indicates that the packet should be
repeated forever.
{data}
ASCII encoded hex values representing the data in
the packet, or the actual displayable data enclosed in
curly braces.
{delay}
number of video frames (in decimal) to wait between
each insertion of the packet.
