10–6 • Appendix B. Captioning Commands
TES9 Software User Manual (Iss. 04)
Set Transparent Mode
Format: <CTRL-A> 7 {field} <CR>
This command causes the upstream caption data, in the field specified by the {field} parameter, to
be decoded and re-inserted into the outgoing video.
Turn Off Channels
Format: <CTRL-A> 6 {channels} <CR>
This command causes all upstream data in the specified channels to be discarded.
Turn On Channels
Format: <CTRL-A> 7 {channels} <CR>
This command causes all upstream data in the specified channels to be decoded from the
upstream video and re-inserted into the outgoing video signal.
Start Encoding Text Data
Format: <CTRL-A> N_T {string} {text channel} I={interval} D={duration} <CR>
This command starts the periodic insertion of data into a Text channel, and is designed to allow
for the transport of Internet Uniform Resource Locator (URL) information using the T2 Text
channel, according to specifications CEA-608 and EIA-746.
This command can also be used as a replacement for the N_V command, to insert V chip ratings
in the Canadian format.
The parameters are outlined in
After this command is received, all upstream data in the specified Text channel is discarded, and
the specified string is inserted on a cyclic basis, with the specified time interval between
successive insertions. The string is inserted until the time specified by the duration expires. If a
duration with no colon is specified, then it is assumed to be in minutes. If a duration of -1 is
specified, then the string is inserted forever. If any of the {text channel}, {interval} or {duration}
parameters are not specified, then the default for the omitted parameter is used (channel = T2,
interval = 5 seconds, duration = 240 minutes).
Table 10.4 Start Encoding Text Data
Parameter
Description
{string}
string of displayable characters to be inserted,
enclosed in delimiting characters (any printable
characters can be used). The maximum length of this
string is 256 characters.
{text channel}
text channel to use (T1, T2, T3 or T4)
{interval}
time interval, in seconds, between each insertion of
the string
{duration}
length of time for which the string is to be inserted, in
the format “mmm:ss”, allowing times up to 999
minutes, 59 seconds.
