Contemporary
Research
20
ICC2-ATSC HDTV Tuner/Controller
Command
Description
Text
Write Text
DM “$A5,<dh>,<dl>,<ncb>,‘DM’, <start line>,<text color>,<text
background color>, <screen background>,<size and
shadow>,<timeout>,<message bytes>” (variable bytes)
Clears current text, displays text message over video (default) or blank
background. The built-in character generator can accept up to 40
characters of text (including carriage returns), 28 characters per line. Use
a hex $0D or decimal 13 in the text as a carriage return, which will
advance CG to the next line, first space on the right.
Start Line - 1-9
Text Color - 1-7= White
Text Background Color – 0-7=Transparent (no background)
Full screen background – 0=normal insert over video
Size and Shadow – 0-3=small text with drop shadow
Time-Out – 0=15-second display, 1=persistent
Persistent text stays on screen until the next DM, or new Menu or channel.
Ex1: “$A5,<dh>,<dl>,10,‘DM’, 2,7,0,0,1,0,’TEST’ ” displays the word
TEST on the second line, white text, inserted over video, small size with
drop shadow, and timing out after 15 seconds.
Ex2: “$A5,<dh>,<dl>,2,‘DM’ ” clears on-screen display, also clears
persistent text
The ATSC uses white text and clear backgrounds when it receives a Text
or Background Color parameter between 1 and 7, and accepts values 0-3
for text size and shadow. This allows compatibility with Smart TVs mixed
in the same system that can display other colors and fonts.
Return EB
“$A5,<dh>,<dl>,2,’EB’ ” (6 bytes)
Moves cursor down to the first column of the next row.
Text Timeout DQ “$A5,<dh>,<dl>,3,’DQ’, <time>” (7 bytes)
Sets screen timeout to specified time in seconds (1-254). If time is 0 or
255, any text on the screen will persist indefinitely, or until cleared.
