AJA FS1 Version 2.2.0.47 - Manual (Page 100)

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Caption Screen This screen controls how the FS1 handles closed captioning ancillary data and whether
it and VITC timecode are passed to the outputs or blanked.
Caption Translator (30.1)—When set to On and using the Upconverter, the FS1 will
automatically translate incoming line 21 captions to CEA-708 format and insert the
VANC packets into the converted HD video stream. This is a complete translation
from CEA-608 format to CEA-708 format (including the embedded SD captions).
When set to On and using the downconverters, the FS1 will automatically intercept
and reformat the SD caption data in the incoming CEA-708 VANC packets, and
output it on line 21 of the standard definition outputs.
When Off, translation is not performed.
Upconvert Line 21 (31.1)
Captioning Status—This field is a read-only informational display that shows whether
Closed Caption data is present on the currently selected video input.
FS1 Web Interface, Caption Screen
Blank (default)
Pass
Auto blank
In UpConvert or SD Aspect Ratio Convert modes, this setting blanks input video Line 21
before conversion. This is used to blank Line 21 caption data.
Passes input video Line 21 to the converter and to the outputs.
The FS1 looks for Line 21 caption data on the video input. If present, Line 21 is blanked
before video conversion occurs. If no caption data is found, Line 21 passes to the
converter.