Hall Research TVB-400A - Manual (Page 14)

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TV-to-VGA / HDTV Video Scaler
4.2 Using the Control Software
 The first time the application software is run, you must select
the appropriate COM port that the unit is connected to. The
software will retain this information when executed in the
future.
 The AV Settings and Adjustment windows are by default not
displayed. Click the button to open or close the panel.
 The ‘PC Loop Bypass’ must be enabled (which is the default
setting) in order to bypass the PC IN signal to the OUT
connector. When the ‘PC Loop Bypass’ is disabled, the ‘PC
BYPASS’ button is grayed out and the selection disappears
from the OSD.
 On the TVB-400A, when ‘PC BYPASS’ is selected, the only
valid adjustment is ‘VOLUME’.