
© Optoma
Issue 2.1 July 25, 2018
47
6.2.1.3
I/O Lock
From this menu, the user selects the I/O lock mode of the generated output frame sync. There are 3
choices to select from: I/O Lock, Genlock or free run. The selected mode is displayed on the front LCD
panel.
6.2.1.3.1
I/O Lock = Off
If I/O Lock is set to “off” and the frame rate is a fixed value (60, 59.94...), the output sync free-runs at a
fixed rate determined by the frame rate fixed value setting. Switching between the different inputs is
clean without any artefacts.
If I/O Lock is set to “off” and the frame rate is set to “auto”, the output sync runs at the same rate as
the selected input source rate. Switching between the different inputs is clean if the rates between the
two sources are the same or close (example: 59.94Hz vs 60Hz). If the rates are not close (50Hz vs
59.94Hz) switching will not be clean and will take few seconds.
In this mode, the generated output vertical sync will deviate slightly from the input vertical refresh sync
or genlock signal, even if both rates are at the same rate. This occurs due to the frequency deviations
between the different parts that create the sync signals. So even if two frame rates are 59.94Hz, there
is a slight miniscule timing difference between the two signals. This miniscule difference, will
occasionally cause frame dropping or repetition.
6.2.1.3.2
I/O Lock = On
If I/O Lock is set to On, the output refresh rate follows the input video refresh rate. If a lock condition
cannot be achieved and the frame rate is a fixed value, then the output refresh rate determined by the
frame rate setting. If the Frame rate is set to auto, the output rate is set to 59.94Hz.
In this mode, switching between the different inputs is not clean and will take few seconds.
6.2.1.3.3
I/O Lock = Genlock
If I/O Lock is set to Genlock, the output refresh rate will follow the vertical sync of the signal
connected to the Genlock BNC connector. Genlock is achieved when the Genlock vertical sync rate
matches the vertical sync rate set in the output menu. Valid combinations are 50Hz/50Hz,
59.94Hz/59.94H and 60Hz/60Hz. If genlock is not achieved, the output frame rate refresh rate is
determined by the frame rate setting.
To achieve clean switch between input selections, follow the locking settings described in the table
below.
Setting the I/O lock mode to Genlock and the Frame rate to Auto is not a valid
combination
Содержание LS200
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