Extron Electronics VN-Matrix 250 User Guide - Manual (Page 65)

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The Genlock control allows the display output of multiple decoders to be coordinated
and creates a genlock group. One VND 250 device is selected as the timing reference
for the output of all the other VND 250 devices in the same decoder genlock group. The
genlock output from the chosen reference device is connected to the other decoders in
a daisy chain architecture.
A network‑based protocol enables the chosen VND 250 to coordinate the frame timing
so that all decoders display the same frame simultaneously.
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One decoder is selected as the reference (master) unit, and provides the genlock
signal that is used to synchronize all the other units (slaves).
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The Genlock setting on the master device must be disabled.
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The Genlock setting on the slave devices must be enabled.
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The name of the master device must be selected from the Framelock Ref
drop‑down list on all devices in the genlock group (see Framelock ref below).
Framelock Ref (see figure 41 3 ) controls membership of the decoder genlock group.
Each member of the group is selected to have the same genlock master, including the
master itself. When such a group is formed, a network‑based protocol is used to permit
the master to coordinate frame timing so that all decoders are showing frames captured
at exactly the same times. This requires the separate enabling of the genlock feature, as
described above.
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The Clean Switch feature allows glitch free transitions when switching between
decoded streams that may have different resolutions and frame rates. Select the check
box to activate this option.
NOTE: When using Clean Switch mode, the scale option must be checked and
the required output mode must be selected in the Output Format drop‑down
list. Clean Switch is not supported when switching to an image from a recorded
stream.
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The VND 250 fully supports HDCP. Source images that are HDCP encrypted can only
be displayed on an HDCP compliant display. Selecting the
HDCP Mode option forces
HDCP encryption for all stream types. An HDCP compliant display must be used when
this option is enabled. If not, a full green screen is displayed for all video streams.
NOTE: Setting this mode will improve the Clean Switch performance in systems
where it is necessary to switch between encrypted and non‑encrypted stream
types.
The Active Format reports the current output mode being used on the display.
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When the Output Format is set to auto , this field reports the source format for the
current stream.
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When the Output Format is set to monitor , this field reports the source format that
has been selected from the EDID of the currently connected display.
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When the Output Format is set to fixed , this field will report the same mode.
Assigning a video source stream
In a system with multiple encoders, each decoder in that
system potentially has access to multiple video streams.
To assign a specific source stream to a decoder select
one of the available source streams from the video
source drop‑down list (see the figure to the right).
VNM 250 • VNM 250 GUI Overview 59