Interconnections
Edit Controller Hookup
An edit controller or video switcher controls the DAFV
2
through a serial port. The
port may be on a plug-in card or outboard interface box. Some edit controllers have a
dedicated port just for an audio mixer.
Other edit controllers have a dedicated port just for a video switcher. By means of a Y-
cord, DAFV
2
can “eavesdrop” on that port. The audio transition would occur when
the edit controller sent a dissolve or cut command to the video switcher.
Edit controller interface cables are not standardized. Interfacing the DAFV
2
to your
edit controller or video switcher may require special skills in making cables, and
reading manufacturers’ technical documentation.
Larger facilities will defer this chore to their engineering departments. If you do not
have the experience to attempt to make the interface cable, we recommend that you ask
your dealer to help you find a video service center that you can contract to assist you.
Video Switcher Hookup
DAFV
2
can get its commands from a “Y” cord, listening in on the commands to a
video switcher. This is the case when an edit controller does not have a separate serial
port available.
When a command is sent to a machine via a serial protocol, the machine replies with a
message of acknowledgment. But in this case the video switcher will reply with a
message of acknowledgment. Therefore, transmission of acknowledgment messages
from DAFV
2
must be blocked, so that these messages do not collide with the acknowl-
edgment messages from the video switcher.
To disable the transmission of acknowledgment messages, make sure that the Y-cord
leaves the DAFV
2
’s output pins 2 & 7 disconnected.
Sync
Connect the BNC connector to a source of Composite Video or Black Burst. This is
sync connection is optional, it is not required that this be connected to operate the
DAFV
2
.
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