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EXT SYNC
HOW TO USE EXT SYNC
The External Synchronization, (EXT SYNC), feature permits the
user to control the start time of every frame recorded. The
external synchronizing signal from the user is input through the
EXT SYNC IN connector on the rear of the Processor. The signal
supplied must be TTL compatible. Don't worry about the polarity
of the signal as the Processor has a means of changing the
polarity if needed.
For EXT SYNC operation the synchronizing signal need only
change state to read a picture into memory.
When the EXT SYNC feature is being used EXT SYNC appears on
the right side of the DATA-FRAME Border. When the Processor
senses an external synchronizing signal a solid white box appears
for a moment to the right of the EXT SYNC field in the DATA-
FRAME Border. This white box or EXT SYNC Indicator is driven by
the user's synchronizing signal. If the EXT SYNC indicator be-
haves just the opposite of what you expected, the polarity of the
command signal needs to be changed.
There is a switch labeled INVERT next to the EXT SYNC IN connec-
tor. Change the position of this switch to change the polarity of
the external synchronizing signal. The EXT SYNC Indicator should
now behave, and come on when you want it to.
6.16
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