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PGR Dragonfly Technical Reference
3.3.
Automatic Inter-Camera Synchronization
Multiple Dragonfly’s on the same IEEE-1394 bus are automatically synchronized to each other at
the hardware level. When using multiple cameras, the timing of one camera to another camera is
as follows:
•
•
If the cameras are on the same bus, the cameras are synchronized to within 125µs
(microseconds) of each other (please note: 125µs is the maximum deviation). However,
the 1394 bandwidth limits the maximum number of cameras that can be on one bus.
If the cameras are on separate buses, a PGR Sync Unit is needed to synchronize the
buses. The Sync Unit can synchronize cameras on different buses within the same
computer, or on different buses across multiple computers. This device will ensure that
the cameras are synchronized to within 125µs. If there is no sync device, there is no
timing correlation between separate cameras on separate buses.
Revised 29-Sep-04
Copyright (c) 2004
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