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Figure 46 ►
Triggering of multiple
cameras via trigger over
Ethernet (ToE).
34
5.7. Action Command / Trigger over Ethernet
The basic idea behind this feature was to achieve a simultaneous trigger for multiple
cameras.
Therefore a broadcast ethernet packet was implemented. This packet can be used to
induce a trigger as well as other actions.
Due to the fact that different network components feature different latencies and jitters,
the trigger over the Ethernet is not as synchronous as a hardware trigger. Nevertheless,
applications can deal with these jitters in switched networks, and therefore this is a com-
fortable method for synchronizing cameras with software additions.
The action command is sent as a broadcast. In addition it is possible to group cameras,
so that not all attached cameras respond to a broadcast action command.
Such an action command contains:
▪
a Device Key - for authorization of the action on this device
▪
an Action ID
- for identification of the action signal
▪
a Group Key - for triggering actions on separated groups of devices
▪
a Group Mask - for extension of the range of separate device groups
5.7.1.
Example: Triggering Multiple Cameras
The figure below displays three cameras, which are triggered synchronously by a soft-
ware application�
Another application of action command is that a secondary application or PC or one of the
attached cameras can actuate the trigger.