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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.