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Figure 46 ►

Triggering of multiple

cameras via trigger over

Ethernet (ToE).

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.