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Action Control
Figure 8.1: Action Control Structure
Action signals are a method to send triggers to multiple cameras in a common network at the
same time. Four action signals are available in the Photonfocus GigE cameras. Each of them
can be used as a trigger for the image acquisition, counter and/or timer. The commands are
sent via the transport layer as a broadcast protocol message. The configuration parameters
ActionDeviceKey, ActionGroupKey and ActionGroupMask in the camera allow filtering of these
broadcast messages: The corresponding action signal is only asserted, when the received
broadcast message matches to its key and mask configuration.
The action command enables triggering of the camera with low latency and low jitter.
8.1 Action Command Usage
Each action command message comes with the following key and mask information, which is
necessary to validate the requested action signal:
ActionUnconditionalMode Enables the unconditional action command mode where action
commands are processed even when the primary control channel is closed.
ActionDeviceKey The ActionDeviceKey authorize the action in the camera. The camera reacts
only, when the received action message includes the correct action device key value. In
the camera ActionDeviceKey value is configured once and applied globally to all four
action signals..
ActionGroupKey The ActionGroupKey defines a group of devices on which the action has to be
executed. This enables an action command to be applied to a specific subset of devices.
Each action signal has its own group key, which need to be defined in the camera.
ActionGroupMask The ActionGroupMask filters out some of the devices of the group, which
are selected by the action group key. Each action signal has its own group mask, which
need to be defined in the camera.
The corresponding action signal is only asserted if:
•
the configured ActionDeviceKey is equal to the action device key in the message.
•
the configured ActionGroupKey is equal to the action group key in the message.
•
the logical AND-wise operation of the action group mask in the message against the
selected ActionGroupMask is non-zero.
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