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Line-scan Triggers Synchronization

Start-of-scan and end-of-scan trigger synchronization mechanism to ensure that all the cards of the DF-chain capture the same lines of image data

In a DF-chain, the DF-master card forwards its start-of-scan and end-of-scan events to the DF-slave cards.

The generation of the start-of-scan and end-of-scan events on the DF-master is achieved in the same way as for non-data-forwarding Coaxlink cards. Refer to Line Scan Acquisition for more details.

The DF-master card:

  • First, synchronizes the asynchronous scan triggers on the next start-of line image data.
  • Then, share the synchronized scan triggers with all the DF-slaves.

The sharing of the scan triggers is achieved by the insertion of high-priority "custom GPIO messages" in the bit stream. These messages are forwarded by all the DF-slaves together with the image data.

On reception of such a message, the DF-slave generates a hardware event. Two kind of events are possible:

  • Start-of-scan event.
  • End-of-scan event

These events are available through the EIN tools of the I/O Toolbox.

For applications requiring synchronized line-scan acquisition, the I/O toolbox EIN tools of the DF-slaves must be used as local start-of-scan and end-of-scan trigger sources.