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MultiCam Boards Documentation > MultiCam Documentation > MultiCam User Guide > The Channel Class > Using Line-Scan Acquisitions > Web Operation > Web Acquisition Sequence

Web Acquisition Sequence

Once the Web acquisition sequence is started, the frame grabber acquires data lines continuously until the acquisition sequence is stopped.

The acquisition sequence is composed of one or more acquisition phases. During an acquisition phase the frame grabber stores data lines into one destination surface.

Destination surfaces contain an arbitrary number of lines as defined by parameter PageLength_Ln. For more information, see "Selecting optimal PageLength_Ln".

When a surface is filled, the acquisition continues automatically into the next available surface without any missing lines. This process repeats until a stop condition occurs.

Every time a surface is filled, the "MC_SIG_SURFACE_FILLED" signal is reported to the user. Parameter LineIndex reflects the number of lines already written in a partially filled surface. If SeqLength_Ln is not a multiple of PageLength_Ln, the last surface will be partially filled. A new surface is selected at each begin of acquisition phase.

Lines are acquired at a rate defined by the line trigger condition. When object speed is variable, it is convenient to generate a line trigger derived from a motion encoder. For more information, see "Line trigger condition".