Automation Technology C5-1280CS14-120, User Manual

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C5-CS Series User Manual Rev. 1.6  57
The Chunk Data Mode of C5-CS-GigE
General Description
The C5-CS-GigE features a Chunk Data mode for providing additional information to the
acquired image data. The implementation of XML nodes is performed according to SFNC
1.4:
 Category ChunkDataControl
 ChunkModeActive
 ChunkModeSelector (OneChunkPerFrame, OneChunkPerProfile)
The ChunkData generated by the camera have the following format:
 ChunkImage
 1…N x ChunkAcqInfo
 ChunkImageInfo
Depending on camera mode (image or 3D) the ChunkData block („ChunkAcqInfo“) can
be sent as follows:
 In image mode, the camera can send only one ChunkAcqInfo block per image
frame.
 In 3D mode, the camera can send one ChunkAcqInfo block either per 3D frame
(“OneChunkPerFrame”) or per 3D profile (“OneChunkPerProfile”).
The „ChunkImageInfo“ is the last ChunkData sent by the camera and contains following
data:
 Number of valid rows in ChunkImage
 Number of valid ChunkAcqInfo blocks
 Flags identifying the current frame as „Start“ or „Stop“ and the buffer status in
AutoStart mode
The ChunkAcqInfo block consists of totally 32 bytes containing following data
 64 bit timestamp
 32 bit frame counter
 32 bit trigger coordinate
 8 bit Trigger status
 32 bit I/O Status
 72 bit AOI information
The data of timestamp, frame counter, trigger coordinate, trigger status and I/O status
are assigned at the start of every image integration.
When ChunkMode is disabled, the camera uses the “regular“ GEV image protocol, in
which the optional transfer of frames with variable height and payload is supported.
Furthermore, when ChunkMode is enabled, the camera sends the full payload, even if
the ChunkImage or ChunkAcqInfo blocks contain partially valid data. The number of
valid ChunkImage rows and ChunkAcqInfo blocks can be read from ChunkImageInfo.