Specifications

C4-1280-GigE Camera Hardware Reference Manual Rev. 1.8 • 41
The Chunk Data Mode of C4-1280-GigE
General Description
The C4-1280-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 identifing the current frame as „Start“ or „Stop“
The ChunkAcqInfo block consists of totally 32 bytes containing following data
• 64 bit timestamp
• 32 bit frame counter
• 32 bit trigger coordinate
• Trigger status
• I/O Status
• reserved
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.