Automation Technology MCS 1280 Series, User Manual

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52 MCS Manual Rev. 1.4
Chunk Data Mode
General Description
The sensor 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
•
88 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.
For example, when in Start/Stop mode with instant frame transmission, the camera stops the
frame acquisition as soon as the stop trigger occurs and transfers the complete contents of internal
image buffer. Using the ChunkImageInfo data block, it is possible to detect how many image rows
and ChunkAcqInfo blocks are valid in the payload buffer.