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9.1.0/_sources/slsreceiverheaderformat.rst.txt
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.. _sls receiver header format:
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SLS Receiver Header Format
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====================================================
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It is 112 bytes and consists of:
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* 48 bytes of the SLS Detector Header
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* 64 bytes of packet mask
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.. code-block:: cpp
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typedef struct {
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uint64_t frameNumber;
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uint32_t expLength;
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uint32_t packetNumber;
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uint64_t detSpec1;
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uint64_t timestamp;
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uint16_t modId;
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uint16_t row;
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uint16_t column;
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uint16_t detSpec2;
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uint32_t detSpec3;
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uint16_t detSpec4;
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uint8_t detType;
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uint8_t version;
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} sls_detector_header;
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struct sls_receiver_header {
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sls_detector_header detHeader; /**< is the detector header */
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sls_bitset packetsMask; /**< is the packets caught bit mask */
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};
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| **sls_detector_header** (described in :ref:`the current detector header <detector udp header>`)
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| The **packetNumber** from detector UDP header is modified in **sls_receiver_header** to number of packets caught by receiver for that frame and the bit mask for each packet caught is the **packetsMask**. The packetsMask is a total of 512 bits due to the largest number of packets per frame among our detectors.
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| For eg. Jungfrau has 128 packets per frame. If **packetNumeber** is 128, then this frame is complete. If it is 127 or less, it is a partial frame due to missing packets. If one would still like to use it, the **packetsMask** will specify which packet has been received or is missing.
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