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194 lines
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<TITLE>In which data format are written the data?</TITLE>
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<B> Next:</B> <A NAME="tex2html315"
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HREF="node14.html">General questions about detectors</A>
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HREF="node12.html">How can the detector</A>
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<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>
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<UL>
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<LI><A NAME="tex2html316"
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HREF="node13.html#SECTION002111000000000000000">GOTTHARD</A>
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<LI><A NAME="tex2html317"
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HREF="node13.html#SECTION002112000000000000000">EIGER</A>
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<LI><A NAME="tex2html318"
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HREF="node13.html#SECTION002113000000000000000">JUNGFRAU</A>
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<H1><A NAME="SECTION002110000000000000000"></A> <A NAME="sec:dataFormat"></A>
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<BR>
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In which data format are written the data?
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</H1>
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<P>
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For MYTHEN the data are writen in ASCII fomat, one file per frame, in columns, either channel number - counts for the <I>.raw</I> files or angle (or channel number)-counts-error for the <I>.dat</I> files.
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<P>
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For the other detectors the files are written in binary format, and must be decoded depending on the detector.
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<P>
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<H2><A NAME="SECTION002111000000000000000">
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GOTTHARD</A>
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</H2>
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Each file contains 100 frames.
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<DL>
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<DT><STRONG>Normal mode</STRONG></DT>
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<DD>Each frame is split into 2 packets of 1286 bytes each, where actual data is 1280 bytes each. Both the packets (incl header and footer) are written one after the other into the file.
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<P>
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Representation of each packet:
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<UL>
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<LI>The first 4 bytes represents a number from which, the frame number and packet number can be derived.
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If the number was 108601, increment it by 1 to get 108602.
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<BR>
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Then this <!-- MATH
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$(108602\&0xFFFFFFFE)>>1 = 54301$
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-->
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<IMG
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WIDTH="296" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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SRC="img12.png"
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ALT="$ (108602\&0xFFFFFFFE)>>1 = 54301$">
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is the frame number
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and <!-- MATH
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$(108602\&0x1) =0$
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-->
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<IMG
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WIDTH="131" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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SRC="img13.png"
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ALT="$ (108602\&0x1) =0$">
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is the packet number.
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<BR>
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0 is the packet on the left and 1 is the packet on the right.
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<BR>
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On a side note, when you use the data call back, we also give you the derived frame number as an argument.
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<P>
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</LI>
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<LI>Data of 1280 bytes. 16 bits per pixel.
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<P>
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</LI>
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<LI>2 bytes of insignificant footer.
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</LI>
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</UL>
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<P>
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</DD>
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<DT><STRONG>Short Frame Mode</STRONG></DT>
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<DD>One Frame has only one packet of 518 bytes, where actual data is 512 bytes.
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<UL>
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<LI>first 4 bytes is the frame number. There is no packet number or increment required herecompared to the normal mode.
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</LI>
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<LI>Data of 512 bytes.
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</LI>
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<LI>2 bytes of insignificant footer.
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</LI>
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</UL>
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<P>
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</DD>
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</DL>
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<H2><A NAME="SECTION002112000000000000000">
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EIGER</A>
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<H2><A NAME="SECTION002113000000000000000">
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JUNGFRAU</A>
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HREF="node2.html">SLS Detectors Software</A>
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<B> Previous:</B> <A NAME="tex2html307"
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HREF="node12.html">How can the detector</A>
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<ADDRESS>
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Thattil Dhanya
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2017-09-27
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</ADDRESS>
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