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<HEAD>
<TITLE>In which data format are written the data?</TITLE>
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<B> Next:</B> <A NAME="tex2html315"
HREF="node14.html">General questions about detectors</A>
<B> Up:</B> <A NAME="tex2html311"
HREF="node2.html">SLS Detectors Software</A>
<B> Previous:</B> <A NAME="tex2html307"
HREF="node12.html">How can the detector</A>
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<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>
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<LI><A NAME="tex2html316"
HREF="node13.html#SECTION002111000000000000000">GOTTHARD</A>
<LI><A NAME="tex2html317"
HREF="node13.html#SECTION002112000000000000000">EIGER</A>
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<HR>
<H1><A NAME="SECTION002110000000000000000"></A> <A NAME="sec:dataFormat"></A>
<BR>
In which data format are written the data?
</H1>
<P>
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.
<P>
For the other detectors the files are written in binary format, and must be decoded depending on the detector.
<P>
<H2><A NAME="SECTION002111000000000000000">
GOTTHARD</A>
</H2>
Each file contains 100 frames.
<DL>
<DT><STRONG>Normal mode</STRONG></DT>
<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.
<P>
Representation of each packet:
<UL>
<LI>The first 4 bytes represents a number from which, the frame number and packet number can be derived.
If the number was 108601, increment it by 1 to get 108602.
<BR>
Then this <!-- MATH
$(108602\&0xFFFFFFFE)>>1 = 54301$
-->
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WIDTH="296" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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is the frame number
and <!-- MATH
$(108602\&0x1) =0$
-->
<IMG
WIDTH="131" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
SRC="img13.png"
ALT="$ (108602\&amp;0x1) =0$">
is the packet number.
<BR>
0 is the packet on the left and 1 is the packet on the right.
<BR>
On a side note, when you use the data call back, we also give you the derived frame number as an argument.
<P>
</LI>
<LI>Data of 1280 bytes. 16 bits per pixel.
<P>
</LI>
<LI>2 bytes of insignificant footer.
</LI>
</UL>
<P>
</DD>
<DT><STRONG>Short Frame Mode</STRONG></DT>
<DD>One Frame has only one packet of 518 bytes, where actual data is 512 bytes.
<UL>
<LI>first 4 bytes is the frame number. There is no packet number or increment required herecompared to the normal mode.
</LI>
<LI>Data of 512 bytes.
</LI>
<LI>2 bytes of insignificant footer.
</LI>
</UL>
<P>
</DD>
</DL>
<P>
<H2><A NAME="SECTION002112000000000000000">
EIGER</A>
</H2>
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<H2><A NAME="SECTION002113000000000000000">
JUNGFRAU</A>
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<BR>
<B> Next:</B> <A NAME="tex2html315"
HREF="node14.html">General questions about detectors</A>
<B> Up:</B> <A NAME="tex2html311"
HREF="node2.html">SLS Detectors Software</A>
<B> Previous:</B> <A NAME="tex2html307"
HREF="node12.html">How can the detector</A>
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<ADDRESS>
Thattil Dhanya
2018-02-09
</ADDRESS>
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