\subsubsection{Bruker Magnet Controller B-EC-1}
SANS is using a Bruker magnet controller. This controller is integrated
into SICS as a derivate of an environment controller.  The Bruker controller 
can be operated in two modes: in the first the  current is controlled,
in the  second the current
is controlled by an external hall sensor giving the magnetic field. Whatever
is the controlling sensor, the magnetic field and the current need to be
read. Furthermore this device supports switching the polarity. All this is
achieved with a special driver and an additional wrapper function for
handling extra commands. All this is implemented in the file bruker.h
and bruker.c. The functions defined are:

\begin{verbatim}
    pEVDriver CreateBrukerDriver(int argc, char *argv[]);
    
    int BrukerReadField(pEVControl self, float *fField);
    int BrukerReadCurrent(pEVControl self, float *fCurrent);
    
    int BrukerAction(SConnection *pCon, SicsInterp *pSics, void *pData,
                     int argc, char *argv[]);
  
\end{verbatim}

\begin{description}
\item[CreateBrukerDriver] creates a driver for the bruker magnet
controller.
\item[BrukerReadField] reads the current magnetic field.
\item[BrukerReadCurrent] reads the current current in Ampere.
\item[BrukerAction] a special SICS interpreter wrapper function  for
the Bruker Magnet. This function handles the few special Bruker
commands and passes everything else to the standard environment
controller handler function. 
\end{description}