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\begin{document}
\begin{center}
\begin{huge}
Saving EL734 Motor Parameters on Unix
\end{huge}
16-October-1998\\
\end{center}
EL734 motor controllers occasionally loose their built in parameters.
Therefore it is necessary to save their parameters and to have a way to load
them to the motor controller when need arises. This can be done with 
David Maden's EL734\_test
program. This program has now been made available on DigitalUnix. For each
SICS instrument motor parameters are stored at two independent locations:
\begin{itemize}
\item In the motor directory of the instrument account. For example:
/home/DMC/motor
\item On lnsa10 in the lnslib account in a motor/instrument directory. For
example: /data/lnslib/motor/dmc   
\end{itemize}
In each of these directories there is an instrument specific shell script
which does the job. It has a name such as instrumentmotor, for example
dmcmotor . This shell script expects one argument which must be one of the
keywords load or save. With the option save specified motor parameters are
read from the controller and stored into files. With the option load the
stored motor parameters are loaded into the motor controller. Thus the
procedure for saving and restoring motor parameters becomes:
\begin{enumerate}
\item change to the directory with the motor parameters
(/home/INSTRUMENT/motor or /data/lnslib/motor/instrument).
\item type: instrumentmotor save  for saving motor parameters to disk.
\item type instrumentmotor load   for loading motor parameters to the
controller. 
\end{enumerate}

\begin{Large}
It is the instrument scientists responsability to save motor parameters to
disk after changes to both locations.
\end{Large} 

In order to make this more interesting, files at lnsa10 are write protected.
In order to overwrite those you need to use the unix command chmod. 

Saving motor parameters generates files with names like motNUM1@NUM2.par
with NUM1, NUM2 being numbers. This means: motor number NUM1 at EL734 motor
controller at Macintosh channel NUM2. These files can be edited when you
know what you are doing. The command syntax is described in the El734 motor
controller manual.

   
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