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<HTML>
<HEAD>
<TITLE>Chopper Control</TITLE>
</HEAD>
<BODY>
<H1>Chopper Control</H1>
<P>
POLDI is equipped with a Dornier Disk Chopper. The SICS program handling
RS-232 requests at the chopper control computer
is rather slow. This would slow the SICS server to unacceptable
levels, if any request would be handled through the RS-232 interface. In order
to cope with the problem, the SICS server buffers chopper
information. This information is updated any minute if not set otherwise.
</p>
<p>
The chopper system control is divided into several distinct objects: There
is the actual chopper controller which mainly serves for answering
status requests. One virtual motor (chopperspeed) is available which
represent the modifiable parameter of the disk chopper. The parameter can
be driven through the normal <a
href="drive.htm">drive</a> command. The commands understood by the
chopper controller object are:
<dl>
<DT>choco list
<DD>prints a listing of all known chopper parameters. Parameters phase and ratio are not used.
<DT>choco <i>name</i>
<DD>print only the value of parameter name. Possible values for name
can be extracted from the list printed with choco list (example choco <i>speed</i>).
</dl>
The following virtual motor variable exists.
<dL>
<DT>chopperspeed
<DD>disk chopper speed
</DL>
The variable <i>chopperspeed</i> kindly prints its current value when given as a command. Modifying the value happens through the normal drive
command. For instance the command:
<pre>
drive chopperspeed 10000
</pre>
will drive the disk chopper to 10000 RPM eventually and if no problem occurs.
Please check your input carefully for all chopper commands.
Dornier has provided no way to stop an erraneous command in its software. So, if you intend to run the chopper to 1000 RPM and mistyped it as 10000 then
you'll wait for 20 minutes until the chopper is at speed!
</p>
</BODY>
</HTML>