- Updated docs

SKIPPED:
	psi/utils/SerPortServer.c

doc/user/topscan.htm

@@ -93,6 +93,37 @@ can be given in order to allow for several scan variables.
 the mode currently configured active in the scan object is used.
 </UL>
 </p>
+<h2>Fastscan</h2>
+<p>
+At some instruments there is a fastscan facility. This scan starts a
+motor and the counter. As often as possible or configured, the scan
+module will calculate the difference to the previous count, normalize
+it to the monitor difference and print it. This is usually faster then
+doing a step scan. There are limitations, though:
+<ul>
+<li>Fastscans are restricted to one motor. There is no way that a
+coordinated movement of several motors can be enforced by fastscan 
+without mechanical coupling.
+<li>Due to the volatile nature of the beam at SINQ, this type of scans
+come into problems when the beam is off. A warning is printed, but...
+<li>If the motor is driving to fast, there might not be enough
+neutrons around even in the peak to be registered.
+</ul>
+Basically, <b>if you see a feauture in fastscan, it is there, if not,
+that does not mean anything!</b>. Fastscan comes into its own for
+alignment scans or when searching peaks. The syntax is:
+<dl>
+<dt>fastscan motor start stop speed
+<dd>Runs a fastscan on motor between start and stop. Speed is the
+speed with which the motor is run. The motors speed is reset to the
+original value when fastscan finishes. 
+<dt>diffscan skip val
+<dd>If fastscan produces to much output on to short intervalls,
+increasing the skip parameter allows to control that. Skip is the
+number of SICS cyles to skip between measurements. Thus this value is
+highly dependent on the overall performance of SICS.   
+</dl>
+</p>
 <h2>Peak And Center</h2>
 <p>
 These two commands are related to the scan command insofar as they act upon
@@ -107,5 +138,17 @@ the position, FWHM and maximum value of the peak in the last scan. The
  The two points are interpolated from the data and the peak position 
  calculated as the middle point between the two halfheight points. 
 </p>
+<h2>PSD scans</h2>
+<p>
+Some instrument wish to perform scans with position sensitive
+detectors. In such cases the scan mode can be switched between PSD and
+normal mode. This is done through the commands:
+<dl>
+<dt>scan2d
+<dd>Switches PSAD detetcor scanning on.
+<dt>scan1d
+<dd>Switches back to normal scan mode on a single counter.
+</dl>
+</p>
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