.FLOW  <p>
DESCRIPTION<p>
<tt><b>.FLOW </b></tt>  is a high level engineering diagnostic routine which
interrogates the current CCD controller to find out the state of the Nitrogen
Flushing system.  The command displays the current flow rate and interlock
threshold parameters, whether the interlock is enabled and if it is operating.
There is a flow sensor on the exhaust port of the Peltier CCD enclosure, and if
there is not enough flow, the CCD is not allowed to be cooled due to the danger
of ice crystals forming on the CCD face and damaging it.  The interlock can be
overidden from the VME system.<p>
The Autoguider will, in later versions, monitor the CCD temperature and the
Nitrogen Flow rate occasionally in a background task, and report problems over
the Utility network.<p>
CALLING PARAMETERS<p>
None.<p>
INITIAL/DEFAULT VALUE<p>
None<p>
RETURN VALUES<p>
<b>None</b><p>
<b></b>RESTRICTIONS<p>
	With the current CCD controller software, the flow rate board is not
fitted, and this function is disabled.  The CCD software version supported is
controlled by the constant CCD-V2 in the DUTCH vocabulary..<p>
	The background flow monitoring task is not implemented in this
release.<p>
EXAMPLE  <p>
<tt>AUTOGUIDER&gt; .FLOW flow rate threshold = 5</tt><p>
<tt>current flow rate   = 7084</tt><p>
<tt>flow rate ABOVE threshold</tt><p>
<tt>Interlock disabled</tt><p>
<tt>CCD temp: -330</tt><p>
<tt></tt><p>
<tt>AUTOGUIDER&gt;</tt>