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Marty Kraimer
2011-12-20 08:24:46 -05:00
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<!-- Maturity: Working Draft or Request for Comments, or Recommendation, and date. -->
<h2 class="nocount" id="L50">EPICS v4 Working Group, Working Draft,
19-Dec-2011</h2>
20-Dec-2011</h2>
<dl>
<dt>This version:</dt>
<dd><a
href="http://epics-pvdata.sourceforge.net/pvAccessCPP_20111219.html">pvAccessCPP_20111219.html</a></dd>
href="http://epics-pvdata.sourceforge.net/pvAccessCPP_20111220.html">pvAccessCPP_20111220.html</a></dd>
<dt>Latest version:</dt>
<dd><a
href="http://epics-pvdata.sourceforge.net/pvAccessCPP.html">pvAccessCPP.html</a></dd>
href="http://epics-pvdata.sourceforge.net/pvAccessCPP_20111220.html">pvAccessCPP_20111220.html</a></dd>
<dt>Editors:</dt>
<dd>Marty Kraimer, BNL</dd>
</dl>
@ -40,29 +40,47 @@
</div>
<h2 class="nocount" id="L72">Abstract</h2>
<p>pvIOCAccess is the Java implementation of pvAccess, which is one of a related
set of products:</p>
<dl>
<dt><a
href="http://epics-pvdata.hg.sourceforge.net/hgweb/epics-pvdata/pvDataCPP/raw-file/tip/documentation/pvDataCPP.html">pvData</a></dt>
<dd>pvData (Process Variable Daata) defines and implements an efficent way
to store, access, and transmit memory resident structured data</dd>
<dt><a
href="http://epics-pvdata.hg.sourceforge.net/hgweb/epics-pvdata/pvAccessCPP/raw-file/tip/documentation/pvAccessCPP.html">pvAccess</a></dt>
<dd>pvAccess is network support for transmitting pvData.</dd>
<dt><a
href="http://epics-pvdata.hg.sourceforge.net/hgweb/epics-pvdata/pvIOCCPP/raw-file/tip/documentation/pvIOCCPP.html">pvIOC</a></dt>
<dd>A pvIOC is a network accessable smart real time database. The database
consists of memory resident records. Each record has a name that is
uniquie within the local area network and contains a top level pvData
structure. Each field of a record can optionally have support code
attached to it. The support is called when a request is made to process
the record. The support code is what makes the record "smart". A pvAccess
server is provided so that the records can be accesed via the network.
</dd>
</dl>
<p>pvAccess is an implementation of Channel Access, i. e. network support for
transmitting Process Variable Data, that fully supports pvData.</p>
<p>Each of the products has a Java and a C++ implementation.</p>
<p>pvData (Process Variable Data) defines and implements an efficent way to
store, access, and transmit memory resident structured data.</p>
<p>This document will describe the CPP implementation of EPICS v4 pvAccess.</p>
<p>For more information about the EPICS, please refer to the home page of the
<a href="http://www.aps.anl.gov/epics/">Experimental Physics and Industrial
<p>The products are all part of the <a
href="http://epics-pvdata.sourceforge.net/">V4</a> implementation of <a
href="http://www.aps.anl.gov/epics/">Experimental Physics and Industrial
Control System.</a></p>
<h2 class="nocount" id="L80">Status of this Document</h2>
<p>This is the 19-Dec-2011 version of the C++ implementation of pvAccess. The
<p>This is the 20-Dec-2011 version of the C++ implementation of pvAccess. The
code is a complete implementation of pvAccess as currently defined. This
overview is NOT written.</p>
CONTENTS
<div class="toc">
<ul>
<li><a href="#L50">EPICS v4 Working Group, Working Draft, 19-Dec-2011</a></li>
<li><a href="#L50">EPICS v4 Working Group, Working Draft, 20-Dec-2011</a></li>
<li><a href="#L72">Abstract</a></li>
<li><a href="#L80">Status of this Document</a></li>
<li><a href="#L88">Introduction</a></li>