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<div class="sect1">
<h2 id="ads_automation_device_specification">ADS (Automation Device Specification)</h2>
<div class="sectionbody">
<div class="imageblock">
<div class="content">
<img src="../../images/users/protocols/ads_banner.png" alt="banner" width="512" height="167"/>
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</div>
<div class="paragraph">
<p>The ADS (automation device specification) describes a device-independent and fieldbus independent interface for communication between Beckhoff automation devices running TwinCAT and other devices implementing this interface. <a href="https://www.home-assistant.io/integrations/ads/" class="bare">https://www.home-assistant.io/integrations/ads/</a> Source (accessed 7 August 2022)</p>
</div>
<div class="paragraph">
<p>ADS device concept: <a href="https://infosys.beckhoff.com/english.php?content=../content/1033/ams_nat/4275563275.html&amp;id=" class="bare">https://infosys.beckhoff.com/english.php?content=../content/1033/ams_nat/4275563275.html&amp;id=</a> Source (accessed 7 August 2022)</p>
</div>
<div class="paragraph">
<p>Specifcation for ADS devices: <a href="https://infosys.beckhoff.com/english.php?content=../content/1033/ams_nat/4275563275.html&amp;id=" class="bare">https://infosys.beckhoff.com/english.php?content=../content/1033/ams_nat/4275563275.html&amp;id=</a> Source (accessed 7 August 2022)</p>
</div>
<div class="sect2">
<h3 id="structure_amstcp_packet">Structure AMS/TCP Packet</h3>
<div class="paragraph">
<p>ADS (Automation Device Specification) is the TwinCAT communication protocol that specifies the interaction between two ADS devices. For example, it defines what operations can be executed on another ADS device, what parameters are necessary for that and what return value is sent after execution.</p>
</div>
<div class="paragraph">
<p>AMS (Automation Message Specification) specifies the exchange of the ADS data. A major component of the communication protocol is the AmsNetId. This is specified in the AMS/ADS package for the source and target device. An ADS device can be explicitly addressed using the AmsNetId.
Source <a href="https://infosys.beckhoff.com/english.php?content=../content/1033/ams_nat/4275563275.html&amp;id=" class="bare">https://infosys.beckhoff.com/english.php?content=../content/1033/ams_nat/4275563275.html&amp;id=</a> (accessed 7 August 2022)</p>
</div>
</div>
<div class="sect2">
<h3 id="connection_string_options">Connection String Options</h3>
<table class="tableblock frame-all grid-all stretch">
<colgroup>
<col style="width: 22.2222%;"/>
<col style="width: 22.2222%;"/>
<col style="width: 55.5556%;"/>
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">Name</th>
<th class="tableblock halign-left valign-top">Value</th>
<th class="tableblock halign-left valign-top">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Code</p></td>
<td class="tableblock halign-left valign-top" colspan="2"><div class="content"><div class="paragraph">
<p><code>ADS</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Name</p></td>
<td class="tableblock halign-left valign-top" colspan="2"><div class="content"><div class="paragraph">
<p>ADS Protocol</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Maven Dependency</p></td>
<td class="tableblock halign-left valign-top" colspan="2"><div class="content"><div class="listingblock">
<div class="content">
<pre>&lt;dependency&gt;
&lt;groupId&gt;org.apache.plc4x&lt;/groupId&gt;
&lt;artifactId&gt;plc4j-driver-ads&lt;/artifactId&gt;
&lt;version&gt;{current-last-released-version}&lt;/version&gt;
&lt;/dependency&gt;</pre>
</div>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Default Transport:</p></td>
<td class="tableblock halign-left valign-top" colspan="2"><div class="content"><div class="paragraph">
<p> <code>tcp</code></p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top" colspan="3"><p class="tableblock">Supported Operations</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p><code>read</code></p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top" colspan="3"><p class="tableblock">Options</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">AmsNetId</p></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>getTargetAmsNetId()</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>setTargetAmsNetId(AmsNetId targetAmsNetId)</p>
</div></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">AmsNetIdConverter</p></td>
<td class="tableblock halign-left valign-top"><div class="content"></div></td>
<td class="tableblock halign-left valign-top"><div class="content"></div></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">targetAmsPort</p></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>getDefaultPort(48898)</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Defaults to 48898</p>
</div></div></td>
</tr>
</tbody>
</table>
<table class="tableblock frame-all grid-all stretch">
<colgroup>
<col style="width: 33.3333%;"/>
<col style="width: 33.3333%;"/>
<col style="width: 33.3334%;"/>
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">Data array</th>
<th class="tableblock halign-left valign-top">Size</th>
<th class="tableblock halign-left valign-top">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">AMS/TCP Header</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">6 bytes</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">contains the length of the data packet.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">AMS Header</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">32 bytes</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">The AMS/TCP-Header contains the addresses of the transmitter and receiver. In addition the AMS error code , the ADS command Id and some other information.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">ADS Data</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">n bytes</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">The ADS data range contains the parameter of the single ADS commands. The structure of the data array depends on the ADS command. Some ADS commands require no additional data.</p></td>
</tr>
</tbody>
</table>
</div>
<div class="sect2">
<h3 id="more_details_on">More details on</h3>
<div class="paragraph">
<p>For details about the protocol look here: <a href="http://www.beckhoff.com/" class="bare">http://www.beckhoff.com/</a>
&amp; (German Handbook: <a href="https://download.beckhoff.com/download/Document/automation/twincat3/TwinCAT_3_ADS_INTRO_DE.pdf" class="bare">https://download.beckhoff.com/download/Document/automation/twincat3/TwinCAT_3_ADS_INTRO_DE.pdf</a>)</p>
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