===== OMG: OPC-UA/DDS Gateway (DDS-OPCUA) =====
[[dido:public:ra:xapend:xapend.b_stds:tech:omg:start| return to the OMG Standards ]]

<table>
<caption>Data sheet for OPC-UA/DDS Gateway (DDS-OPCUA)</caption>
| Title                      | OPC-UA/DDS Gateway  |
| Acronym                    | DDS-OPCUA |
| Version                    | 1.0  |
| OMG Document Number        | formal/20-01-01 |
| Release Date               | February 2020  |
| About Specification        | [[https://www.omg.org/spec/DDS-OPCUA/]] |
| Document                   | [[https://www.omg.org/spec/DDS-OPCUA/1.0/PDF]]|
</table>
  : **Note**: The following is an excerpt from the actual document. It is provided here as a convenience and is not authoritative. Refer to the original document as the authoritative reference.

==== Scope ====
  : //[[dido:public:ra:xapend:xapend.a_glossary:d:dds]] is a family of standards from the [[dido:public:ra:xapend:xapend.a_glossary:o:omg]] that provide
connectivity, interoperability, and [[dido:public:ra:xapend:xapend.a_glossary:p:portability|portability]] for Industrial Internet, cyber-physical, and mission-critical [[dido:public:ra:xapend:xapend.a_glossary:a:application|applications]].//

  : //The DDS connectivity standards cover [[dido:public:ra:xapend:xapend.a_glossary:p:publish-subscribe|Publish-Subscribe]] (DDS), Service Invocation (DDS-RPC), [[dido:public:ra:xapend:xapend.a_glossary:i:interoperability|Interoperability]]
(DDS-RTPS), Information Modeling (DDS-XTYPES), Security (DDS-SECURITY), as well as programing APIs for C,
C++, Java and other languages.//

  : //The [[dido:public:ra:xapend:xapend.a_glossary:o:opc-ua]] is an information exchange standard for Industrial Automation and related
systems created by the OPC Foundation. The OPC UA standard provides an Addressing and Information Model for
Data Access, Alarms, and Service invocation layered over multiple transport-level protocols such as Binary TCP and
Web-Services.//

  : //DDS and OPC UA exhibit significant deployment similarities://
    * //Both enable independently developed applications to interoperate even when those applications come from different vendors, use different programming languages, or run on different platforms and operating systems.//
    * //Both have significant traction within Industrial Automation systems.//
    * //Both define standard protocols built on top of the TCP/ UDP/IP Internet stacks.
The two technologies may coexist within the same application domains; however, while there are solutions that [[dido:public:ra:xapend:xapend.a_glossary:b:bridge|bridge]]
between DDS and OPC UA, these are based on custom mappings and cannot be relied to work across vendors and
products.//

  ://This specification overcomes this situation by defining a standard, vendor-independent, configurable [[dido:public:ra:xapend:xapend.a_glossary:g:gateway|gateway]] that enables interoperability and information exchange between systems that use DDS and systems that use OPC UA.//


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