Wind River Glossary


Wind River Technical Glossary

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A

application layer

 

In the OSI network layer model, the application layer is the topmost layer--furthest away from the physical connection and closest to the data's origination or destination.

area

 

An area is a grouping of plant equipment configured by the user, typically according to areas of operator responsibility. The definition of the area configuration is server specific. Implementation of the area concept is optional. Wind River OPC server is going to implement area browsing. But most of the details of what an area means is left to the customer to decide. If areas are available, the client may create anOPCEventAreaBrowser object to browse the process area organization. The client can filter event subscriptions by specifying the process areas to limit the event notifications sent by the server.

ARP

 

Address Resolution Protocol

assembler

 

A tool that takes assembly language input and converts it into object file formats. In contrast to the C compiler it does not translate the programming language, because there is a one on one mapping from assembler mnemonics to machine operation codes Depending on optimization constraints the assembler may reorder and optimize the original assembler code for maximum utilization of the chosen target.

asynchronous

 

When a process sends a message and then continues processing without waiting for a reply, or calls a function and continues without waiting for the function to complete its processing, these are said to beasynchronous messages or asynchronous function calls.

attach

 

To attach the target application and the TCD so that the target application can receive and respond to requests from the host through that TCD, the application in the initialization code uses a target layer routine.

attributes

 

Each of the event objects may have custom attributes, enabling the server to provide additional information to the client with each event notification or whenever the client requests additional condition state data. The client can query the server for the available event attributes per category ID. The client can then select which attributes are sent with the event notification. While Wind River OPC does most of the work, the user must define which types of attributes are used and then include the attribute data in each event that is reported to the Event Manager.

audio device

 

An audio device is a device that sources or sinks sampled analog data.

Authentication

 

The process to establish that an entity is trusted by another entity. Both IEEE 802.1X and IEEE 802.11 define their own authentication processes.

authentication phase

 

If the peers of a PPP connection negotiate an authentication phase for the connection, the peers will perform authentication with an authentication protocol.


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