Simplified Tango Device Server Model
Intended audience: beginners, developers, administrators, users
This document is directed to beginner developer.
Primary Presentation
Elements
Block |
Description |
---|---|
Device |
Abstract concept defined by the TANGO device server object model; it can be a piece of hardware (an interlock bit) a collection of hardware (a screen attached to a stepper motor) a logical device (a taper) or a combination of all these (an accelerator). |
TANGO Class |
From Object Oriented Programming concept, this is the main class that the developer has to implement |
DeviceServer |
The server (also referred as device server) is a process whose main task is to offer one or more services to one or more clients. To do this, the server has to spend most of its time in a wait loop waiting for clients to connect to it. The devices are hosted in the server process. A server is able to host several classes of devices. In short, it is a process that export devices available to accept requests). Please refer also to the Glossary, device server instance. |
DeviceProperty |
Device specific configuration |
Attribute |
|
Pipe |
|
Event |
Refer to Events. |
Command |
See Glossary. |
State |
The device state is a number which reflects the availability of the device. Refer to Events |
Status |
The state of the device as a formatted ascii string |
Attributes
Block |
Attribute |
Description |
---|---|---|
Device |
domain/family/member |
To identify the device |
Relations
Left Block |
Right Block |
Multiplicity |
Description |
---|---|---|---|
Device |
TANGO Class |
1 |
Every device belongs to a Tango class |
Attribute |
Event |
0..* |
An attribute can have more than one event associated |
Device |
DeviceProperty |
0..* |
A device can have more than one Device Property associated |
DeviceServer |
Device |
1..* |
Every Device server has many devices inside itself |
TANGO Class |
Attribute |
0..* |
A TANGO Class can have more than one Attribute associated |
TANGO Class |
Command |
0..* |
A TANGO Class can have more than one Command associated |
TANGO Class |
Pipe |
0..* |
A TANGO Class can have more than one Pipe associated |