Simplified Tango Device Server Model¶
Intended audience: beginners, developers, administrators, users
This document is directed to beginner developer.
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|
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.
|DeviceProperty||Device specific configuration|
|Attribute||See Glossary, Attribute.|
|Pipe||See Glossary, Pipe.|
|Event||Refer to Events.|
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|
|Device||domain/family/member||To identify the device|
|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|