Simplified Tango Device Server Model

Intended audience: beginners, developers, administrators, users

This document is directed to beginner developer.

Primary Presentation



Block Description

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.

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 See Glossary, Attribute.
Pipe See Glossary, Pipe.
Event Refer to Events.
Command See Glossary.

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


Block Attribute Description
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