Simplified Tango Device Server Model¶

Intended audience: beginners, developers, administrators, users

This document is directed to beginner developer.

Primary Presentation¶

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	See Glossary, attribute.
Pipe	See Glossary, 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

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