In the case of a problem occurring at initialization, it is recommended to set the device state to FAULT. The developer must define the device behaviour regarding its internal state via POGO. The order of reloading is deterministic but complex order of ClassFactory then device definition in database then attribute definition in POGO. TANGO implements a mechanism called polling which alleviates the problem of equipment response time which is usually the weak point in terms of performance. Data types choice 3. The property naming recommendations are: The first one presents the Tango concepts The second one focuses on DeviceServers design consideration The last one insists on implementation good practices.
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A Device has an interface composed of commands and attributes, which provides the service of the device. DevLong signed integer 32 bits. The static metadata includes properties macfo as the name, the type, the dimension, if the attribute is writable or not. This state is reserved to the starting phase of the device server.
The client load is therefore competing 3.5.3.1 polling activity. There is, however, two exceptions to this rule: Taking an axis controller as example, the controller must be configured for the motor mechanic according to the characteristics of the actuator and the movements to achieve. These three concepts are closely related, but they express very important concepts of Tango. The .35.3.1 of rigorous error handling 3. It is the case when there is a communication problem to the hardware network cut, broken cable etc… It could also represent an incoherent situation.
The client has the choice to retrieve the server answer by checking if the reply is arrived by calling an API specific call or by requesting that a call-back method is executed when the client receives the server answer. Similarly, some mechanisms to store the experimental data such as those implemented by the DataRecorder of SOLEIL are essentially based on the concept of attribute. This class owns a thread associated with a FIFO message list.
Several technical solutions are available to the device developer to ensure service availability: In the case where technical constraints prohibit the deployment of multiple instances of a TANGO device within the same device server, the developer has to ensure that only one instance can be created.
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Properties reading during device initialization 3. Refer to chapter 1. These are properties to configure the device itself and its attributes.
When the design of the Tango class requires threading: The error handling is described more in details in chapter 1. Several technical solutions are available to the device developer to ensure service availability:.
It is important to distinguish the function of each, and use them wisely. Attributes properties related to Events configuration 3. A DevFailed exception consists mqcro these fields:. If no value could be found, the device initialisation will stop with an exception on the missing property value.
The following people have contributed to this document: Purpose of an attribute 3.
Introduction — Tango Controls documentation
Created using Sphinx 1. Any deviation from these rules must be justified in the description of the attribute or command particular case. For example, in some cases, when a device used several elementary devices, its state is a combination of the elementary devices states.
The device has a ezpress failure that prevents it to work. The device command and attributes names must be explicit and should enable to quickly understand the nature of the attribute or the command.
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READ, The attribute can only be read e. The calls initiated by the client may be macr by 2 mechanisms:. It means that the software is not fully operational and that the user must wait. This paragraph details the parameters listed here. They are used by GUI viewers to configure themselves.
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