Difference between revisions of "Glossary"

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[[#A|A]] [[#B|B]] [[#C|C]] [[#D|D]] [[#E|E]] [[#F|F]] ... [[#H|H]] .. [[#O|O]] .. [[#R|R]] [[#S|S]] [[#T|T]] [[#U|U]] ..
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= Alphabetical Index =
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; [[#A|A]]
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; [[#B|B]]
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= Glossary =
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;Web Server
 
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: The MIDAS Web Server is the application [[mhttpd]]. It is accessible from a browser and is used to control and monitor a MIDAS experiment.
 
: The MIDAS Web Server is the application [[mhttpd]]. It is accessible from a browser and is used to control and monitor a MIDAS experiment.
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[[Category:Contents]]

Revision as of 14:29, 6 January 2016


Alphabetical Index

A
B
C
D
E
F
G
H
I - N
O
P
Q
R
S
T
U
V
W
X Y Z

Glossary

A

Application
MIDAS Applications are programs provided by the MIDAS system to perform various functions e.g. data logging, web server etc. They run as MIDAS #Clients.

B

Buffer
MIDAS maintains buffers (i.e. #Shared Memory) for ODB, System Messages, Data, Alarms and History system information. These buffers are managed by the Buffer Manager.

C

Client
A MIDAS Client is an #Application provided by the MIDAS system or (partially) written by the user (e.g. a #Frontend) that links with the MIDAS libraries and runs under the MIDAS system to allow the user to run a MIDAS #Experiment. MIDAS clients can be Local or Remote.
Local
A MIDAS client than runs on the Experiment Host.
Remote
A MIDAS client than runs on a Remote Host.

D

Data Bank
data in an event in a particular format
Device
a Hardware module (e.g. a scaler) to be accessed by software called a device driver.
Driver
(also device driver). Software that allows access to a particular hardware module.

E

Environment Variables
Certain Environment Variables are used by MIDAS. Only MIDASSYS is required.
Equipment
usually Software equipment
Hardware
Hardware Devices (e.g. a set of scalers) grouped together for convenience of data readout by a Software Equipment.
Software
usually called "Equipment". A single or a collection of sub-tasks meant to collect and regroup logical or physical data (read from a Hardware Equipment) under a single and uniquely identified event. Software Equipments are usually found in Frontends, and are reflected in the /Equipment ODB tree.
Event
a collection of data sent into the data stream by an Equipment, usually in the form of data banks.
Experiment
a MIDAS experiment defined on the Experiment Host. Optionally defined in the exptab file.
Host
see #Host

F

Frontend
A MIDAS application built by the user which usually has access to hardware equipment in use by the experiment. Includes Frontend Code linked with a fixed framework mfe.c to form a Frontend.
Code
The frontend code is the user-written part of the frontend application (e.g. frontend.c) describing sequence of actions to acquire the hardware data. See Frontend above.

H

History
The MIDAS History System records useful information in parallel with the data logging. This can be displayed graphically.
Host
Computer running MIDAS clients, usually #Experiment Host.
Experiment
the experiment host is the host computer on which the MIDAS experiment #Shared Memory resides.
Remote
a remote host is a host computer on which (remote) MIDAS client(s) run which connect to the MIDAS experiment on the Experiment Host. See Quickstart Linux to set up a remote host.

O

ODB
The Online Data Base (ODB) contains all the information needed for an experiment. It can be accessed and/or edited using the ODB Page of the #Web Server or odbedit application.
Directory
The ODB is structured as a "directory". ODB Directory is used as alternative name for an ODB Tree.
Key
Data in the ODB are contained in Key/Data pairs in an ODB Tree or subtree. ODB Keys can be of various Types. In the Path /Logger/write data, the key is write data.
Type
ODB Key Types can be one of BYTE,CHAR,WORD,SHORT,DWORD,INT,BOOL,FLOAT,DOUBLE,STRING
Data
Data is contained in Key/Data pairs in the ODB. Use the #Web Server or odbedit application to view the Key/Data pairs.
Path
"address" used to access an ODB Key using the directory structure of the ODB, e.g. /Logger/write data. Upper/Lower Case is ignored.
Subdirectory
Alternative name to ODB Subtree used by some authors
Subtree
An ODB subtree starts at a lower level than an ODB Tree, e.g. /Experiment/Security subtree.
Tree
data in the ODB are structured in a tree form with each "directory" dealing with a specific section of the acquisition. An ODB Tree starts at the top level, e.g. /Equipment ODB tree.

R

Remote host
see#Host
Run
A run starts when the MIDAS system receives a Start Transition , and continues until it receives a Stop transition
State
MIDAS defines three run states: Stopped, Paused and Running. See Run States and Transitions.

S

Server
MIDAS
A remote procedure call (RPC) server mserver available for remote access to a MIDAS experiment.
Web
See #Web Server
Shared Memory
The MIDAS shared memory regions in RAM are called buffers, and managed by the MIDAS Buffer Manager. MIDAS uses shared memory for the ODB, System Messages, Data buffer, Alarms and History systems. The MIDAS shared memory saved files (.*.SHM) for an experiment reside on the Experiment host at the path given by the Environment Variable MIDASSYS.
State
See #Run State

T

Task
a MIDAS client application. Task and Utility are used in this document as alternatives to Application by different authors.
Transition
A transition occurs when a MIDAS experiment changes from one run state to another. See Run States and Transitions.

U

Utility
a MIDAS client application. Utility and Task are used in this document as alternatives to Application by different authors.

W

Web Server
The MIDAS Web Server is the application mhttpd. It is accessible from a browser and is used to control and monitor a MIDAS experiment.