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* [[/Logger ODB tree]] The Midas [[mlogger|data logger]] serves multiple purposes related to data logging.

* [[Keys in the ODB /Logger tree| /Logger tree]] * [[/Logger ODB tree #Example | example /Logger tree]]

A '''subrun''' scheme is available in the MIDAS event logger utility ([[mlogger]]) ...ile into several individual data files. This feature might be helpful if a data file from a single run gets too large (>4 GB for example) and if shorter ru

* [[Keys in the ODB /Logger tree| /Logger tree]] * [[/Logger ODB tree #Example | example /Logger tree]]

* [[keys in the ODB /Logger tree | ODB /Logger tree ]] * [[keys in the ODB /Logger/Runlog/SQL subtree |ODB /Logger/Runlog/SQL subtree]]

== Data Formats in MIDAS == ...ucture|"MIDAS"]] and [[Event Structure#FIXED Format Event|"FIXED"]]. See [[MIDAS Event Construction]] for details.

* [[/Logger ODB tree| /Logger tree]] * [[Keys in the ODB /Logger tree| /Logger keys]]

* [[keys in the ODB /Logger tree | ODB /Logger tree ]] * [[keys in the ODB /Logger/Runlog/SQL subtree |ODB /Logger/Runlog/SQL subtree]]

* [[keys in the ODB /Logger tree | ODB /Logger tree ]] * [[keys in the ODB /Logger/Runlog/SQL subtree |ODB /Logger/Runlog/SQL subtree]]

This information has been added to documentation under [[History System]], [[/Logger ODB tree]], [[/History ODB tree]] ...e data into the history, mhttpd, mhist & co can use this interface to read data from the history. The interface is defined in history.h

* [[Keys in the ODB /Logger tree| keys in /Logger tree]] * [[Keys in the ODB /Logger/Channels subtree |keys in /Logger/Channels subtree]]

...nto different saved files based on the Event ID or the Trigger Mask (see [[MIDAS Event Structure]]). ...s way, it is necessary to set up the required number of [[Keys in the ODB /Logger/Channels tree #Multiple Logging Channels | logging Channels]]. By default,

...is#Analyzer | Analyzer]]''' → ''Data consumer for Online/Offline data analyzer'' * '''[[Data Logger]]''' → ''Data Consumer for data recording''

;[[Data Formats#byte-ordering | Byte-ordering]] : [[Current supported Hardware |supported in MIDAS]]

** What is Midas: ... DAQ for intermediate phys. expt. ** What Midas can do for you: ... collect data from different source (HW, Network)

.... For example, the Data Logger [[mlogger]] will create the {{Odbpath|path=/Logger}} ODB tree, and a [[Frontend Application|Frontend]] will create the {{Odb * [[/Analyzer ODB tree]] → ''Reserved for the data analyzer''

* [[/Logger ODB tree| /Logger tree]] * [[Keys in the ODB /Logger/Channels subtree| /Logger/Channels subtree]]

* [[/Logger ODB tree| /Logger tree]] * [[Keys in the ODB /Logger/Channels subtree| /Logger/Channels subtree]]

The MIDAS package after [[Compilation & Build]] will contain a new directory ...) and the images (in {{Filepath|path=../bin}}) will be placed. Most of the MIDAS applications are located here. There a few other applications that can be m

...n;">''mevb''</span> is an event builder application which takes the MIDAS data output from several frontends, and assembles them into a new overall MIDAS event.

<div id="midas.log"></div> == MIDAS Log file ==

...It presents the most useful information about the current condition of the MIDAS Acquisition system in a compact form. * Logger information and statistics if [[mlogger]] is active.

...later playback through the midas history webpage. The [[Mlogger|midas data logger]] will automatically grab the current image from the webcam, and store it o * libcurl must be available when compiling midas

* [[Keys in the ODB /Logger tree| /Logger tree]] * [[Keys in the ODB /Logger/SQL subtree |/Logger/SQL subtree]]

...o perform various functions e.g. data logging, web server etc. They run as MIDAS [[#Clients]]. ...Alarms and History system information. These buffers are managed by the [[Midas Core#The Buffer Manager|Buffer Manager]].

== MIDAS event structure == A diagram of the structure of an event in MIDAS format is shown below:

* [[Data Logger]] ...Data dir STRING 1 256 3m 0 RWD /home/midas/online

...s of the Midas documentation, it is still a real challenge to describe the Midas package in a clear, concise and useful way. On this third attempt, we rewor The documentation of the '''MIDAS code''' is still generated by Doxygen and can be found at

=== Stop all front-ends and programs connected to midas === Manually kill any lingering frontends and other midas programs ([[mlogger]], [[mhttpd]], etc.).

* [[Keys in the ODB /Logger tree|/Logger ODB tree]] * [[Keys in the ODB /Logger/History subtree|/Logger/History subtree]]

<strong>MIDAS around the world</strong> <td><strong>Data Rate</strong></td>

...nables/disables writing of data. A quick test run can then be made without data logging (see Figure 2). Write data : n

...a frontend using the ''EQUIPMENT structure'' defined in ''midas.h'' in the MIDAS package. ...nt declarations can be found in the ..midas/examples subdirectories in the MIDAS package.

[local:midas:S]/>ls -lrt /experiment Name STRING 1 32 7s 0 RWD midas

* [[MIDAS Event Construction]] * [[#MIDAS Format Event|"MIDAS"]]

The MIDAS {{Utility|name=odbedit}} utility is primarily an [[Online Database (ODB) [-h hostname ] : see [[Common Parameters to MIDAS Utilities #Midas host (hostname)|common parameters]]

== Introduction to Event building in MIDAS == MIDAS supports event building through a dedicated <span style=" font-style:bold;

[[Keys in the ODB /Logger tree#Data Dir|/Logger/Data dir]]. ...appear by default in the /<span style="color: purple; font-style:italic;">/Logger</span> tree, but can be created by the user if desired. If this key is pres

==Midas components== ...rall Midas system diagram]] to see how these elements interact to form the MIDAS system.

* [[Mhformat|MIDAS history file format]] * [[Keys in the ODB /Logger tree|/Logger ODB tree]]

The MIDAS Online Data Base (ODB) is the main communication platform between MIDAS applications. It contains all the information needed to run an experiment. ...Windows NT registry. ODB keys can be dynamically created and deleted. The data associated with a key can be of different types such as: byte, words, doubl

...s. Tags are of the format <code>midas-YEAR-MONTH-SUFFIX</code>, e.g. <code>midas-2019-06-b</code>. This page details the major changes in each release, and Release <code>midas-2020-12-a</code>

* [https://midas.psi.ch/elog/ '''Elog''' ] Midas status page for creating new entries. This mode is referred as the [[#Built

...n covers the various options available for customization when building the MIDAS system. The options fall into the following categories: ...ronment Variables]] must be defined before executing the [[#MIDAS Makefile|MIDAS Makefile]].

* [[Data Logger]] ...ger is still much used for getting a copy of the original data to a remote data storage. While there are many ways to do this independently of the acquisit

If the MIDAS web server [[mhttpd]] is running, the experiment can be accessed from the w * Data Logging Information

...shows you how to install the MIDAS packages on a linux box and create a '''MIDAS experiment'''. The linux box will be called the MIDAS '''''experiment host'''''.

{{mhttpdpages3|[[Custom Page Features]]|[[/Custom ODB tree]]|[[Mhttpd.js|MIDAS Javascript library]]}} ...MIDAS web interface. These custom pages usually display ODB parameters or data to the user. They can contain specific links to the ODB so the user may als

{{mhttpdpages3|[[Mhttpd.js|MIDAS Javascript Library]]|[[odbedit]]|[[Security]]}} The {{Utility|name=mhttpd}} utility runs the '''MIDAS Web Server''' which allows the user to communicate with an experiment using

* [[Mhttpd.js|MIDAS Javascript library]] = MIDAS JSON-RPC interface =

[local:midas:S]/>ls -lrt /experiment Name STRING 1 32 14s 0 RWD midas

This page describes setting up a MIDAS experiment at TRIUMF. This information can be adapted for other sites. * '''MIDASSYS''' Base directory of the MIDAS package, midas and mxml should be at the same level.

This page will document the MIDAS AJAX functions accessible through special mhttpd URLs. These AJAX functions are typically accessed from browser javascript using the MIDAS [[mhttpd.js]] library.

Format STRING 1 8 9h 0 RWD MIDAS [0] Data still buffered