Feature listing
Introduction
This section describes the implementation of the Midas features. Each Feature is described and make reference to the ODB structure and application where needed.
Alarm System
Analyzer
Buffer Manager
Data Analysis
Data Logger
Data storage options
data compression
Secondary data logging (lazylogger)
Electronic Logbook (ELOG)
External (elog package)
Internal elog
exptab (experiment table)
Event Filtering
Frontend Operation
History System
history format
hot-link Event notification mechanism
Message System
Online Database (ODB)
Remote Access Server (mserver)
Run Control
Run States and Transitions
Run Sequencer
A new sequencer for starting and stopping runs was implemented in Jun 2011. Since then development has continued, with more commands being added, and the option of using a Midas Script Language (MSL) for commands, in addition to the XML language.
The sequencer runs inside mhttpd, and creates a new ODB subdirectory /Sequencer. Pressing the Sequencer button (if shown) on the mhttpd main status page will display the Sequencer page. The sequencer runs scripts in XML or MSL (Midas Script Language) format, which reside on the server (where mhttpd is running).
The sequencer is stateless, meaning that even if mhttpd is stopped and restarted, it resumes operation from where it has been stopped.
Sequencer Commands
The following commands are implemented in the MIDAS sequencer. The upper syntax is for the XML file, the lower for the MSL (Midas Script Language).
Variable names are indicated in italic, options are enclosed in [brackets].