Step by Step - Include a DAQ System

This page explains how to use all available data acquisition (DAQ) systems in ROME.

The Rome DAQ System

The Rome DAQ system writes the standard rome output. It also reads in output files from a previous execution of the analyzer. The data format is a root file containing root trees.

Modify the Framework Definition File

The Rome DAQ system is an integral part of ROME and will always be linked into the framework. Therefore the framework definition file does not need to be changed.

Modify the Configuration File

To activate the Rome DAQ specify 'rome' for the <DAQSystem> tag in the <Modes> section.

Output

To write out the trees, which you have defined in the definition file, set the <Write> and the <Fill> tag of the tree in the <Trees> section to true. Please make sure that the <OutputFilePath> tag in the <Paths> section is set correctly. All trees will be written to that directory.

Input

You can read in previously written output trees. To do that set the <Read> tag of the tree in the <Trees> section to true. Please make sure that the <InputFilePath> tag in the <Paths> section is set correctly.

You must also set the run numbers and/or filenames which you want to read. Therefore you have to edit the <RunNumbers>, the <EventNumbers> and the <InputFileNames> tag.

Modify the Source Code

Nothing has to be added to the source code.

You may also see the 'tree_write_read' example.

The Midas DAQ System

For an introduction to the MIDAS system please visit the MIDAS homepage.

There is an example for including the MIDAS DAQ in the rome package (examples/midas). Please read the README.txt in the directory.

The midas banks can be accessed over the gAnalyzer->GetMidasDAQ() handle. See also the Midas Banks section of the users guide.

The Database DAQ System

The database DAQ system reads the main input data from a database. This is only used when your event data is located in a database system. If you have run based input-data you can not use this DAQ system.

The following example is based on the stepbystep example. It is located under 'rome/examples/stepbystepdbdaq'.

Modify the Framework Definition File

Add the following lines to the folder definition (red tags are added):

<Folder>          <FolderName>PMTData</FolderName>          <FolderArray>10</FolderArray>          <DataBaseAccess>true</DataBaseAccess>          <Field>             <FieldName>ADC</FieldName>             <FieldType>Int_t</FieldType>             <FieldComment>ADC Value of a PMT</FieldComment>             <DataBaseName>mydatabase</DataBaseName>             <DataBasePath>"/PMT[run=# and event=##]/ADC"</DataBasePath>          </Field>       </Folder>

Modify the Configuration File

Add run and event numbers. For example :

<RunNumbers>1,2</RunNumbers>       <EventNumbers>1-4</EventNumbers>

Set the DAQ system to 'database' :

<Modes>          <DAQSystem>database</DAQSystem>       </Modes>

Add a database (under <MainConfiguration>) :

<DataBases>          <DataBase>             <Name>mydatabase</Name>             <Type>xml</Type>             <Connection>./xmldatabase;stepbystepdbdaq</Connection>          </DataBase>       </DataBases>

Modify the Source Code

Remove the first two lines in the event method of the PrintADCValues task. These are not needed anymore since we read the data from the database now. New code :

void SBSTPrintADCValues::Event() {    if (gAnalyzer->GetGSP()->GetOutputOnOff()) {       for (int i=0;i<10;i++)          cout << gAnalyzer->GetPMTDataAt(i)->GetADC() << endl;       cout << endl;    } }

The User DAQ System

You can make DAQ system for your experiment. ROME builder will make skeleton source code under include/daq and src/daq when you add DAQ in definition file.

The following example is based on the stepbystep example. It is located under 'rome/examples/stepbystepmydaq'.

Modify the Framework Definition File

Add the following lines.

<UserDAQSystems>           <UserDAQSystem>               <DAQSystemName>mydaq</DAQSystemName>           </UserDAQSystem>       </UserDAQSystems>

Modify the Configuration File

<DAQSystem>mydaq</DAQSystem>

Modify the Source Code

Edit src/daq/SBSmydaq.cpp and include/daq/SBSmydaq.h

	Matthias Schneebeli, Ryu Sawada
	e-mail: ryu.sawada@cern.ch