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Chapter 4. More information

Ë The sbind command here binds all of the spectra into the Xamine visualization program. SpecTcl

spectra need not be visible to Xamine, this command ensures they will be.

Ì Unless told to do so, the GUI’s object browser will not reﬂect deﬁnitions that have been made

outside the gui. This command tells the gui’s object browser (widget .gui.b), to rebuild the object

tree.

Í By convention, most experiments use the environment variable DAQHOST to store the name of the

host on which Readout runs. This code sets daqsource to be the value of the DAQHOST

environment variable if it is deﬁned, or to localhost if it is not. This establishes the system from

which data will be analyzed.

Î Connections are speciﬁed to remote data acquisition systems using URL notation. This command

sets url to be the url corresponding to the spectrodaq server buffer request socket for the host

daqsource.

Ï The SpecTcl attach command speciﬁes the data source from which SpecTcl will process buffers. In

this case we specify that we will accpet buffers from a pipe to which the program spectcldaq in the

data acqusition system will be attached. spectcldaq accepts data from the speciﬁed source, sampling

event data, and dumps the data to its standard output (the other end of the pipe SpecTcl is taking

buffers from.

Ð Once SpecTcl is attached to a data source the start command starts processing data from that data

source.

4.2. Using the Readout GUI ReadoutShell

ReadoutShell provides a graphical user interface front end to the readout application. This front end

supports:

• Starts the readout program on an arbitrary host.

• Starting, stopping, pausing, resuming runs

• Setting run parameters such as the title, run number and scaler readout period.

• Enabling or disabling software to start or stop recording event data to disk for later detailed analysis.

• Performing timed runs, that is runs that have a ﬁxed pre-determined run time.

• User programmable actions to be performed when run state transitions are performed, or the Readout

program started or restarted.

• Management of data sets and symbolic links so that event data can be treated as grouped with any

arbitrary associated data ﬁles, or as just a directory containing the event data.

In this section we will create a script to start up the ReadoutShell in such a way that our readout program,

~/experiment/readout/Readout will be started by it. We will ensure our readout runs on the host

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ADC 400F Handbuch Seite 46