begin -- Start data taking in a data source


proc ::providerName::begin {sourceId runNumber title} { ... }


Starts data taking at the beginning of a run for the source identified by sourceId. The runNumber and title parameters are the run number and title of the run. They can be ignored if the data source has specified that it does not have the capability of associatig run numbers and titles with data taking runs.

The sourceId parameter is, as usual, the value of the sourceid dict element passed to the start command.