Developments for a future DAQ framework DABC

The Data Acquisition Backbone Core DABC will provide a general software framework for DAQ tasks over the next years. It serves as test bed for FAIR detector tests, readout components tests, data flow investigations (switched event building) and DAQ controls. Specifically, the system must be able to handle a triggerless experiment with large data bandwidth like CBM [1]. Additionally, it is necessary to integrate the current GSI standard data acquisition systemMBS [2]. The huge installed MBS equipment cannot be replaced. Instead, MBS driven front-end components (readout) should be attachable as data sources to the new framework. The DABC replaces the MBS event building functionality. The XDAQ C++ software framework [3] developed for the CMS experiment at CERN was chosen as base for the first implementation of DABC. It features: Task management: One node may contain several XDAQ Executives (processes); each Executive may contain XDAQ Applications as threads. Each application may create additional threads (workloops). Data transfer management: Peer Transport and Messenger interfaces. Hardware integration: Hardware Access Library. Control support: state machines; process variable Infospaces; message and error loggers; web server for each Executive.