Title :
The new implementation of the event building protocol for the ALEPH data acquisition system
Author :
Perlas, J.A. ; Harvey, J. ; Jost, B. ; Mato, P.
Author_Institution :
CERN, Geneva, Switzerland
fDate :
2/1/1994 12:00:00 AM
Abstract :
The flow of data through the ALEPH readout system is effected under the control of a special protocol between the various readout stages. The software library used to implement this protocol has been re-engineered using the finite state machine modelling technique. The state of each system component can be observed at any given time and this has greatly simplified the detection of, and recovery from, protocol errors. The model and its implementation are described together with their integration with the applications which are used by the operator to control data taking. Operational experience gained with this protocol implementation during the whole 1992 running period will also be given to show the advantages of this design
Keywords :
calorimeters; data acquisition; finite state machines; physics computing; position sensitive particle detectors; proportional counters; protocols; ALEPH; data acquisition system; data transfer protocol; event building protocol; finite state machine modelling; protocol errors; Assembly systems; Automata; Control systems; Data acquisition; Detectors; Event detection; Fastbus; Protocols; Software libraries;
Journal_Title :
Nuclear Science, IEEE Transactions on
