The LyrTech data acquisition system uses TCP connections to transfer data between the various components of the system. As a result these components may be distributed in different workstations but they may all be in the same workstation.

The protocols and data format used for these data links is the same in all cases and hence a number of configurations is possible. 

Two potential configurations are 

1)  LyrTech cPCI crate (VHS-ADCs) => Data Merge => Data Storage

2)  LyrTech cPCI crate (VHS-ADCs) => Data Merge => Event Builder => Data Storage

The TCP ports used are defined via configuration files. In the case of the Event Builder the input and output ports can be changed via its GUI.


1)  LyrTech cPCI crate
    This uses 1 TCP connection for each ADC module. Only the destination port number of the first module needs to be defined. The remaining modules use consecutive port numbers.
    startup file contains configuration information   c:\MIDAS\LyrTech\StartUp\RTDEX4.cmd

  netstring TS_Server "192.168.0.203"   defines the IP address or name of the data destination
  netint TS_Port  11011                 defines the first of a group of IP ports for the data destination

2)  Merge process
    This has 1 TCP port for each ADC module to read the data sent by the LyrTech system. 
      input configuration file  /MIDAS/Merger/IDS/GS_configuration 
     incoming links defined by statement   links 4  /MIDAS/Merger/link64 11011
    defines 4 links starting at port 11011   The link software is /MIDAS/Merger/link64

      output configuration file  /MIDAS/Merger/IDSMerger

   The Merge combines the incoming data stream into 1 outgoing stream 
   
  netstring TS_Server "localhost"   defines the IP address or name of the data destination
  netint TS_Port  10305                 defines the IP port for the data destination


3)  Event Builder process


4)  Data Storage process (Tape Server)
    configuration file   /MIDAS/config/TS_10205/TS_configuration

   The record /MIDAS/TapeServer/Linux64/linkTCP   defines the IP port used by data input (default is 10305)

   The record  file_path_base  /TapeData      defines the base directory used for writing data to disc. Note that this may be a symlink.