source:

http://ams.pg.infn.it/~azzarel/work/tdr/TDRdescription.html#Data_acquisition_modes


Data acquisition modes
The simplest acquisition mode is the raw data mode, i.e. no data reduction is done. In such a case, all the 1024 silicon channels are transmitted to the Jinf.

    * Event size = 2048 bytes (1024 words of 16 bits).
    * Event format = S01, S02, K0 , S11, S12, K1 , S3191, S3192, K319 , K320 , ... , K384. The bits are shifted by three positions, so you will have to make a >>3 to get the correct ADC value.

In reduced or compressed data mode, only selected groups of channels ("clusters") are transmitted:

    * Variable event size.
    * Event format = (length-1), first, adcfirst, adcfirst+1 , ... , adcfirst+(length-1) , (length-1) , first, ...
      Here, the 'adc' values are signed short int, and you will have to divide them  by 8.0 to get the correct value. 'first' corresponds to the index of the first channel composing the cluster. An index from 0 to 639 corresponds to a cluster on the S-side, in index from 640 to 1023 corresponds to a cluster on the K-side.
    * At the end of the reduced event, for debugging purposes, the common noise values computed for the 16 VAs are given. Here, the common noise values are signed short int, and you will have to divide them  by 8.0 to get the correct value.

Each value is one word of 16 bits.

In the case of the mixed mode, the event is composed of both raw and reduced data, raw data being followed by the reduced data.



vc
  currently for each group in reduced mode 16 word are always added representing the common noice calculated

vc

calibration mode dataformat still missing