  In this paper, we present a complete Data Acquisition System (DAQ) together
with the readout mechanisms for the J-PET tomography scanner. In general
detector readout chain is constructed out of Front-End Electronics (FEE),
measurement devices like Time-to-Digital or Analog-to-Digital Converters (TDCs
or ADCs), data collectors and storage. We have developed a system capable for
maintaining continuous readout of digitized data without preliminary selection.
Such operation mode results in up to 8 Gbps data stream, therefore it is
required to introduce a dedicated module for online event building and feature
extraction. The Central Controller Module, equipped with Xilinx Zynq SoC and 16
optical transceivers serves as such true real time computing facility. Our
solution for the continuous data recording (trigger-less) is a novel approach
in such detector systems and assures that most of the information is preserved
on the storage for further, high-level processing. Signal discrimination
applies an unique method of using LVDS buffers located in the FPGA fabric.
