  The new Belle II experiment at the asymmetric $e^+ e^-$ accelerator SuperKEKB
at KEK in Japan is designed to deliver a peak luminosity of
$8\times10^{35}\text{cm}^{-2}\text{s}^{-1}$. To perform high-precision track
reconstruction, e.g. for measurements of time-dependent CP-violating decays and
secondary vertices, the Belle II detector is equipped with a highly segmented
pixel detector (PXD). The high instantaneous luminosity and short bunch
crossing times result in a large stream of data in the PXD, which needs to be
significantly reduced for offline storage. The data reduction is performed
using an FPGA-based Data Acquisition Tracking and Concentrator Online Node
(DATCON), which uses information from the Belle II silicon strip vertex
detector (SVD) surrounding the PXD to carry out online track reconstruction,
extrapolation to the PXD, and Region of Interest (ROI) determination on the
PXD. The data stream is reduced by a factor of ten with an ROI finding
efficiency of >90% for PXD hits inside the ROI down to 50 MeV in $p_\text{T}$
of the stable particles. We will present the current status of the
implementation of the track reconstruction using Hough transformations, and the
results obtained for simulated \Upsilon(4S) $\rightarrow \, B\bar{B}$ events.
