A heavy ion beam diagnostic for the tokamak ISTTOK has been developed with the aim of measuring the temporal evolution of the electron density, plasma potential, electron temperature and poloidal magnetic field radial profiles. The control and data acquisition system for this diagnostic is described. This system was designed in a modular and versatile approach based on locally developed VME timing, waveform generator and digitizer modules. Its integration into the ISTTOK control and data acquisition system as well as the first experimental results are also reported.