  The CONCERTO spectral-imaging instrument was installed at the Atacama
Pathfinder EXperiment (APEX) 12-meter telescope in April 2021. It has been
designed to look at radiation emitted by ionised carbon atoms, [CII], and use
the "intensity Mapping" technique to set the first constraints on the power
spectrum of dusty star-forming galaxies. The instrument features two arrays of
2152 pixels constituted of Lumped Element Kinectic Inductance Detectors (LEKID)
operated at cryogenic temperatures, cold optics and a fast Fourier Transform
Spectrometer (FTS). To readout and operate the instrument, a newly designed
electronic system hosted in five microTCA crates and composed of twelve readout
boards and two control boards was designed and commissioned. The architecture
and the performances are presented in this paper.
