After having mounted the modules and applied the voltage to the central unit, ibaPQU-S detects the modules and checks the firmware version.

ibaPQU-S has a so-called "overall release version". This version contains the current software version of the central unit as well as the firmware versions of the modules.

When the firmware version of a module does not match the "overall release version" of the central unit, ibaPQU-S does an automatic up or downgrade of the module. After that the module is ready for use.