Information exchange method in a communications controller comprising a central control unit (CCU) associated with a storage that provides a number of parameter/status and data areas equal to the maximum number of interfaces to be managed by the controller. The storage contains a line vector table which indicates the address of each area assigned to each interface. The exchange of the parameter/status information and data on the input/output bus (IO5) uses a minimum number of input/output operations controlled by the program stored in the storage (3).