Abstract: Communications system including a master circuit having a master serial peripheral interface, SPI, device with an input MISO terminal. A plurality of slave circuits is provided for communication with the master circuit. Each slave includes a slave SPI device, an activation terminal, and an output switch for connecting an output MISO terminal to the input MISO terminal. The master circuit also includes a polling signal terminal for transmitting a polling signal to at least a first group of slave SPI devices for activating them. The master circuit 3 also has a plurality of output CS terminals, each being independently activatable to activate both the respective slave SPI device and the associated output switch.

Abstract: A joint-site structure for components to be connected by overlap friction welding. At least one step of at least one component, on which an axially set-back ring-shaped joining surface is situated, is provided with a radial undercut, in such a manner that on the face side, a region of this step that is unchanged in diameter forms a radial support ridge, which is connected with the at least one component by way of a heat throttle that is reduced in cross-section. The length of each step is designed in such a manner that when the face surface of the one component makes contact with the ring-shaped joining surface of the other component, the other face surfaces of these components, which surfaces lie opposite one another in the same radial position, are still exposed until completion of the friction-welding process.

Abstract: A joint-site structure for components to be connected by overlap friction welding. At least one step of at least one component, on which an axially set-back ring-shaped joining surface is situated, is provided with a radial undercut, in such a manner that on the face side, a region of this step that is unchanged in diameter forms a radial support ridge, which is connected with the at least one component by way of a heat throttle that is reduced in cross-section. The length of each step is designed in such a manner that when the face surface of the one component makes contact with the ring-shaped joining surface of the other component, the other face surfaces of these components, which surfaces lie opposite one another in the same radial position, are still exposed until completion of the friction-welding process.