Bus system and carrying device with such a bus system

Abstract

A bus system, in particular a shelf rail bus system, comprising: - a first line (L1) for establishing an electrical reference potential (GND), - a second line (L2) for providing a supply voltage (VCC1) with a setpoint relative to the reference potential (GND), - at least a third line (L3), preferably a single third line (L3), for communicating signals and / or data, and - a power supply unit (4) which is electrically connected to the lines (L1, L2, L3) and is designed for supplying electrical power as well as communication to electronic devices (7A, 7B, 7C) that can be connected to the bus system, wherein the power supply unit (4) is designed to supply different types of devices with both electrical power and, after their identification, device-specific communication.wherein the power supply device (4) is configured to temporarily change the supply voltage (VCC1) in order to initiate a change of operating mode, and wherein the power supply device (4) has a detection mode in which the power supply device (4) is configured to detect identification data uniquely identifying an electronic device (7A, 7B) connected to the bus system from one or more electronic devices (7A, 7B) connected to the lines (L1, L2, L3), and the power supply device (4) is configured to enter detection mode in order to initiate the change of its operating mode.