Patent ID: 8688291

Claim:
A method for data exchange in a transport system, the method comprising the steps of: transferring control commands from a control unit to a vehicle; transferring status messages from the vehicle to the control unit; providing a changeover signal by a signal generator, and switching the changeover signal to a first data line and a second data line; changing a time sequence of the changeover signal to transfer at least one of the control commands and the status messages via changes in the time sequence of the changeover signal; operating a first switching device in the control unit to change positive half-waves of the changeover signal; and operating a second switching device in the vehicle to change negative half-waves of the changeover signal in a circuit formed by the first and second data lines, such that binary values are transferred back-and-forth between the control unit and the vehicle, data exchange of the control commands and status messages occurring substantially simultaneously via a changed changeover signal.