Methods and arrangements for arranging data communication between electronic devices in a transportation means

An electronic controller device of a transportation means for controlling at least one electronic device, wherein the controller device comprises:

• a power bus supply interface for supplying an operating voltage to said power bus,
• a controller device data bus interface for carrying out data communication by means of said data bus,
• a transmitter configured to send an addressing query on said data bus for causing said at least one electronic device to start addressing operations, which addressing query involves information of a limit value sent on said data bus;
• wherein said at least one electronic device has to receive a voltage higher than that limit value from the power bus in order to start the addressing operations.

A method for performing addressing operations in an electronic device of a transportation means, the method comprising:

• receiving an operating voltage from a power bus of the transportation means,
• conveying the operating voltage forward on said power bus,
• carrying out data communication via a data bus,
• reducing the operating voltage conveyed to the power bus to a voltage in a controlled manner lower than the received operating voltage but different from zero in response to the received operating voltage being higher than a predetermined first limit value and the device not having performed the addressing operations to carry out addressed data communication by means of said data bus, and
• omitting to perform said controlled voltage reduction in response to at least one of the following being satisfied:
• the received operating voltage is lower than said predetermined first limit value
• the device has performed said addressing operations.