Method and apparatus for signal transmission by phantom circuit

摘要

A method for transmitting a plurality of independent data signals between two modules connected to a communication link is provided. The communication link is a two lead wired connection. A first data signal is transmitted in form of a differential signal over the communication link. A second data signal is transmitted between both connected modules by adding the second data signal identically to both leads of the communication link. The second data signal is referencing a ground potential which is common to both connected modules.