Connection element for producing a wired connection between a first and second unit

The disclosed embodiments relate to a system including a connection element for producing a wired connection between a first unit and a second unit, the connection element comprising a diagnostic module; wherein the diagnostic module comprises: a receiving interface, which is set up to receive data from the first unit over a wired data connection, a memory module, which is set up to store the data received from the first unit, and a read-out interface, which is set up to output the data stored by the memory module over a wireless data connection. The disclosed embodiments furthermore relate to a system including the first unit with the connection element directly connected to the first unit, as well as a system with the first unit and the second unit. The disclosed embodiments finally also relate to a method for producing a wired connection.