The disclosure provides a method for transmitting data between a control device and at least one measurement device via a bus system. The method includes intercepting a lock operation in the software component and testing an associated lock type of the lock operation against a set of rules. Each module may be mounted on a support wall and includes back and shelf portions. The manufacturers andor providers of the master key and special lock retain copies of the master key. The positioning ruler is moved in a direction perpendicular to the conveying direction by a first driving mechanism.