A method for selecting an operating mode for a frame-based communications network consisting of a plurality of stations attached to a transmission medium. In setting the stator coils on the coil holder, the stator coils are sequentially set on the coil holder in a predetermined direction, which is a coil setting direction, from the starting stator coil so as to overlap one another. The linkage element has first and second arms, which have opposing, inwardly facing arcuate engagement surfaces for engaging the valve pin guiding element. When a user selects the CMC module from the onscreen display, the user is presented with a text console, where the user can login to a text terminal interface of the CMC module. Wavefront measurement systems and methods may help position and isolate the eye from ambient light. The invention also relates to an additional device, a corresponding method and a computer program.