The user interface modules are an optimized design for featuring an ergonomic user interfaces for existing devices or those to be developed. They can be interfaced from arbitrary devices using a serial interface. Even low-powered 8-bit microcontroller will be able to do this job nicely. The serial communication follows a master-slave scheme: The device of our customer controls the base application and communicates as a master with the LCM2 module. The module then executes the graphical instructions sent by the master.