In order to simplify the HMI design of HMI surfaces for operating and observing automation components with the aid of an HMI unit, HMI data are derived directly from the engineering process. The pulse signal generating circuit generates a pulse signal. 4 \u03bcm as established by a PMI Capillary Flow Porometer. The Z-height control tab extends from the reaction housing and engages a wall edge of a skirt extending from the airbag cover. Either tracking may be used to change the locations sampled andor beam characteristics, such as centering the locations and beam focus on the selected gate location. The invention also concerns related aspects including processes for the preparation of the compounds, pharmaceutical compositions containing one or more of those compounds and especially their use as anti-infectives.