USB interface converters enable the connection of serial devices via the USB interface. When the converter is plugged into the USB port, a virtual COM port is created by the Windows OS via plug'n'play, through which the software communication takes place. The converters are suitable for DIN rail or wall mounting. Particularly useful and indispensable in every service case are the small transducer plugs or cables that are plugged directly into the USB port of the PC.