Fieldbus converter FD-40, allows the integration of devices that only have serial RS-232 or RS-485 interfaces with PROFIBUS DP. FD-40 acts as a PROFIBUS DP slave module and uses PROFIBUS DP I/O-data to create a transparent connection to the serial interface. FD-40 can be used to integrate a great many different types of equipment, for example, measurement instruments, electronic scales, operator terminals, printers, identification systems, barcode readers and other automation equipment with an RS-232 or RS-485 interface into PROFIBUS DP-applications.