The diagnostic tool supports the Windows XP and Windows 7 operating systems and is based on the WinPcap interface. The tool allows both retroactive evaluation of stored network records in the pcap file format and an analysis of the network traffic in real time. A user-friendly interface plus overview functions for the typical features of a SERCOS III network, such as topology, communications phases and service channel transmission, enable a fast and targeted launch of the analysis process. Experienced users are additionally provided with comprehensive protocol and analysis functions. Different views and filter mechanisms allow the customized evaluation of SERCOS III real time telegrams and other Ethernet telegrams based on the individual requirements of the user. Users can add additional functions to the SERCOS Monitor via user-specific plug-ins, if needed.