The Griesser GPA (Griesser Protocol Analyzer) app can decode, record and save KNX bus telegrams of the type 6-byte Griesser object. The GPA app works as a supplement to the Bus or Group Monitor integrated in the ETS. The Griesser GPA app must be launched separately from the Bus or Group Monitor and simultaneously records all KNX telegrams. As it does so, the Griesser object telegrams are recorded in decoded form. The GPA app offers the same functions as the Bus and Group Monitor except that it interprets the proprietary Griesser 6-byte object and decodes the sectors, the priority and the command.