The output of device memories (DH and CP) for S0-bus stations is done with an other concept as for normal ports. The reason is, that a S0-bus port may have up to 8 terminal devices arranged. As normally the position (=DI) of a terminal device on S0-bus is unknown to the user, therefore this value is handled like a SERVICE INDICATOR (values see Abschnitt 78.9 parameter ’DI’). In this case the DISPS puts out the position (TSI) and the device memories of ALL terminal devices which correspond to the given service. The TSI (terminal selection identifier) defines the physical position of a terminal device at the S0-bus. This method is only necessary if the user take circuit (CIR) or line address (LN), because in this cases a device is not addressed definitely. LODEN, STNO, CRF and DTI input select exactly one device and produce only an output of the device memories belonging to it! The LODEN of the terminal devices can be determined with the command LST,SW,LODEN,CIR/LN,.... and thereby the position (see column DI/TSI) is also shown.