6F2T0207 (0.01)GRE200 (5,6)- 948 -11.5.5 Communication interface in the IEC 60870-5-103 standard(i) Spontaneous eventsWhen events are generated in the IED, they are transferred to the master station. The eventtransferred is grouped into the Function-type (FUN) and the Information numbers (INF).(ii) General interrogation1“GI request” is used when it is required to read the IED status, the Function-types (FUNs),and the Information numbers (INFs). The status and others are reported during the GI cycle.(iii) Cyclic measurementsMeasured values are cyclically generated using Type ID=3 or 9; they are read in the IED usinga Class 2 poll. The generating rate of new measured values is possible to program.(iv) Commands2The user can customize the supported commands. The IED can replay for unsupportedcommands using the cause of transmission (COT) negative acknowledgement of a command.(v) Test mode3For the process in the control system, both spontaneous messages and polled measured valuesare designated by the means in the ‘test mode’ of “CAUSE OF TRANSMISSION”. The meansdenoted the ‘test mode’ of “CAUSE OF TRANSMISSION = 7” is normally used for the messagestransmitted with COT=1 (spontaneous) or COT=2 (cyclic).(vi) Blocking of monitor direction4If blocking the monitor direction is activated in the protection equipment, all indications andmeasurands are never transmitted.1Note: With regard to the GI list, seeAppendix IEC 60870-5-103 interoperability (→page1118). When the user wishes to understand the details, refer to the section 7.4.3 ofthe IEC 60870-5-103 standard.2Note: For details, refer to the section 7.4.4 of the IEC 60870-5-103 standard.3Note: For details, refer to the section 7.4.5 of the IEC 60870-5-103 standard.4Note: For details, refer to the section 7.4.6 of the IEC 60870-5-103 standard.