Question: What are the two methods of transporting messages under IEC 60870-5. Explain them. [4 Marks]…

What are the two methods of transporting messages under IEC 60870-5. Explain them. [4 Marks]

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STARTDT( start data transfer) and STOPDT (stop data transfer) are used by the master to control the master to control the data transfer from the slave. When the connection is established, user data is not automatically enabled in the slave until it receives a STARTDT con response to acknowledge the master request. Once this procedure is concluded, the slave can send data to the master.

The master can interrupt the monitor data flow at any time sending a STOPDT act command to the slave. Master Slave STARTD.act STARTDT.con Monitor Points Monitor Points In some circumstances the master unit may not support STARTDT and STOPDT messages. The module may also be tested with a simulator software that does not support these features. During these situations the user may want to disable the STARTDT and STOPDT features using the following parameter override startDT 1 #Used to ignore STARTDT/STOPDT state (0=No, 1=Yes ) So if this parameter is set to 1 the module will ignore the STARTDT and STOPDT requests by the master unit Cyclic Data Transmission Object address ranges for cyclic data transmission are configurable via the IEC 60870-5 Class 2 Data and Counters Setup (see Section 6.3). Any compatible ASDU data type can be separately selected for each range of points regardless of the configured default object type. Cyclic data is sent in the order they are listed in the Class 2 Data Setup. The meter always transmits cyclic data using a sequence of information objects ASDU with the SQ bit in the variable structure qualifier set to 0. IEC 60870-5-101 Cyclic Transmission In IEC 60870-5-101, the meter responds to class 2 data requests with data configured for cyclic transmission if there are no higher priority messages ready for transmission. An interrogation command interrupts a cyclic transmission sequence, which is automatically restarted after the interrogation command has been responded. IEC 60870-5-104 Cyclic Transmission In IEC 60870-5-104, configured cyclic data is transmitted periodically to the selected controlling station after it confirms start of data transfer. An interrogation command

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