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Practical_modern_SCADA_protocols_-_dnp3,_60870-5_and_Related_Systems

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480 <strong>Practical</strong> Modern <strong>SCADA</strong> Protocols: DNP3, <strong>60870</strong>.5 <strong>and</strong> <strong>Related</strong> <strong>Systems</strong><br />

Communication 2<br />

Interpret the following data stream from the same <strong>60870</strong>-5-101 system as communication<br />

1. Assume a structured Information Object Address of 3 octets.<br />

68 0B 0B 68 73 02 01 64 01 06 00 00 00 00 14 EF 16 E5 68 25<br />

25 68 53 02 01 0B 05 14 01 01 00 05 12 00 00 01 00 01 74 0D<br />

00 01 00 02 0B 00 00 02 00 02 01 00 00 03 00 02 00 00 00 AA 16<br />

How many Messages are there?<br />

Explain the message sequence:<br />

For each message identify the following, as appropriate:<br />

Control byte:<br />

Function Code:<br />

Station Address:<br />

Type code:<br />

Variable Sequence Qualifier:<br />

Cause of Transmission:<br />

Common Address:<br />

Information Object Address(es)<br />

Data Values:<br />

Quality Descriptor (QDS )

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