02.02.2018 Views

Practical_modern_SCADA_protocols_-_dnp3,_60870-5_and_Related_Systems

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

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

Diagnostics are provided for observing DNP3 messages. Two means of accessing<br />

messages are provided. One may be used while carrying out configuration of an RTU. This<br />

looks at the DNP3 messages between the configuration PC <strong>and</strong> the RTU. A more general<br />

tool is also provided which is called the comm<strong>and</strong> line diagnostics. This operates at<br />

the RTU as DNP3 protocol analyzer by displaying all DNP3 message traffic. This is a<br />

software function built into the RTU, which is accessed by connecting a PC with terminal<br />

emulation software to one of the RTU ports.<br />

Some of the RTU diagnostics comm<strong>and</strong>s available <strong>and</strong> the general functionality can be<br />

seen in the following section.<br />

DNP3 diags<br />

This window displays communications between DNP3Config <strong>and</strong> the RTU that it<br />

is connected to. All protocol layers are available <strong>and</strong> can be selected for viewing. It does<br />

not display any communications from other RTUs. This tool is useful to diagnose DNP3<br />

communications between the attached RTU <strong>and</strong> remote RTU.<br />

Comm<strong>and</strong> line diagnostics allows direct observation of network messages <strong>and</strong> an alternate<br />

means of observing system <strong>and</strong> PDS information.<br />

When comm<strong>and</strong> line diagnostics is active, this data is sent as ASCII characters to<br />

a configured serial port. Terminal emulation software, such as HyperTerminal, NTTY,<br />

WINTTY, PROCOM or TELIX running on a PC will display the data.<br />

Here is the appearance of the DNP3Config window. The comm<strong>and</strong> line diagnostics<br />

operates as a terminal mode, so it will look a little different to this.

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!