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URL:
http://www.dnp.org
DNP was developed as a three-layer asynchronous
protocol suitable for use on slow serial links and radios, so like IEC 60870-5
it is strongly focused on compactness, data integrity and reliability in noisy
environments. It incorporates the best features of the many proprietary
protocols that preceded it, such as select-before-operate and direct controls,
accurately timestamped data, broadcasting, freezing accumulators, scan groups,
and report-by-exception. It also supports features that were very advanced for
the time it was created, including spontaneous reporting, multiple masters,
peer-to-peer communications, floating-point data, wild-card requests, file
transfer, limited self-description, and vendor-extension.
Keywords:
protocol, monitoring, control, SCADA, substations, field device,
pole-top,
serial, wireless, data link layer, application layer, multi-drop,
bridging,
broadcast, water utility, power utility, reliability, availability, de facto
standard, open systems, consortia
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