DS DS/EN 60870-5-1
DS DSEN 60870-5-1 1996-FEB-14 Telecontrol equpment and systems - Part 5 Transmsson protocols - Secton one Transmsson frame formats
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Covers asynchronous data transmission with half duplex and duplex link protocols operating with window size one for message transfers. Specifies the basic requirements for services to be provided by the link plus physical layers, for telecontrol applications.