What does DSI and DPI stand for (Allen Bradley)?

kdcui

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Dec 2007
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Rockwell refers to their DSI or DPI devices but I can't find in any literature what this acronym stands for. My first hunch was Digital Serial Interface and Digital Parallel Interface, but that seemed too generic, and DPI / DSI always has a TM (trademark) symbol next to it, which seems to indicate it is a proprietary protocol.
 

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