Eaton Electrical PROFIBUS-DP EZ204-DP - Manual (Page 203)

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Topology Geometric structure of a network or circuit arrangement.
UART Abbreviation for “Universal Asynchronous Receiver/
Transmitter”. A UART is a logic circuit used for converting an
asynchronous serial data sequence into a bit-parallel data
sequence or vice versa.
Unidirectional Working in one direction.