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1.3 Abbreviations
BF
Bus error
DGND
Data transfer potential (reference potential to VP)
GSD
Device description data
PI
PROFIBUS and PROFINET International (user organization)
RTS
Request To Send
RxD/TxD-N
Receive/Transmit Data -N, A-line
RxD/TxD-P
Receive/Transmit Data -P, B-line
VP
Positive supply voltage (+5 V) for the terminating resistors