Transcription of Failsafe in RS-485 data buses - Texas Instruments
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Failsafe in RS-485 data buses - Texas Instruments
16 analog Applications JournalAnalog and Mixed-Signal 2004 Failsafe in RS-485 data busesIntroductionAfter bus-pin electrical overstress, the second most common cause of inquiries to the Texas Instruments (TI)Interface Applications Group is the unanticipated responseof differential, and in particular RS-485 *, line receivers toloss of input signal. When the response of a circuit isdesigned to provide a known state under this condition, itis commonly referred to as Failsafe . The intent of thisarticle is to share the answers to many of these questionsand to help the reader avoid similar there are many different data transmission stan-dards that employ differential signaling, the scope of thisarticle is limited to RS-485 -compatible circuits and standardusage.
16 Analog and Mixed-Signal Products www.ti.com/sc/analogapps 3Q 2004 Analog Applications Journal Failsafe in RS-485 data buses Introduction After bus-pin electrical overstress, the second most
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