ADM485 - how does the fail-safe feature mentioned in the datasheet work

Document created by analog-archivist Employee on Feb 23, 2016
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RECEIVER OPEN CIRCUIT, FAIL-SAFE

The receiver input includes a fail-safe feature that guarantees a logic high on
the receiver when the inputs are open circuit or floating.

 
What does this mean - how does it work?

 

 

 

If you leave the Pins A or B open (not connected) at the ADM485
using the ADM485 as an Receiver you will receive at the Outout (Receiver Output
Pin R0) an logic One.

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