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ISO1500: failsafe protection

Part Number: ISO1500

Team, 

  • The datasheet claims failsafe protection on the bus pins for “open, short, and idle” conditions.  Does the “short” condition include shorts to 24V, or only between the bus pins themselves?  The datasheet implies the latter (unfortunately).
  • If 24V bus short protection is NOT supported, do you have a recommended external protection solution?  I was thinking a Zener on each bus pin might work, but I want to confirm.

Thanks

Viktorija