Invalid Parity error in the Active Event view on a card swipe


When swiping a card, an Invalid Parity error occurs in the Active Event view or in the Access Event log.

Product Line

Andover Continuum


  • Active Event view
  • Access Event log


This can either be caused by a reader malfunction or the reader being wired incorrectly. Specifically on the reader wiring they may have swapped the Data and Clock lines.


Try swapping the Data and Clock line on the connector of the controller/IOU module.