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Is There Some Sort of Error Checking Used When Reading or Encoding a Card? : ZBA F A Q



Q: Is There Some Sort of Error Checking Used When Reading or Encoding a Card?

Yes. ISO encoded cards have a parity bit in each data
character. Each track of data has a character called an LRC.
This LRC character is a track checksum that insures all track
data bits are correct. Card encoders calculate parity and LRC
and encode this error checking information on the tracks
along with the encoded data. Most encoders read after they
write card data. Most card readers check both parity and LRC
before transmitting data.