This setting is used when you want to set the card minimum character size for situations where the reader does not send a fixed number of characters, only the reading value, and the cards are registered with a fixed number of characters, with zeroes to the left of the value.
To set the number of physical identifier characters > tab Users > group Clients > action Configure Authentication > tab Advanced
Make the necessary settings, considering:
Set the number of characters expected when reading physical identifiers;
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Number of characters.