5.In working status, put the attendance card in the antenna inductive zone (2cm) of internal and external cardreader , the cardreader will tootle and the screen will display ID number or the card number .
9.This paper discusses the designing of ISO/IEC14443TYPE B cardreader using Philips Contactless Smart Cards reader IC RC531,including the operation principle of TYPE B cards and the C51implementation of the cardreader.