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Apparatus for electromagnetic communication between a computer and a non-contact IC card

  • US 5,727,230 A
  • Filed: 04/24/1995
  • Issued: 03/10/1998
  • Est. Priority Date: 04/28/1994
  • Status: Expired due to Fees
First Claim
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1. A reader/writer for communicating with and providing communication between an external host computer and a noncontact IC card comprising:

  • input/output means electrically connected to an external host computer for inputting and outputting bidirectional signals to and from the external host computer;

    control means electrically connected to said input/output means for controlling transmission of signals between the external host computer and a noncontact. IC card;

    electromagnetic wave transmitter/receiver means electrically connected to said control means for transmitting to and receiving from the noncontact IC card bidirectional electromagnetic-wave signals, said control means determining whether a signal has been received from the external host computer through said input/output means and, if a signal has been received from the external host computer, determining whether the signal is a command or data and, if the signal is a command, executing the command and, if the signal is data, transferring the data to the noncontact IC card through said electromagnetic wave transmitter/receiver means and, if no signal has been received from the host computer, determining whether a signal has been received from the noncontact IC card through said electromagnetic wave transmitter/receiver means and, if a signal has been received from the noncontact IC card, transmitting the signal to the external host computer through said input/output means; and

    means for communicating with the noncontact IC card at a first baud rate and for communicating with the external host computer at a second baud rate, the second baud rate being different from the first baud rate.

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