IC card having two output buffers
Communications network using IC cards
Processing system for enabling data communication with a self-diagnose device
Data transmission system for a portable data storage medium
Processing system which transmits a predetermined error code upon detection of an incorrect transmission code
Data processing system
IC card processing system capable of determing send timing between an IC card and an accepting device Patent #: 5414835
ApplicationNo. 411808 filed on 04/10/1995
US Classes:710/5, Input/Output command process714/48, Error detection or notification714/799Error/fault detection technique
ExaminersPrimary: Meky, Moustafa M.
Attorney, Agent or Firm
Foreign Patent References
International ClassesG06F 011/00
Foreign Application Priority Data1993-09-10 JP
AbstractThe present invention provides a method of controlling an IC card reader/writer which is low in cost and simple in structure using a UART which is a universal transmission circuit. A transmission line and a receive line of the UART are directly connected to each other for use as an SIO line of said IC card. In a command transmission/receive control, at the time of transmission processing the same character as a preceding one is transmitted when a framing error is detected and a next character is transmitted when an echo back is normally received upon reception of an echo back character after transmission of one character. At the time of a succeeding receive processing, the same command processing is executed again upon termination of the transmission/receive processing when a parity error is generated in a received character.