IC card reader/writer having a short-circuit detection capabilit

Details IC card reader/writer having a short-circuit detection capabilit IC card reader/writer having a short-circuit detection capabilit

1989-09-29

1991-07-23

Trafton, David

Registers

Coded record sensors

Testing

235441, 235492, G06K 700

Patent

active

050345990

ABSTRACT:
An IC card reader/writer has a short-circuit detector for determining, when an IC card is inserted in the reader/writer, whether or not any of connecting terminals for feeding a current to the IC card is short-circuited, and producing a resultant signal representative of the result of determination. A control is responsive to the resultant signal for performing, when the resultant signal does not indicate short-circuit, control such that the current is fed to the IC card via the connecting terminals. A reference voltage generator generates a reference voltage, while the short-circuit detector determines whether any of the connecting terminals is short-circuited or not by using the generated reference voltage.

REFERENCES:
patent: 4109161 (1978-08-01), Iijima
patent: 4785166 (1988-11-01), Kushima
patent: 4812634 (1989-03-01), Ohta et al.

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