Card reading control system - interrogates card using security code which is deciphered by card circuit, then transmits coded reply to system

摘要

The control system is designed to automatically recognise a data containing card. The control system uses a photo-detector reads the data and carries out a companion with stored data within the system. In case of coincidence, the system emits a predetermined signal. The card includes programmed calculating circuits for deciphering a message from the machine, which is in the form of a predetermined security code. The message generates from memorised data in the card another coded message. This other coded message is transmitted to the control systems card reader. The control system incorporates a microprocessor (15), has line (14), a memory (16) and a coupler (18).