Arrangements for transmitting electrical signals between two dev

Details Arrangements for transmitting electrical signals between two dev Arrangements for transmitting electrical signals between two dev

1978-06-30

1980-08-12

Yusko, Donald J.

Communications: electrical

Digital comparator systems

178 661, 340167A, 340168R, 340170, H04L 700, H04Q 900

Patent

active

042175720

ABSTRACT:
A system for transmitting digital signals between a fixed transmitter and a portable receiver which are temporarily interconnected by physical contacts which employs a single pair of contacts and a bidirectional data transfer technique to enhance the integrity of the data transfer. The single pair of contacts minimizes the possibility of data loss or contamination due to problems associated with temporary interconnecting and support a time-shared data transfer from a transmitter, which provides both data and synchronizing signals via a duration modulation technique on a pair of bipolar generators to a comparison receiver. The receiver synchronously acknowledges reception and provides, in turn, data back to the transmitter via a digital modulation of a signal current generator. A basic embodiment teaches the use of the apparatus as a secure data transmission means in a credit card reader, while an expanded embodiment shows the organization of a digital memory interconnection and data transfer scheme using the apparatus discloses.

REFERENCES:
patent: 3475727 (1969-10-01), Young et al.
patent: 3618025 (1971-11-01), Tomozawa
patent: 3618025 (1971-11-01), Tomozawa
patent: 3903504 (1975-09-01), Rogers et al.
patent: 3939304 (1976-02-01), Ribes
patent: 3959772 (1976-08-01), Wakasa et al.
patent: 4014002 (1977-03-01), Tucker
patent: 4114138 (1978-09-01), Demers

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