Asynchronous data transmission method and circuitry

Details Asynchronous data transmission method and circuitry Asynchronous data transmission method and circuitry

1982-11-22

1984-06-12

Schreyer, Stafford D.

Telegraphy

Systems

Automatic

375113, H04L 1526

Patent

active

044543832

ABSTRACT:
A method and circuitry are disclosed for asynchronously transmitting binary data over a communication pair without the use of start or stop bits. During a non-data transmitting state a quiescent differential voltage, which is intermediate to the binary data differential voltage levels, is placed on the pair. The start of a data transmission is signaled by a transition of the differential voltage from the quiescent state voltage to the binary voltage of the first data bit of the data transmission. Since all data transmissions are of known bit lengths, the end of a data transmission is determined by counting data bits.

REFERENCES:
patent: 3566032 (1971-02-01), Carbone et al.
patent: 4314109 (1982-02-01), Sekiguchi

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