Asynchronous data transmission method and circuitry

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

H - Electricity

04

L

340/165

H04L 7/00 (2006.01) H04L 5/16 (2006.01) H04L 25/03 (2006.01)

Patent

CA 1213956

- 21 - ASYNCHRONOUS DATA TRANSMISSION METHOD AND CIRCUITRY 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. (Fig. 1)

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