Apparatus for an automatic speed and data length selection of an

Details Apparatus for an automatic speed and data length selection of an Apparatus for an automatic speed and data length selection of an

1996-11-19

2000-01-18

Olms, Douglas W.

Multiplex communications

Diagnostic testing

Determination of communication parameters

370230, 370235, 370465, H04J 314

Patent

active

060163097

ABSTRACT:
To establish the communication between two devices connected through an asynchronous data link, an adapter for automatically identifies configuration parameters. The configuration parameters may be the transmission speed, the data bits length (seven or eight), the parity (odd or even) if existing and the number of stop bits (one or two). Thus, there are six combinations of the four parameters. Each one of the configuration is detected by an adapter which is independent from the others. It comprises a control circuit (170) receiving deserialized data bits signal (RXD) from a connector (120), a clock generator (160) for generating clock signals and varying the clock frequency so as to adapt to asynchronous data transmission speed, a timer (220) for synchronizing the number of data bytes so as to adapt to the data bit length and counters for counting the number of times a predetermined configuration matches. A parity checker may be also implemented in case a parity bit is used in the data transmission. The six adapters may be connected in parallel by the RXD signal so that each adapter operates simultaneously so that each counter may inform first the microcontroller of the configuration detected once it is sure this configuration is not randomly detected.

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