Method for automatically measuring elementary time unit for communication peripherals dedicated to smart cards

(57) Summary book invention relates to the method of measuring basic unit time (ETU=Elementary Time Unit) in the case of the dialog between a reader and a chip card so that it may constitute arrangement (dispositif de lecture) of a reader. This method consists of measuring the time between taking the downward edge of a start bit into consideration, taking the rise edge of the above-mentioned start bit into consideration and the above-mentioned downward edge, and rise edge, and the automatic proofreading of the automaton for communication of it is attained in this way. In chip card permanent communication peripheral equipment, the present invention is applied preferably.