Abstract: A polyfunction programmable data receiver comprising means for receiving a string of serial data followed by a control signal; means for detecting said signal comprising a pulse length analyzer, and a counter and a comparator; bidirectional means for setting up a digital word to be identified or for providing in parallel the data of said string according to the status of a mode selection circuit; means for providing an output signal if the comparison between said serial string and said set up digital word is favorable when the receiver operates as identifier, or an enabling signal when the receiver operates as a series/parallel converter. Some applications of this circuit are also disclosed.