Serial Bit Order

A serial bit stream is typically produced by a hardware or software Universal Asynchronous Receiver/Transmitter (UART). If one looks at the physical layer waveform for either an asynchronous or a synchronous serial bit stream using an oscilloscope, then one may notice that things are not quite as one expects. There are two things which could be unexpected:

So, what one sees on the oscilloscope is:

See also:

Prof. Gorry Fairhurst, School of Engineering, University of Aberdeen, Scotland. (2016)