Even with the widespread use of universal serial bus (USB), for many of our customers who use the drives, serial ports are still an important interface. Not only on computers but also digital cameras, printing equipment, modems and a wide range of network equipment for industrial automation, continue to use the serial port connectivity. (Although, if you examine the computers made in recent years, is likely to find a single serial port along with, in some models, a parallel port.)
One of the great advantages of serial communications is simplicity achieved by taking 8-bit bytes and transmitted one bit at a time by a single wire. This helps keep costs down and control wiring single communications protocol. Of course, compensation is that the transmission of 8 bits in series instead of in parallel, is eight times slower! (Remember that the parallel ports were developed after the serial ports.
How do serial communications really? However, despite the mentioned series of 8-bit transfer in the cable, in fact control bits are also transmitted. A bit of "home" to indicate data is coming, a 'stop' bit to indicate data over, and a parity bit (optional).Read More
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