How To Serial Port.

How To Serial Port.

Without the serial and parallel ports of your computer, much of the work performed by the PC would never be seen by anyone
the person who was sitting in front of him. The serial port is the type workhorse among components
computer. Its concept is simple: one line for sending data, other for receiving and a few more to
regulate how data is being sent by the other two lines. Due to its simplicity, the serial port has been
used for the PC to communicate with almost every device imaginable - from the known modems and printers
until plotters and alarm systems.

The most common use is for the serial mouse or modem. The reason is that the serial port is not a very efficient
for data transfer. She can only send data serially - one bit of data at a time, like soldiers marching
in queue. However, this inefficiency for data transfer is acceptable to use the mouse, which transmits a quantity
so little data that the speed is not really crucial, and perfect with respect to modems because with technology
current telephone lines can not carry more than one signal at a time.

The serial port is commonly known as RS-232 port. This is a specification of the Electronic Industries
(Electronics Industries Association) for a pattern of how the connectors are used on a serial port. The problem is
this pattern is not always taken into consideration for peripheral manufacturers and even by the manufacturers of
computers. The fact of connectors, either 9 pins or 25 pins, are used as serial ports shows that even
we have a long way to go before establishing exactly what is an RS-232.

Source: Evolution of Computers