The parallel port is easier to interface in comparison to the serial port and in most of the cases any device that you connect to the serial port it will need to undergo serial transmission. Under this transmission system the serial port is converted back to the port of the parallel system and it can make work easier. The UART is the only process to accomplish this. According to the software side there are various users on a standard parallel port that you need to attain.
Do you know the advantages of using the method of serial data transfer instead of parallel one?
Usually parallel cable is shorter than serial cables. The serial port transmits 1 at -3 to -25 volts and 0 at +3 to +25 volts. On the other hand, parallel port transmits 1 as 5v and 0 as 0v. Therefore 50v is the maximum amount of swing that is possible by a serial port and in comparison to the parallel port it is 45 times more. There the problem of cable loss is not much in serial port as they are in parallel port.
As in case of parallel transmission, serial port installation does not require much wires. If also you learn to mount it at a far away distance from the computer then you can use the null modem configuration that is going to cost much less than the original wiring. This configuration usually requires 3 core cable and it is cheaper than using 25 or 19 core cable wires. The cost of interfacing at both the ends must be taken into consideration.
Recently, the use of microcontrollers has proven to be very useful and most of these are built in SCI future. This can be used to communicate with the outside world. On the other hand, serial communication reduces the count of pin of these MPU’s. Two pins are used commonly that includes receive data and transmit data.
Download Interfacing the Serial / RS232 Port ECE Lab Reference Material.