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RS232 DB9 connectors Receives data serially from Pin No. 2 & Transmits data from Pin No.3.
parallel port if you want to know why go to it140 if you know what that is.
Serial ports transmit data one bit at a time, which is why they are becoming obsolete.
A serial port only allows a single bit of data through at a time. A parallel port allows multiple bits of data through at a time.
There are 16 bits in a port address, which gives a port range of 0 - 65535
The serial port is mostly used to connect Modems. However, there are many devices that can connect to the serial port. Some of these are, mouses, trackballs, scanners, Ham radio equipment, cash registers and many many more.
To test COM ports, you need a computer with a functioning serial port or a USB-to-serial adapter, appropriate software for communication (like terminal emulation software), and a loopback connector or a serial device to connect to the port. Additionally, you may require a null modem cable if you are testing communication between two devices. Ensure that the correct COM port settings (baud rate, data bits, parity, stop bits, and flow control) are configured in the software.
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Parallel ports are easy to program and faster compared to the serial ports. But main disadvantage is it needs more number of transmission lines. Because of this reason parallel ports are not used in long distance communications. Let us know the basic difference between working of parallel port and serial port. In serial ports, there will be two data lines: One transmission and one receive line. To send a data in serial port, it has to be sent one bit after another with some extra bits like start bit, stop bit and parity bit to detect errors. But in parallel port, all the 8 bits of a byte will be sent to the port at a time and a indication will be sent in another line. There will be some data lines, some control and some handshaking lines in parallel port. If three bytes of data 01000101 10011100 10110011 is to be sent to the port, parallel port communication is faster then serial port.
A port that handles more than one data bit at a time is a parallel port. The most common example is the printerport (LPT) found on most older computers. The port is designed to transmit and receive 8 bits at a time. Parallel ports are less common on modern computers as the USB port has now replaced it for the majority of applications.