The serial port is bidirectional, and usually known as a bidirectional port or a communications port.Ī serial connection was primarily used for signal exchange because of their bidirectional ability. Using the serial connection on the network, we can send and receive data bits sequentially over a single channel. The I/O address sends and receive packets to and from a peripheral device such as a mouse or keyboard or any network devices. Each COM position represents an input/output (I/O) and an interrupt request (IRQ) address. Usually serial port is a male port and system resource configurations are chosen for each port and are recognized by COM1, COM2, COM3, COM4, and so forth. The LAN-to-WAN connection over a serial interface is also known as leased line connection because the line is usually leased from the telephone companies and the subscribers pay for those lines to hold the continuous connection between two sites. The serial port is used for point-to-point connection such as LAN-to- WAN connection. The data transfer rate is very slow then the parallel port. Modern serial ports are used in scientific instruments such as cash registers and applications like industrial machinery systems. A serial interface is the oldest types of an interface that was also used to connect printers and external modems to a PC at that time. A serial port allows a PC or network devices to transmit or receive data one bit at a time.
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