A computer desires extra additive for interacting with human users and other computers. Different devices like mouse, keyboard, monitor or display unit, printer, speaker, flash drive, etc., communicate through a computer port. A port is an interface or a connection point for the computer and the devices. Thus, being known as a communication port.

The primary characteristic of a PC port is to behave as a factor of attachment, where the cable from the peripheral can be plugged in and lets the data move from and to the device.

In computers, these ports can be divided into kinds - Serial Ports and Parallel Ports, primarily based on the kind of protocol used for conversation.

A serial port is an interface via which peripherals can be connected using a serial protocol which involves the transmission of data one bit at a time over a single exchange line. For example, D-Subminiature or a D-sub connector that deliver RS-232 signals.

Whereas a parallel port is an interface through which the conversation among a PC and its peripheral device is in a parallel manner i.e. data is transferred in or out in parallel using multiple conversation lines. The printer port is an instance of a parallel port.

Today, we discuss some of the common keyboard and mouse interfaces in this blog:


PS/2 connector is developed with the aid of IBM to connect mouse and keyboard with the PC. It was launched with IBM’s Personal Systems/2 collection of computers and as a result, it is called PS/2 connector. PS/2 connectors are coloration coded as purple for keyboard and green for the mouse.

PS/2 is a 6-pin DIN connector. Even though the pinout of each mouse and keyboard PS/2 ports are equal, computers cannot apprehend the device while connected to the wrong port.

PS/2 port is a legacy port as USB port has outmoded it and only a few of the current motherboards include it as a legacy port. It is a parallel port type.


DB-25 is a version of D-sub connector and is the first port for RS-232 serial communique. They have been evolved as the main port for serial connections using RS-232 protocol but the maximum of the equipment did not require all of the pins.

Thus, based on serial communication, DE-9 was created for RS-232 and DB-25 was seldom used as a serial port and regularly used as a parallel printer port as a substitute of the Centronics Parallel 36 pin connector.

DE-9 or RS-232 or COM Port:

DE-9 is the principal port for RS-232 serial communication. it is a D-sub connector with E shell and is often miscalled as DB-9. A DE-9 port is also known as a COM port and allows complete duplex serial communication among the computer and it’s peripheral.

A number of the packages of DE-9 port is serial interface with a mouse, keyboard, modem, uninterruptible strength supplies (UPS) and different external RS-232 well-matched devices.

The DE-9 and DB-25 ports have now been replaced with USB slots or other types.

Parallel Port or Centronics 36 Pin Port:

A parallel port is an interface among computer and peripheral gadgets like printers with parallel communication. The Centronics port is a 36-pin port that is advanced as an interface for printers and scanners and as an end result, a parallel port is likewise referred to as Centronics port.

As the technology evolves, many such ports are used for communicating with the computer for different devices. And for every different port, you would need different kinds of cables. When it comes to the needs of cables, Connect Zone is your solution! We are not only cable manufacturers, but we are cable experts. Customize them as per your needs today by contacting ConnectZone.