The pinout diagram of DE-9 port is shown below. Some of the applications of DE-9 port are serial interface with mouse, keyboard, modem, uninterruptible power supplies (UPS) and other external RS-232 compatible devices. A DE-9 port is also called as a COM port and allows full duplex serial communication between the computer and it’s peripheral. It is a D-sub connector with E shell and is often miscalled as DB-9. Hence, DE-9 was developed for RS-232 based serial communication while DB-25 was rarely used as a serial port and often used as a parallel printer port as a replacement of the Centronics Parallel 36 pin connector.ĭE-9 is the main port for RS-232 serial communication. They were developed as the main port for serial connections using RS-232 protocol but most of the applications did not require all the pins. DB-25ĭB-25 is a variant of D-sub connector and is the original port for RS-232 serial communication. There are two types of serial ports that are commonly found on a computer: DB-25 and DE-9. Serial PortĮven though the communication in PS/2 and USB is serial, technically, the term Serial Port is used to refer the interface that is compliant to RS-232 standard. PS/2 port is now considered a legacy port as USB port has superseded it and very few of the modern motherboards include it as a legacy port. The pin out diagram of a PS/2 female connector is shown below.Įven though the pinout of both mouse and keyboard PS/2 ports are same, computers do not recognize the devise when connected to wrong port. PS/2 connectors are color coded as purple for keyboard and green for mouse. It was introduced with IBM’s Personal Systems/2 series of computers and hence the name PS/2 connector. PS/2 connector is developed by IBM for connecting mouse and keyboard.
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