The 9 pin DB9 connector serial port on a PC is commonly referred to as which standard?

The 9 pin DB9 connector serial port on a PC is commonly known as the RS232 standard. RS232 is a standard for serial communication that defines the electrical characteristics and timing of signals. It is widely used for connecting computer systems to peripheral devices such as modems, printers, and other communication equipment.

The RS232 standard utilizes the DB9 connector to provide a reliable and effective means of serial data transmission, which operates at various baud rates. This standard specifies the voltage levels, pin configurations, and protocol for data exchange, making it a fundamental aspect of electronic communication in many applications.

The other standards depicted in the choices do not utilize the DB9 connector for their communication interface. USB is a more modern standard for connecting peripherals that supports higher speeds and additional features. RS442 is a balanced serial communication standard that is less common and generally designed for longer distances. IEEE 488, also known as GPIB (General Purpose Interface Bus), is used primarily in laboratory instruments and does not relate to the standard pin configuration associated with RS232.