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Glam Fame Journal

What is a DB9 connector?

Author

Sophia Hammond

Updated on March 22, 2026

What is a DB9 connector?

The DB9 connector (originally named DE-9) is an analog socket, with 9 pins, from the D-Subminiatures (D-Sub) connector family. The DB9 connector is mainly used in serial ports, allowing asynchronous data transmission according to the RS-232 standard (RS-232C).

Is DB9 same as VGA?

VGA Monitor (DB15 & DB9) The VGA connector can use a classic DB9 connector or (more commonly today) a DB15 style connector. The VGA connector (15 pin) is still widely used and while it was originally used to carry a 640 x 480 pixel format it is used to carry a variety of geometries including HDTV formats.

Is DB9 the same as RS-232?

The term DB-9 really pertains to the connectors on the end of the cables and not the cables themselves. DB9, for example, is a 9 pin connector for a serial cable. You can see one here. RS-232, on the other hand, refers to the standard itself.

Are DB9 cables still used?

DB9 connectors were commonly used for serial peripheral devices like keyboards, mice, joysticks, etc. Also they are used on DB9 cable assemblies for data connectivity. Today, the DB9 has mostly been replaced by more modern interfaces such as USB, PS/2, Firewire, and others.

What cable is used for RS232?

DB9 cable
Keep in mind that RS232 is simply a form of serial communications, or a way to transmit data. A standard DB9 cable is probably the most used cable for this application.

Can you connect DB9 to VGA?

This DB9 Female to HD15 VGA Female Serial Adapter is used to change connector type. With this special adapter, you are able to connect a multi-sync HD15 VGA graphics card to a DB9 port without buying a new cable. All you need to do is plug this adapter in.

Can DB9 be used for a monitor?

In summary, no, a serial port is not a video port and there is no way to use a monitor of any kind with it (even a 9-pin monitor, let alone 15-pin one). Since it does not have onboard video, you will need to install a video-card.

What port has 9 pins?

DB9 Serial Ports
DB9 Serial Ports This 9-pin layout become a de facto hardware standard that enabled device manufacturers to create products that worked on a wide range of computer platforms.

What is the difference between RS-232 and serial?

RS-232 signals are similar to your microcontroller’s serial signals in that they transmit one bit at a time, at a specific baud rate, with or without parity and/or stop bits. The two differ solely at a hardware level. On most PCs these signals swing from -13 to +13V.

How many wires are in a DB9 cable?

The term “DB9” refers to a common connector type, one of the D-Subminiature or D-Sub types of connectors. DB9 has the smallest “footprint” of the D-Subminiature connectors, and houses 9 pins (for the male connector) or 9 holes (for the female connector).