DB9 Serial Connector Pinout Diagram - RS-232 Pin Assignment Guide #252125 (License: Personal Use)

This diagram illustrates the pinout of a standard DB9 (also known as DE-9) male D-subminiature connector, commonly used for RS-232 serial communication. Pins are numbered left to right on the top row (1-5) and left to right on the bottom row (6-9), with pin 5 typically serving as signal ground. The layout is critical for correct cable assembly and interfacing legacy devices like modems, industrial controllers, and embedded systems.

Used on technical documentation pages, electronics tutorials, hardware manuals, and repair guides where users need to verify or wire RS-232 connections; matches user intent for troubleshooting, prototyping, or reverse-engineering serial interfaces.