DB9 Female and Male Connector in One Breakout Board Function and compatibility One end is a DB9 male connector and the other end is a DB9 female connector, enabling a DB9 female connection to be converted to a DB9 male connection for serial applications. Durable construction Allcopper base with goldplated joints on a thickened FR4 fiberglass PCB board. This design provides reliable contact, helps resist oxidation, and supports a long service life. Wide range of applications Connects various serial devices. Examples include automatic control equipment, industrial control equipment, cash registers, computers and tax control machines, digital cameras, PLCs, PDAs, MODEMs, set boxes, barcode scanners, industrial instrumentation, and other equipment that communicates via RS232. Flexible and easy to use Terminal block design is easier than soldering wires to a connector. Suitable for test purposes, checking pinouts, cables, or any devices with an RS232 interface. Use scenarios Lab bench testing: quickly test RS232 cables and pinouts without soldering. System integration: connect legacy serial devices (cash registers, PLCs, barcode scanners) to modern PCs or controllers. Field service: diagnose and maintain industrial equipment with a quick RS232 bridge, avoiding direct soldering on connectors.