Best Female-Female Serial Adapters of 2026

The JSAUX DisplayPort HDMI Adapter lets you easily connect your DisplayPort-enabled device to an HDMI display with stunning clarity. It supports up to 4K resolution at 30Hz, providing sharp and vibrant visuals for your monitor or TV. If you want smoother motion at lower resolutions, it also supports 2K at 60Hz and 1080p at 120Hz, perfect for gaming or video playback. You won’t need any drivers or software to get started—just plug it in and go, making setup quick and hassle-free. Plus, the adapter’s durable build with gold-plated connectors ensures long-lasting performance and reliable connections for your devices.

The DB9 Null Modem Male to Female Slimline Adapter 2 Pack converts standard straight wired cables to null modem wiring with pin 9 open. Its slimline design reduces leverage strain on computer ports, while the UL grade 94V-0 connector insulator satisfies flammability requirements. Additionally, the screws are removable and reversible for easy installation and flexibility.

The OIKWAN USB Serial Adapter is designed to connect your serial DB9 devices, like modems or printers, to a USB port on your computer. It features a 9-pin female connector, ensuring compatibility with your devices. With its FTDI chipset, this adapter supports a wide range of operating systems, including Windows and Mac OS, making it versatile for various users. The plug-and-play functionality means you can easily start using it without additional power sources, as it draws power directly from your computer. This convenience allows you to streamline your connections quickly and efficiently.

The DTECH USB TTL Adapter is a handy tool that lets you connect devices with 3.3V UART signals directly to your computer’s USB port. With a genuine PL2303TA chip inside, it ensures stable and reliable data transfer across various devices. The 6-foot length gives you plenty of reach, making it easier to work without being tethered too close to your PC. Plus, it includes four output leads for transmit (Tx), receive (Rx), power (VCC), and ground (GND), giving you full access to your device’s serial communication. The adapter also features an adjustable EEPROM, so you can customize signal settings to fit your specific needs.

The CABLEMAX RS-232 Tester is a handy tool for anyone working with serial connections. It lets you quickly check if your COM port is working by showing signal activity with clear LED lights, so you can easily spot issues. This tester works with any standard 9-pin RS-232 serial port, making it versatile for different devices. You don’t need any extra power source, which means you can use it on the go or in places without easy access to power. Plus, it’s super simple to use—just plug it in and start testing right away, no setup or drivers needed.

The ANMBEST DB9 Breakout Connector is designed to provide a reliable and durable connection for your serial devices. Its copper-plated contacts ensure strong conductivity and long-lasting performance, so you won’t have to worry about poor connections. You’ll appreciate the easy setup since no soldering is needed, making wiring quick and hassle-free. The connector works with a wide range of serial equipment, from computers to industrial instruments, giving you great flexibility. Plus, it includes a cable pressing plate that keeps your wires securely in place, preventing accidental disconnections while you work.

The Arnorin DB9 Adapter is designed to convert standard straight wired cables into null modem wiring, making it easier for you to connect devices that require this specific setup. With its gold contact plating, you can expect reliable connections, even after multiple uses. The slimline design minimizes strain on your computer ports, protecting them from potential damage. Additionally, the UL grade 94V-0 connector insulator ensures safety by meeting flammability standards, giving you peace of mind while using it. This adapter is a smart choice for anyone needing efficient and secure data transfer.

The DTECH DB9 Adapter is a convenient, solderless solution for creating custom DB-9 RS232 connections. With clearly labeled signal pins on both sides of the PCB, you can quickly connect and troubleshoot your devices with ease. Its sturdy construction features pure copper joints and gold-plated contacts, ensuring reliable data communication. Additionally, the compact case is designed for versatility, accommodating various cable sizes and tail tubes, making it suitable for a wide range of applications such as CNC controllers, digital cameras, and more.

The DTECH USB TTL Adapter is a handy 6-foot cable that connects your devices using 5V UART signals directly to your laptop’s USB port. It features a genuine FT232RL chip, ensuring stable and reliable data transfers, which is great for smooth communication between your hardware and computer. The cable provides easy access to important connection points like Tx, Rx, RTS#, CTS#, VCC, and GND, making your setup versatile and straightforward. Plus, the included FTDI chip allows you to customize signal settings through its internal EEPROM, giving you more control over how your device communicates. This adapter is perfect for debugging, programming, or flashing firmware with ease.

The Arnorin DB9 Adapter is designed to convert standard cables to null modem wiring, making it easier for you to connect devices that require this specific configuration. With gold contact plating, you can expect reliable connections even after multiple uses, ensuring your data transfers are smooth and uninterrupted. Its slimline design minimizes strain on your computer ports, which helps to prolong their lifespan. Additionally, the UL grade 94V-0 connector insulator meets flammability safety standards, providing peace of mind during use. These features combine to offer a practical and durable solution for your serial connection needs.