Best RJ45 Serial Adapters of 2026

The DTECH DB9 RJ45 Adapter is a simple and cost-effective solution that allows you to connect RS232 COM port devices using affordable CAT5 or CAT6 Ethernet cables. This adapter converts a DB9 male connector into an RJ45 female connector, making it easy to link your serial devices without complex wiring. You can also extend your serial signals up to 65 feet by using a pair of these adapters as socket couplers, giving you greater flexibility in your setup. The bi-directional design with thumbscrews ensures a secure and hassle-free connection every time.

The SHANFEILU RS232 Adapter is designed to extend your RS232 serial data connection up to 65 feet using CAT5, CAT5e, or CAT6 cables, making it ideal for longer distance setups. It must be used in pairs, with one DB9 male and one DB9 female adapter, ensuring reliable bidirectional communication between devices. Compatible with a wide range of 9-pin RS232 devices such as computers, monitors, and barcode printers, this adapter offers great versatility. Its robust design includes moulded strain relief connectors and finger-tightened screws, providing a secure and durable connection with ease of use.

The USR-TCP232-302 Adapter is a low-cost serial device server that allows you to easily connect RS232 devices to an Ethernet network. It supports bidirectional transparent transmission, meaning your data can flow seamlessly between serial and networked devices. With flexible baud rates from 600 bps to 230.4 Kbps, you can adjust communication speed to suit your needs. The adapter offers multiple work modes such as TCP Server, TCP Client, UDP Client, and UDP Server, giving you versatile options for network communication. Additionally, you can upgrade its firmware and configure settings conveniently through a web interface.

The ZUYOK DB9 Extender is a versatile adapter that allows for bidirectional conversion of TCP/IP network interfaces. By enabling the transmission of RS232 signals over CAT5E or CAT6 cables, it simplifies your setup and saves costs compared to traditional DB9 cables. You will find it convenient as it requires no external power and is easy to use within a distance of 1-15 metres. With a plug-and-play design, you can quickly connect your devices without the hassle of complicated installations.

The GINTOOYUN DB9 Adapter allows you to connect devices using a TCP/IP network interface with serial capabilities. This means you can transfer both serial and network data seamlessly. Its high-quality alloy joint ensures excellent contact and fast signal transmission, enhancing your data transfer experience. With its plug-and-play design, there's no need for driver installation, making it incredibly convenient for you. Additionally, its compatibility with standard DB9 devices means you can use it with various equipment effortlessly.

The DTech Serial Adapter is a practical solution for connecting RS232 COM port devices using standard Cat5 or Cat6 RJ45 network cables. This modular adapter simplifies data communication by converting a DB9 connector to an RJ45 connector, making it easy to connect to various devices. With the ability to extend RS232 serial signals up to 65 feet, you can easily position your devices where needed. Additionally, the bi-directional design and thumbscrews ensure a secure connection, giving you peace of mind while using your equipment.

The Waveshare RS485 Ethernet Converter offers bi-directional transparent data transmission between RS485 and Ethernet, making it essential for seamless connectivity. Its rail-mount support allows you to easily combine multiple serial servers, providing a flexible setup for your needs. With Modbus gateway support, you can efficiently upgrade your Modbus system using 3D configuration software. Additionally, the product supports multiple communication modes, including TCP Server, TCP Client, and UDP, ensuring versatile options for your network setup.

The Waveshare UART Ethernet Converter enables seamless bi-directional data transmission between UART and Ethernet for devices like Raspberry Pi, Arduino, and STM32. It features a full-duplex/half-duplex Ethernet interface, allowing for reliable communication. With 2-CH UART concurrent operation, you can transmit data independently on each channel, enhancing your project flexibility. Furthermore, it supports automatic cable detection and switching, ensuring a hassle-free setup. The convenience of DHCP auto-obtained IP adds to its user-friendly nature, making networking simpler for you.