UGREEN CR104 (20211) USB to DB9 RS-232 Adapter Cable - 1.5M

The UGREEN CR104 (20211) (often sold under similar CR104 model code for the USB-to-RS-232 adapter) is a USB-to-serial converter cable that lets you connect traditional RS-232 serial devices — such as modems, barcode scanners, CNC controllers, POS systems, label printers, industrial equipment, and other legacy hardware with a DB9 (9-pin) serial port — directly to a modern USB-equipped computer or laptop without needing an internal serial card. This adapter features a USB-A male connector on one end and a standard DB9 RS-232 male connector on the other, with a 1.5 meter (≈5 ft) cable length that gives you flexibility in setup without overcrowding your workspace. It integrates a Prolific PL2303 chipset that provides broad compatibility across many operating systems (Windows, macOS, Linux) and ensures stable data communication at speeds up to about 1 Mbps, which is typical for serial communications. The cable is plug-and-play once the correct drivers are installed (drivers are often needed on older systems), and its shielded design, tinned copper conductors, and nickel- or gold-plated connectors help reduce interference while delivering reliable signal transmission. Powered directly from the USB port, it doesn’t require an external power adapter, making it a simple and practical tool for engineers, technicians, or anyone needing to interface with RS-232 gear from modern computers.