USB-A to RS-232 Cable UGREEN 20210B, 1 m, Black

UGREEN USB-A to RS-232 Cable 20210B is a 1 m black interface cable designed to connect devices with an RS-232 serial port to a computer or host with a USB-A port. The cable provides a direct wired link for serial communication and data transfer, enabling configuration and operation of legacy equipment and peripherals that still rely on RS-232 connections. The compact design and single-cable solution remove the need for separate adapters and simplify wiring when integrating modems, routers, industrial controllers, POS terminals and other serial devices with modern systems.

Advantages

This USB-A to RS-232 cable offers plug-and-play connectivity with a sturdy molded connector housing and integrated electronics to handle signal conversion between USB and RS-232 levels. The 1 m length balances reach and cable management for desktop and rack environments while the black jacket provides discreet appearance and basic abrasion resistance. The cable reduces installation complexity compared to multi-component converter setups and supports reliable point-to-point serial communication for configuration, diagnostics and data exchange.

Suitable for

• Connecting legacy serial devices such as modems and barcode scanners to modern computers
• Interfacing industrial controllers, PLCs and instrumentation for configuration and monitoring
• Linking POS terminals, receipt printers and other retail equipment with RS-232 ports
• Serial console access for network equipment and embedded systems

Key specifications

• Cable type: USB-A to RS-232 serial cable
• Length: 1 meter
• Color: Black
• Connector on host side: USB Type-A (male)
• Connector on device side: DB9 RS-232 (male/female orientation per device compatibility)
• Function: Signal level conversion for serial communication (USB to RS-232)
• Typical uses: Data transfer, device configuration, serial console access

How to use

Connect the USB-A plug to an available USB port on your computer and attach the RS-232 connector to the serial port of the target device. If required by the operating system, install the driver supplied by the system or available from the device vendor; many modern systems detect and configure the cable automatically. After the connection is established, open the appropriate serial terminal or application, select the corresponding COM port and set the correct baud rate, parity, data bits and stop bits to match the connected device. Perform configuration, data transfer or diagnostics as needed.

Usage recommendations

For stable communication, verify serial port settings and use shielded USB ports when available. Keep cable length to the specified 1 m to avoid signal degradation, and route the cable away from high-voltage or strong RF sources. If you experience driver or connectivity issues, check device manager for COM port assignment and update drivers from the manufacturer.