The UGREEN USB to DB9 RS-232 Adapter Cable (CR104 / 20210) lets you easily connect modern computers to legacy serial devices. Featuring a USB-A to DB9 male (RS-232) interface and stable chipset, it supports up to 115200 bps for routers, switches, POS systems, scanners, modems, GPS units, and industrial equipment. Compatible with Windows, macOS, and Linux.
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Connect modern computers to legacy serial devices quickly and reliably. The UGREEN CR104 (model 20210) bridges a computer’s USB-A port to a DB9 male RS-232 interface—ideal for routers/switches (console), POS terminals, barcode scanners, modems, GPS units, industrial machinery, test instruments, and more.
| Brand | UGREEN |
| Series / Model | CR104 / 20210 |
| Function | USB to RS-232 serial adapter |
| USB Connector | USB-A male (USB 2.0, backward compatible with USB 1.1/3.x ports) |
| Serial Connector | DB9 male (RS-232, 9-pin) |
| Cable Length | 1 m, 1.5 m, 2 m, 3 m |
| Supported Signals | TXD, RXD, RTS, CTS, DTR, DSR, DCD, RI, GND (as required by device) |
| Baud Rate | Up to 115,200 bps (higher rates may depend on OS/driver/device) |
| Power | Bus-powered from USB port (no external power required) |
| OS Compatibility | Windows 7/8/10/11, macOS, Linux (driver support may be required on some systems) |
| Build | Molded connector shells; integrated strain relief |
| Operating Environment | Indoor, standard office/industrial bench use |
| Compliance | RoHS; USB-IF class compliant (chipset-dependent) |
| Color | Black |
| SKU / EAN | 20210 (CR104) |
| Warranty | Manufacturer’s limited warranty (terms vary by region) |
Disclaimer: Some specifications (e.g., maximum baud rate, signal line usage) vary with device, driver, and OS. For best results, use up-to-date drivers and avoid tight bends near connectors.
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