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USB to RS232/422/485 Converter - DB9, 4-Port

The USB to RS232, RS422/485 converter allows you to connect four non-USB RS232 or RS422/485 DB9 devices to your USB bus.


2 In Stock
Extended Double Diamond™ Warranty Available (3 Additional Year)

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Product Features

  • Use an external USB connection to get the extra COM ports you need.
  • Make serial connections easy by putting your peripherals on your PC's USB bus.
  • No more internal serial adapters. Keep your serial peripheral connections on your PC's exterior.
  • Data rates up to 460.8 kbps for RS-232 and 921 kbps for RS-422/RS-485.Plug-and-play.
  • Powered by the USB bus.
  • Plug-and-play.


  • Support USB version 1.1.
  • Powered by the USB bus.
  • Data rates up to 460.8 kbps for RS-232 and 921 kbps for RS-422/RS-485.
  • No I/O ports or IRQs required.
  • Windows® 98/Me/XP and Windows 2000 compatible.

    Why install an internal serial adapter to get extra COM ports when using an external USB connection makes more sense? Our USB Hub converts your serial devices to USB-adaptable peripherals without sacrificing serial connection speeds.

    The hub features high-speed UARTs with 128-byte FIFO transmit buffers and 384-byte FIFO receive buffers. With data rates of up to 921 kbps for RS-422/485 and 460 kbps for RS-232, this hub is among the fastest USB serial devices in the industry!

    It's also ideal for connecting devices in harsh environments where communication lines may be affected by noise and voltage spikes. Not only does the USB Hub give you industrial-quality serial connections, but it also supports automatic RS-485 data enable/disable and includes a DB9 connector that's backward-compatible with PCI and ISA RS-422 products.

    The USB Hub connects easily to peripheral serial devices in external plug-and-play fashion. Because tit's hot-swappable, you can install it without having to power down your PC.

    Each hub comes with all necessary drivers, utilities, and help files for quick setup in Windows 98, Windows Me, Windows 2000, and Windows XP operating systems. Simply load the included software drivers, then connect the hub to your USB port and a serial device (printer, bar-code scanner, etc.). The hub even autoconfigures itself, enabling hassle-free, seamless integration into your existing application.

    Choose from three models. You can configure each of the ports individually using internal DIP switches.

  • Tech Specs

    CE Approval Yes
    Communication Chip High-speed, USB-to-serial interface (128-byte FIFO transmit, 384-byte FIFO receive)
    Connectors Serial: (2), (4), or (8) DB9 M; USB: (1) Type B F
    Distance (Maximum) RS-232: 50 ft. (15.2 m); RS-422/RS-485: 4000 ft. (1219.2 m)
    Operating Environment Temperature: 32 to 158° F (0 to 70° C); Humidity: 10 to 90% noncondensing
    Power From the USB bus (as long as the device is connected directly to a powered PC or hub)
    Speed RS-232: 460.8 kbps; RS-422/RS-485: 921 kbps
    Product Includes:
  • CD that includes user's manual plus software for setup in Windows 98, Windows Me, Windows 2000, and Windows XP
  • (1) 6-ft. (1.8-m) USB cable

  • * Technical specification weight is the unit weight. It is not the packaged shipping weight. For shipping weight, please contact Black Box customer service at 877-877-2269.



    Double Diamond Warranty

    Extended 1 Year Warranty Available

    Protect your purchase with an additional 1 Year Double Diamond™ warranty!
    Cost: $50.00

    Extended 3 Years Warranty Available

    Protect your purchase with an additional 3 Years Double Diamond™ warranty!
    Cost: $99.99


    Double Diamond™ Warranty (Standard)

    Take the risk out of equipment purchases with the Double Diamond™ Warranty from Black Box Network Services.

    The Double Diamond Warranty is our warranty that protects your Black Box® brand products* from accidental damage, including drops, water, and power surges.

    The 4-Port USB to RS232/422/485 Converter DB9 comes with a standard 5 Year Double Diamond™ Warranty (Standard) already included.

    During the warranty period, Black Box Network Services will repair or replace your damaged equipment within one week of receipt at NO CHARGE!*

    Plus, get an Extended Double Diamond Warranty.

    You can also extend your warranty or protect a previously purchased Black Box® brand product** for an additional year—for only 10% of the purchase price! Or, extend your coverage for a full three years for only 20% of the purchase price!

    Ordering an extended warranty is easy: When viewing a product in your shopping cart, just select the one or three years of additional coverage in the dropdown menu under “Warranty Options.” For details, contact Customer Service at 724-746-5500.

    * Warranty subject to certain exclusions and limitations ** Certain products may not be eligible.

    What’s more, we also have a 45-day return policy. Simply call Customer Service for a Return Authorization (RA) number, return your product in new condition and in the original package, and receive a full refund.