USB to RS-232 4-Port DB9 Serial Adapter/Converter Multi-4/USB RS232

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  • Regular price $149.00
  • 2 available

The SystemBase Multi-4/USB RS232 lets you easily and quickly add additional serial ports to your system through the USB port. The Multi-4/USB delivers maximum performance up to 921.6Kbps. Combine that with the need for fewer components and you get cost-effective and reliable connections to your serial devices.

The USB to Serial Multi-4 supports most Windows and Linux operating systems and includes 15,000 volt surge suppression, eliminating blown ports. The Multi-4/USB includes a 4 port panel with a DB9 connector and is available in two models, RS232 and RS422/RS485. Simply plug in the USB connector and you have a COM port to connect modems, printers, bar-code scanners, or any other serial devices.


  • Latching USB to 4 ports Serial (male) Adapter/Converter
  • RS232 Interface
  • Supports USB Rev. 2.0
  • Communication speed: Up to 921.6kbps
  • Display communication status via TX/RX LED
  • ±15kV Surge protection

Connector Panel

The Multi-4/USB plugs into the USB port on your system. The connector panel has four DB9 male connectors and is available with support for either RS232 or RS422/RS485. LEDs next to the connector provide visual communication status of the ports. No additional power supply is required.

Supports USB Specification Revision 2.0

The Multi-4/USB supports revision 2.0 and is compatible with revision 1.1

15KV Surge Protection – Built-in

Don’t risk blown ports and downtime. The Multi-4/USB has built-in 15,000-volt surge suppression to protect against electrical spikes and blown ports giving you more reliable communications.


Interface Type

  • USB Specification Rev. 2.0, Full-Speed


  • Interface: RS232
  • Number of ports: 4 DB9
  • Maximum Speed: 921.6 kbps
  • RS-232 Signal Lines: TXD, RXD, GND, RTS, CTS, DTR, DSR, DCD, RI
  • Surge Protection: 15KV
  • Flow Control: RTS/CTS, XON/XOFF


  • Controller: FT4232H
  • Connector: DE-09P (DB-9 Male)
  • Dimensions (W x L x H): 39 x 184.15 x 16.3 mm (1.54 x 7.25 x 0.64 inches)


  • Supported OS:
    • Windows 7/8/8.1/10
    • Windows Server 2008/2012
    • Linux
  • Utility: TestView

Operating Environment

  • Operating Temperature: -20 ~ 70 °C
  • Storing Temperature: -20 ~ 70 °C
  • Humidity: 5 ~ 95% Non-Condensing


  • Certifications KC, FCC, CE

Package Includes:

1X Multi-4/USB RS232,
Download Guide, Warranty Policy

Additional Resources:

Multi-4/USB RS232 USB to RS-232 4-Port DB9 Serial Adapter/Converter Manual, Utilities and Specifications Downloads (SystemBase Website)