USB to RS-422/485 2-Port DB9 Serial Adapter/Converter Systembase Multi-2/USB Combo

  • Sale
  • Regular price $92.50
  • 3 available

The SystemBase Multi-2/USB Combo lets you easily and quickly add additional RS-422/RS-485 serial ports to your system through the USB port. The Multi-2/USB delivers maximum performance up to 921.6Kbps. Combine that with the need for fewer components for cost-effective and reliable connections to your serial devices. The USB to Serial Multi-2 supports support most Windows and Linux operating systems and includes 15,000-volt surge suppression, eliminating blown ports. The Multi-2/USB includes a 2 port panel with DB9 connectors. Simply plug in the USB connector and you have a COM port to connect modems, printers, bar-code scanners, or other serial devices.


  • USB to 2 port DB9 Serial (male) Adapter/Converter
  • RS422 / RS485 Interface
  • Latches onto the USB Connector to prevent accidental detachment
  • Supports USB Rev. 2.0 (Full speed)
  • Communication Speed: Up to 921.6kbps
  • Display communication status via TX/RX LED
  • ±15kV Surge protection
  • Auto Togging: Automatic control of BUS I/O for RS422/RS485
  • Slew-Rate limit control

Connector Panel

The Multi-2/USB plugs into the USB port on your system. The connector panel has two DB9 male connectors and is available with support for either RS232 or RS422/RS485. LEDs next to the connector provide a visual communication status of the ports. No additional power supply is required.

Supports USB Specification Revision 2.0

The Multi-2/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-1/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: RS422/RS485(Combo)
  • Number of ports: 2 DB9
  • Maximum Speed: 921.6 kbps
  • Signal Lines: 
    • RS422: TXD+, TXD-, RXD+, RXD-
    • RS485: TRXD+, TRXD-
  • Surge Protection: 15KV
  • Flow Control: XON/XOFF
  • Data Crash Prevention: Auto-toggling


  • Controller: FT232R
  • Connector: DE-09P (DB-9 Male)
  • Dimensions (W x L x H): 39 x 94 x 16.3 mm (1.54 x 3.7 x 0.64 inches)
  • Weight: 60g / 2.12oz


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

Operating Environment

  • Operating Temperature: 0 ~ 50 °C
  • Storing Temperature: -20 ~ 80 °C
  • Humidity: 5 ~ 90% Non-Condensing


  • Certifications KC, FCC, CE

Package Includes:

1X Multi-2/USB COMBO,
Download Guide, Warranty Policy

Additional Resources:

Multi-2/USB Combo USB to RS-422/RS-485 2-Port DB9 Serial Adapter/Converter Manual, Utilities and Specifications Downloads (SystemBase Website)