UPort 1250

2-port RS-232/422/485 USB-to-serial converters

Product Features

  • Hi-Speed USB 2.0 for up to 480 Mbps USB transmission
  • Drivers provided for Windows, WinCE, and Linux
  • LEDs for easy monitoring
  • 921.6 kbps maximum baudrate for super fast data transmission
  • Locking power jack
  • 128-byte FIFO and on-chip H/W, S/W flow control
  • 15N high retention type B connector
  • Supports fixed-base COM Utility for setting the initial extended COM port number

The UPort® 1250/1250I USB-to-serial converters allow you to connect 2 RS-232/422/485 devices to your laptop or workstation through the USB (Universal Serial Bus) port. These plug & play USB solutions are perfect for mobile, instrumentation, and point-of sale applications.


  • UPort 1250/1250I Datasheet


  • UPort 1200/1400/1600 Quick Installation Guide
  • UPort 1200/1400/1600 User Manual

Technical Notes

  • The_Secrets_of_RS-485_Half_Duplex_Communication
  • The_Secrets_of_UART_FIFO
  • The_Secrets_of_Flow_Control_in_Serial_Communication

Ordering info

Available Models

Model No.Model Description
UPort 1250USB to 2-port RS-232/422/485 Serial Hub
UPort 1250IUSB to 2-port RS-232/422/485 Serial Hub with 2 KV Isolation Protection

Optional Accessories

Model No.Model Description
DK35ADIN-Rail Mounting Kit (35 mm)
Mini DB9F-to-TBDB9 Female to Terminal Block connector
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