Tripp Lite
1111 W. 35th Street
Chicago, IL 60609
+1 (773) 869-1776
+1 (773) 869-1329

USB Twin Serial Adapter for Macs Keyspan by Tripp Lite


There is good reason why we sell more Mac USB serial adapters than any other company. We've been making PCI serial cards and USB serial adapters for Mac OS for more than 10 years!

Our USB Twin Serial Adapter is recommended by dozens of serial device manufacturers and has been certified by Apple for use with Final Cut Pro.


  • Provides two RS-422 ports for connection to serial devices
  • Supports data rates up to 1 Mbps
  • Draws power from the USB connection -- a power adapter in not required
  • Has been qualified by Apple, Avid and others for connection to video decks
  • Supports use of multiple adapters on one Mac

System Requirements

  • An available USB port
  • Compatible with Mac OS 9.2 and later, Mac OS X 10.2.8 through 10.5.x (both 32- and 64-bit), and Mac OS X 10.6 (32-bit and 64-bit)

For use with RS-232 and RS-422 serial devices including modems, graphics tablets, video decks, serial PDAs, serial printers, GPS devices, and medical/scientific instrumentation. Does not support AppleTalk/Local Talk. Some serial devices, including many serial printers, do not have drivers for Mac OS X and therefore will not operate under Mac OS X. Check with the serial device manufacturer to confirm that Mac OS X is supported. (For Epson Stylus Printers, use our USB Parallel Printer Adapter if running Mac OS X.)

Package Includes

  • USA-28XG USB Twin Serial Adapter for Mac
  • CD with driver software and user guide
RoHS compliant


UPC Code672603040068
Product OverviewKeyspan-by-Tripp Lite USB Twin Serial Adapter
Shipping Dimensions (hwd / in.)9.30 x 5.80 x 2.80
Shipping Weight (lbs.)0.33
Side A - Connector 1USB A (MALE)
Side B - Connector 1MINI DIN-8 (FEMALE)
Product Warranty Period (Worldwide)2-year limited warranty

Questions & Answers

More Q&As may be available on the USA28XG model support page.

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Mon - Fri 8 AM - 5:30 PM CST
+1 (773) 869-1776

Mon - Fri: 8 AM - 5:30 PM CST
+1 (773) 869-1234

Tripp Lite
1111 West 35th Street
Chicago, Illinois 60609
United States

+1 (773) 869-1111 Main
1 773.869.1329 Fax

Business Hours
8 AM - 5:30 PM CST

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Need help with your purchase?
We're always available to help with questions, including product selection, sizing, installation and product customization. Call us at +1 (773) 869-1776 or email