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Step 2 - Download Your File(s)
The following is a list of our most popular downloads. If you need a file that is not on this list, please contact Keyspan Support Department.

Software / Drivers
#OSKeyspan Part Name
Keyspan Part Number
Keyspan Version NumberNotes
09WindowsUSB Serial Adapter
USA-19W
USA-19QW
3.1For Windows 98/Me/2000/XP
Only works with USA-19W and USA-19QW
18Mac OS X
Universal Binary
USB Serial Adapter Drivers
All Part Numbers
USA-28
USA-28X
USA-28X A
USA-28X B
USA-28XG
USA-19
USA-19X
USA-19Qi
USA-19W
USA-19QW
USA-19HS
USA-49W
USA-49WLC
USA-49WG
UPR-112
USA-18X
2.5For Mac OS X 10.2.8 - 10.4.x
for ALL Keyspan USB to Serial Adapters
Universal Binary
31Mac OS
8.6 - 9.2.2
USB Serial Adapter
USA-19W
USA-19QW
1.8.6For USA-19W, USA-19QW
NOTE:
This software is only compatible with Keyspan part numbers USA-19W and USA-19QW. Other models are not supported by this software


Documentation / User Manuals
OSDescriptionKeyspan Version NumberNotes
Mac OS XUSB Serial Adapter
Mac OS X User Manual
2.0PDF File
User Manual covers all models of USB to Serial Adapter


Developer Downloads and Links
OSDescriptionNotes
Mac OS XMacOSX Sample Code

ZIP file | .c file
Sample Code
This sample code shows you how to use IOKit to find serial ports on MacOSX and use POSIX calls to talk to those serial ports.
Mac OS
8.6 - 9.2.2
Apple's Technote 1119:
Serial Port Apocrypha


Link | PDF file
Link to Sample Code (on Apple's website)
This tech note on Apple's developer's site covers the major topics related to serial port programming. This page also includes sample code for finding, opening, closing, and yielding serial ports under the classic serial API and the Open Transport serial API.
VariousCreating REM files

01 Creating REM Files PDF
02 REM File Tips PDF
PDFs covering the creatation of REM files. Please read both files. This information is provided for historical reference.
WindowsWindows Sample Code and White Paper

PDF file | HTML version
Sample Code and White Paper
This sample code and white discusses programming of USB to serial ports. It also includes sample code.
LinuxLinux InformationLinux
Info and files for Linux users..
SunSun InformationSun Solaris
Info and files for Sparc/Solaris users.