GPIB to USB in 16 Bit Dataformat

[awebs]

Do you support the 16 Bit Mode in your currently SW 2.1? I used your GPIB-USB-A to connect our Spectrum Analyzer (Rohde & Schwarz, FSP) with our Windows 98 Laptop. This works and could control the Spectrum Analyzer bei commands. But it was not possibel to control them with our Measurement-SW, because this SW needs a GPIB Interface in 16 Bit mode. I tried an older National Instruments SW (Version 1.6 and 1.7) to operate the GPIB-USB-A but it doesn't work. Can you help me to find a way to opertate the GPIB-USB-A in 16 Bit Mode?

[DiegoF]

Hi,

We don't have a 16-bit driver for the USB-GPIB interface. All USB-GPIB drivers use Win32. Check the following web page for the supported platforms:

http://www.ni.com/support/gpib/versions.htm#note9

In Windows there's a technique called "thunking" that allows you to mix 16-bit and 32-bit code. You'll have to implement the thunking code. To access 32-bit code from a 16-bit code, "flat thunking" is used. Here are some web sites I found on the web related to thunking:

http://support.microsoft.com/default.aspx?scid=KB;EN-US;Q125710&
http://www.mvps.org/vbvision/thunks.htm
http://www.global-shared.com/api/thunk.html

Hope this helps you.

Diego F.
National Instruments.