niSwitch_init very slow on new Windows 7 PC

I have 4 SCXI-1127 cards connected to an SCXI-100 chassis with a USB interface.

I am using VBA in Excel.

On our old PC XP, the niSwitch_init command would run in 1-2 seconds per card.

On the new windows 7 PC, this command takes about 8-10 seconds per card. Alternatively, about 30-40 seconds for the 4 cards.

the exact commands that I use are:

status = niSwitch_init ("SC1MOD1", VI_TRUE,
VI_TRUE, card1)

status =
niSwitch_init ("SC1MOD2", VI_TRUE, VI_TRUE, map 2)

status =
niSwitch_init ("SC1MOD3", VI_TRUE, VI_TRUE, card3)

status =
niSwitch_init ("SC1MOD4", VI_TRUE, VI_TRUE, 4)

If something has changed in the version of Windows 7 niSwitch?

What could be causing it?

The following commands to the switch are running at the same time as before. It's onlt the command niSwitch_init which is slow.

Thank you

Hello Phil,

Thank you for your response. The KB shows OR-Switch 4.2 (and later versions) because the problem will be resolved with the release of these drivers. However, the OR-Switch 4.2 official release date has not announced yet. At this point, the best work around workaround would be to enable the HPET on your Windows 7 system.

Best regards

M Ali

Technical sales engineer

National Instruments

www.NI.com/support

Tags: NI Products

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