6533 (PCI DIO 32HS) bus transfer

[RobertC]

I have a VB/Measurement Studio application that collects data from 6533 in continuous mode (100kHz sample with internal clock) using progress interval to report new data to app. Have used this on several PCs from 600MHz to 1.8G with NT and Win2000 without trouble. Now gettint 10845 overflow errors with newer (faster) PCs PIII/IV and WinXP. Is it possible the card is setup as PCI bus master on older machines but cannot with newer "auto-config" machines. Thanks for any help!

[RamziH]

Hi,

The error you are getting is due to an onboard memory overflow. You can try some of the Visual Basic examples that ship with NI-DAQ and see if you are getting the same error. You can try reducing the input rate, and see if this is going to eliminate the error. I do not believe that the OS is the issue cause any system that supports DMA allows the PCI cards to become bus masters -- and this is supported in WinXP.

Regards,
RamziH.

[RobertC]

RamziH,

Thanks for your thoughts and ideas. I agree it is not OS related and in fact I did a new install of Win2K on one of the problem machines and the problem still occurs. It simply seems like the boards DMA gets held up for a moment and the error occurs. I have used application on so many previous "slower" machines this is baffling.