User manual

operations in LabVIEW. The VXI-DIO-128 and the

VXI-AO-48XDC do not require kernel mode access and are

completely functional without it.

7. How do I know that NI-DAQ has kernel mode access?

If you attempt an operation on a VXI-DAQ module that requires

NI-DAQ to communicate with your module at interrupt time, such as

buffered waveform capture, and NI-DAQ does not have kernel mode

access to the module, your application will receive the

deviceSupportError. See Question 6 for more information.

8. Is there anything I can do about a kernel mode access problem?

One way to solve a kernel mode access problem is to use onboard

memory on the VXI-MIO module. Timed, buffered analog input

(waveform capture) without kernel mode access is possible only if

you have onboard memory.

Timed, buffered analog output (waveform generation) is possible

even when kernel mode access is denied. However, the iteration

count will be unavailable and the regeneration modes are

unsupported. You can use either host or onboard memory for your

waveform generation, even when NI-DAQ does not have kernel

mode access.

Timed, buffered counter/timer input is not available without kernel

mode access.

Only one operation at a time can use onboard memory. That is, you

can acquire analog input data into the onboard memory, but you

cannot simultaneously generate a waveform from data in that

onboard memory. The VXI-MIO Series modules support onboard

memory only in LabVIEW and LabWindows/CVI. See Question 9

for more information about onboard memory.

9. How do I specify the use of onboard memory in my program?

The VXI-MIO Series modules support onboard memory only in

LabVIEW and LabWindows/CVI. First, you must tell NI-DAQ via

the NI-DAQ Configuration Utility that you have installed onboard

memory. See the Installation chapter of your VXI-DAQ device user

manual for more information. The onboard memory is on the

VXI-DAQ module itself, not on the VXIbus controller.

Select the amount of onboard memory you intend to use via the VXI

onboard memory field in the NI-DAQ Configuration Utility. Select

A32 address space for your module if your controller allows it. After