User manual

making these changes in the NI-DAQ Configuration Utility, reset or

power cycle your VXIbus chassis, and run

RESMAN.

Next, set your LabVIEW application to use onboard memory at run

time. For analog input, set the allocation mode control in the

AI Config VI to 3; allocate DSP Memory. For analog output, set the

allocate mode control in AO Config VI to 4; allocate

DSP Memory. Ignore the text referring to DSP Memory and the

AT-DSP2200 module.

Under LabWindows/CVI, the VXI-MIO series modules support

onboard memory only when using the Easy I/O for DAQ library. To

use the onboard memory, open the

Set Device Information

function, which is located in the Initialization/Utilities section of the

Data Acquisition Library. Specify the Select VXI-MIO Memory

Allocation Mode choice for the Type of Information field. Select

the desired memory allocation mode from the choices available in

the Information Value field. For example, to use onboard memory

for waveform capture, select the Use Onboard Memory for

VXI-MIO AI option. Note that these settings apply on a per-module

basis.

A constraint is placed on analog input operations that use onboard

memory when kernel mode access is denied—you cannot acquire

more data than the buffer that you allocated in the onboard memory

can hold. For example, if your buffer is 1,000 scans in size, you can

acquire no more than 1,000 scans. Continuous acquisition is not

allowed under these conditions.

Note:

You will be unable to utilize a buffer as large as the memory that you

installed because 6 KB of this memory is reserved and unavailable for

your use.

10. What exactly does the VXI-DAQ configuration file (

VXIDAQ.CFG,

VDAQ860.CFG, VDAQ850.CFG, VDAQ740.CFG

)

do to my

VXIEDIT

configuration?

For all controllers, the VXI-DAQ configuration file sets your

controller address space to A32, sets the Byte Order to

Non-Swapped, and sets Slave Write Posting to Enable. The

PCI-MXI-2 VXI-DAQ configuration file will also point retries

caused by CPU-MXI collisions towards the MXIbus, and set

MXI Auto Retry to disable. The VXIpc-700 Series VXI-DAQ

configuration file will point retries caused by CPU-VXI collisions

toward the VXIbus and set VXI Auto Retry to Disable.