Measurement-computing UL for NI LabVIEW Manuel d'utilisateur télécharger pdf (Page 93)

Universal Library Virtual Instruments (VIs) Memory board VIs

MemWrite.VI

Writes data from an array to the memory card.

Summary:

Inputs: BoardNum [U32] - The board number assigned when installed with InstaCal. Can

be 0 to 100.

DataBuffer [U16] - Pointer to the data array.

FirstPoint [I32] - Index of first point to write or FROMHERE.

Count [I32] - Number of samples (words) to write.

Output:

ErrCode [I32] - Error code. See ErrMsg.VI

Arguments:

BoardNum The board number associated with a board when it was installed with InstaCal.

DataBuffer Buffer containing data to be written to the external memory board.

FirstPoint Use the FirstPoint argument to specify where in the board's memory to write the

first point. For example, to write to locations #200 - #250, set

FirstPoint=200 and

Count=50.

To write a large amount of data to the board in small portions, set

FirstPoint to

FROMHERE (-1) to write each successive portion. Using FROMHERE (-1) speeds up the

operation of MemWrite when working with large amounts of data.

Count Specifies the number of words to be written to the external memory card. Count

must be equal to or less than the size of

DataBuffer.

ErrCode Error code from the Universal Library. Zero if no error occurred. Use the ErrMsg

VI to convert

ErrCode into a readable string.

Notes:

DT Connect conflicts - The MemWrite VI can not be called while a DT Connect transfer is in progress. For

example, if you start collecting A/D data to the memory board in the background (by calling AInScBg.VI or

AInScFg.VI with the

DTCONNECT + BACKGROUND options). You can not call MemWrite until the AInScBg.VI or

AInScFg.VI has completed. If you do you will get a

DTACTIVE error.

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Measurement-computing UL for NI LabVIEW Manuel d'utilisateur Page 93