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Universal Library Virtual Instruments (VIs) Memory board VIs

MemRead.VI

Reads data from a memory board into an array.

Summary:

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

be 0 to 100.

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

Count [U32] - Number of samples (words) to read

Outputs:

DataBuffer [U16] - Output data array.

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

Arguments:

BoardNum The memory board number associated with a board when it was installed with

InstaCal.

FirstPoint Use the FirstPoint argument to specify the first point to be read. For example, to

read points #200 - #250, set

FirstPoint=200 and Count=50.

To read a large amount of data from the board in small portions, set

FirstPoint to

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

operation of MemRead VI when working with large amounts of data.

Count Number of samples (words) to read.

DataBuffer Data read from memory board.

ErrCode Error code returned 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 MemRead.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 cannot call MemRead.VI 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 Manuale Utente Pagina 90