Measurement Computing UL for NI LabVIEW - Manual (Page 90)

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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