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Chapter 2 Function Reference — SCAN_Demux
NI-DAQ FRM for PC Compatibles 2-294
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National Instruments Corporation
SCAN_Demux
Format
status = SCAN_Demux (buffer, count, numChans, numMuxBrds)
Purpose
Rearranges, or demultiplexes, data acquired by a SCAN operation into row-major order
(that is, each row of the array holding the data corresponds to a scanned channel) for easier
access by C applications.
SCAN_Demux
does not need to be called by BASIC applications to
rearrange two-dimensional arrays because these arrays are accessed in column-major order.
Parameters
Input
Input/Output
Parameter Discussion
buffer is an integer array of A/D conversion samples returned by a SCAN operation.
count is the integer length of buffer (that is, the number of samples contained in buffer).
numChans is the number of channels that NI-DAQ scanned when the data was created. If you
used SCXI to acquire the data, numChans should be the total number of channels sampled
during one scan. Otherwise, this parameter is the same as the value of numChans selected in
SCAN_Setup
,
Lab_ISCAN_Start
,
SCAN_Op
, or
Lab_ISCAN_Op
.
Range: 1 through 16.
1 through 512 for the E Series devices, AT-MIO-16F-5, AT-MIO-64F-5, and
AT-MIO-16X.
1 through the physical number of AI channels for PCI-6110E and PCI-6111E
(4 or 2).
Name Type Description
count u32 number of samples
numChans i16 number of channels that were scanned
numMuxBrds i16 number of AMUX-64T devices used
Name Type Description
buffer [i16] conversion samples returned