National Instruments 321645c-01 用户手册
Chapter 2
Function Reference — SCAN_Op
NI-DAQ FRM for PC Compatibles
2-296
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National Instruments Corporation
SCAN_Op
Format
status = SCAN_Op (deviceNumber, numChans, chans, gains, buffer, count, sampleRate,
scanRate)
Purpose
Performs a synchronous, multiple-channel scanned data acquisition operation.
SCAN_Op
does
not return until NI-DAQ has acquired all the data or an acquisition error has occurred (MIO,
AI, and DSA devices only).
AI, and DSA devices only).
Parameters
Input
Output
Parameter Discussion
numChans is the number of channels listed in the scan sequence.
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 n for PCI-6110E, PCI-6111E, and DSA devices where n is the number
of physical channels onboard.
1 through 512 for the E Series devices, AT-MIO-16F-5, AT-MIO-64F-5, and
AT-MIO-16X.
1 through n for PCI-6110E, PCI-6111E, and DSA devices where n is the number
of physical channels onboard.
Name
Type
Description
deviceNumber
i16
assigned by configuration utility
numChans
i16
number of channels
chans
[i16]
list of channels
gains
[i16]
list of gain settings
count
u32
number of samples
sampleRate
f64
desired sample rate in pts/s
scanRate
f64
desired scan rate in scans/s
Name
Type
Description
buffer
[i16]
contains the acquired data