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Chapter 10 Easy I/O for DAQ Library
© National Instruments Corporation 10-9 LabWindows/CVI Standard Libraries
Parameters
Input
device
short integer Assigned by configuration utility.
channelString
string Analog input channels that are to be sampled.
numberOfScans
long integer Number of scans to be acquired complete. One
scan involves sampling every channel in the
channelString once.
scansPerSecond
double Number of scans performed per second. Any
particular channel to be scanned at this rate.
highLimitVolts
double Maximum voltage to be measured.
lowLimitVolts
double Minimum voltage to be measured.
triggerType
unsigned
short integer
The trigger type.
edgeSlope
unsigned
short integer
The edge/slope condition for triggering.
triggerLevelV
double Voltage at which the trigger is to occur.
triggerSource
string Specifies which channel is the trigger source.
pretriggerScans
long integer Specifies the number of scans to retrieve before
the trigger point.
timeLimitsec
double The maximum length of time in seconds to wait
for the data.
fillMode
short integer Specifies whether the waveforms array are in
GROUP_BY_CHANNEL or GROUP_BY_SCAN
mode.
Output
actualScanRate
double The actual scan rate. The actual scan rate may
differ slightly from the scan rate you specified,
given the limitations of your particular DAQ
device.
waveforms
double array Array containing the voltages acquired on the
channels specified in the channelString.
Return Value
error
short integer Refer to error codes in Table 10-5.