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Chapter 10 Easy I/O for DAQ Library
© National Instruments Corporation 10-19 LabWindows/CVI Standard Libraries
AIStartAcquisition
short
error
=
AIStartAcquisition
(short
device
, char
channelString
[],
int
bufferSize
, double
scansPerSecond
,
double
highLimitVolts
, double
lowLimitVolts
,
double *
actualScanRate
,
unsigned long *
taskID
);
Purpose
This function starts a continuous asynchronous acquisition on the analog input channels specified
in the
channelString
. Data is acquired into an internal circular buffer. Use
AIReadAcquisition to retrieve scans from the internal buffer.
Parameters
Input
device
short integer Assigned by configuration utility.
channelString
string Analog input channels that are to be sampled.
bufferSize
integer The size of the internal circular buffer in scans.
scansPerSecond
double Number of scans performed per second. Any
particular channel is scanned at this rate.
highLimitVolts
double Maximum voltage to be measured.
lowLimitVolts
double Minimum voltage to be measured.
Output
actualScanRate
double The actual scan rate may differ slightly from the
scan rate you specified, given the limitations of
your particular DAQ device.
taskID
unsigned
long integer
An identifier for the asynchronous acquisition.
Return Value
error
short integer Refer to error codes in Table 10-5.
Parameter Discussion
channelString
is the analog input channels that are to be sampled. Refer to the Channel String
for Analog Input Functions subsection of the Easy I/O for DAQ Library Function Overview
section of this chapter for the syntax of this string.
taskID
is an identifier for the asynchronous acquisition that must be passed to
AICheckAcquisition
AIReadAcquisition
AIClearAcquisition