National Instruments 320682C

Chapter 10 Easy I/O for DAQ Library

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.