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Chapter 2 Function Reference — SCAN_Sequence_Setup
NI-DAQ FRM for PC Compatibles 2-304
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National Instruments Corporation
SCAN_Sequence_Setup
Format
status = SCAN_Sequence_Setup (device, numChans, chanVector, gainVector,
scanRateDivisorVector, scansPerSequence,
samplesPerSequence)
Purpose
Initializes the device for a multirate scanned data acquisition operation. Initialization includes
selecting the channels to be scanned, assigning gains to these channels and assigning different
sampling rates to each channel by dividing down the base scan rate.
Parameters
Input
Output
Parameter Discussion
numChans is the number of entries in the three input vectors. All three input vectors must
have the same number of entries.
chanVector contains the onboard channels that will be scanned. A channel cannot be
listed more the once. Refer to Appendix B, Analog Input Channel, Gain Settings, and
Voltage Calculation, for valid channel settings.
Name Type Description
device i16 assigned by configuration utility
numChans i16 number of channels
chanVector [i16] channel scan sequence
gainVector [i16] gain setting to be used for each channel
in chanVector
scanRateDivisorVector [i16] rate divisor for each channel
Name Type Description
scansPerSequence i16 the number of scans in a scan sequence
samplesPerSequence i16 the number of samples in a scan sequence