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Chapter 2 Function Reference — SCAN_Start
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National Instruments Corporation 2-309 NI-DAQ FRM for PC Compatibles
SCAN_Start
Format
status = SCAN_Start (deviceNumber, buffer, count, sampTimebase, sampInterval,
scanTimebase, scanInterval)
Purpose
Initiates a multiple-channel scanned data acquisition operation, with or without interval
scanning, and stores its input in an array (MIO, AI, and DSA devices only).
Parameters
Input
Output
Parameter Discussion
buffer is an integer array. buffer must have a length equal to or greater than count. For
DSA devices, buffer should be an array of i32. These devices return the data in a 32-bit
format in which the data bits are in the most significant bits.
count is the number of samples to be acquired (that is, the number of A/D conversions to be
performed). For double-buffered acquisitions, count specifies the size of the buffer, and
count must be an even number.
Range: 3 through 2
32
– 1 (except the E Series).
Name Type Description
deviceNumber i16 assigned by configuration utility
buffer i16 assigned by configuration utility
count u32 number of samples
sampTimebase i16 resolution used for the sample-interval counter
sampInterval u16 length of the sample interval
scanTimebase i16 resolution for the scan-interval counter
scanInterval u16 length of the scan interval
Name Type Description
buffer i16 assigned by configuration utility