Measurement Computing ADAC-LVi - Manual (Page 32)

Chapter 2 Intermediate Analog Input VIs
ADAC LabVIEW VI 26
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Clock Rate (100) Clock Rate is a double value that specifies rate at which clocks occur.
The units can be either Hertz (samples per second) or TICS.
See the Clock Rate Units setting for details.
Number of Buffers(1) Specifies the number of buffers the VI allocates. This parameter
defaults to 1, and should only be changed for multi-buffered acquisitions.
Buffer Size (-1) Buffer Size is the number of samples you want each buffer to hold. If
Buffer Size is set to -1 the buffer size will be will automatically set to number of
channels specified. Buffer Size should always be set to a multiple of the number of
channels specified on the Channel List. For example a channel list of "0,1,2" three
channels should have its Buffer size set to 3, 6, 9, 36, 300, ..., or any multiple of three.
This requirement is needed to align buffer starting channels when the Number of Buffers
exceeds 1.
error in (no error) Error in describes error conditions occurring before this VI executes.
This cluster defaults to no error.
Device Handle Device Handle is a numeric value that identifies the board's A/D
subsystem to be acted upon in subsequent VI subsystem calls.
Actual Frequency Rate Actual Frequency Rate is the actual interval between samples in
hertz. The actual sample frequency can differ from the requested sample rate, depending
on the clocking capabilities of your selected device.
error out Error out contains error information. If the error in cluster indicated an error,
the error out cluster contains the same information. Otherwise, error out describes the
error status of this VI.
ADAC AI Start Device
This VI starts analog input acquisition on the specified Device Handle. All configuration
of the device must be completed before calling this VI.
Depending on the current ADAC-LVi transfer mode this call may not return until
completed. See ADAC AI Config VI for detailed information on asynchronous
operations.