niDMM_ReadStatus

ViStatus = niDMM_ReadStatus(ViSession Instrument_Handle, ViInt32 *Acquisition_Backlog, ViInt16 *Acquisition_Status)

Purpose

Returns measurement backlog and acquisition status. Use this function to determine how many measurements are available before calling niDMM_Fetch, niDMM_FetchMultipoint, or niDMM_FetchWaveform.

Note  The NI 4050 is not supported.

Parameters

Input
Name	Type	Description
Instrument_Handle	ViSession	Identifies a particular instrument session. You obtain the Instrument_Handle parameter from niDMM_init or niDMM_InitWithOptions. The default is None.
Output
Name	Type	Description
Acquisition_Backlog	ViInt32*	The number of measurements available to be read. If the backlog continues to increase, data is eventually overwritten, resulting in an error. Note  On the NI 4060, the Backlog does not increase when autoranging. On the NI 4065, the Backlog does not increase when Range is set to AUTO RANGE ON (-1), or before the first point is fetched when Range is set to AUTO RANGE ONCE (-3). These behaviors are due to the autorange model of the devices.
Acquisition_Status	ViInt16*	Indicates status of the acquisition. The following table shows the acquisition states: 0 Running 1 Finished with backlog 2 Finished with no backlog 3 Paused 4 No acquisition in progress

Return Value