Measurement-computing UL for NI LabVIEW Manual do Utilizador descarregar pdf (Página 81)

Universal Library Virtual Instruments (VIs) Digital I/O VIs

Context Data structure containing information from a background operation. Some of the

information included is the board number, the data array, the array size, and the

initial status of the background operation.

Follow the steps below when wiring this VI:

1. DInScBg.VI starts a background operation.

2. GetStatus.VI checks for completion (boolean output called "Running").

3. StopBg.VI terminates the operation, if not already done, and frees memory aliases.

4. Data output from the background operation is passed to GetStatus.VI and StopBg.VI

via Context, and can be wired from one or both of them for intermediate or final

actions, respectively.

The demo VIs illustrate this process effectively.

Rate

(output) Actual update rate in samples per second.

ErrCode

Error code returned from the Universal Library. Zero if no error occurred. Use the

ErrMsg VI to convert

ErrCode into a readable string.

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Measurement-computing UL for NI LabVIEW Manual do Utilizador Página 81