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Chapter 14 Logical Device Start / Stop Operations

13-2

13. LOGICAL DEVICE START / STOP OPERATIONS

Once a device has been fully configured and initialize it is ready to be started. Starting a device consist of

informing the hardware to begin it’s acquisition. Depending on the specified cycle mode of the device the

acquisition may be continuous or single cycle. For continuous mode the device acquisition may be stopped

at ant time with a call to AL_StopDevice. One a device is stopped; it may then be reinitialized and

restarted.

13.1 AL_StartDevice

Prototype C\C++

ERRNUM AL_StartDevice(LHLD lhld);

Visual Basic for Windows

Function AL_StartDevice(ByVal lhld As Long) As Long

LHLD lhld handle of the LDSD to be started

The AL_StartDevice function puts a device in the run mode. Depending on the current ADLIB transfer

mode this call may not return until completed. See AL_SetDataTransferMode for more details on ADLIB’s

foreground and background operations. Another feature of the PCI5500 ADC0 or Pci55xx ADC0 and

DAC0 allows the conversions to be controlled via software (CGEN Control) or an external signal after

AL_StartDevice is called, this feature is detailed in the user manual as ADC or DAC Software Gate and

ADC or DAC External Gate features. To implement either Gating features using ADLIB, see the

AL_SetGateXXX functions described in this manual.

Parameter Description

lhld Identifies the instance of the logical device subsystem to be started.

Returns:

On success ERRNUM is set to 1, otherwise ERRNUM contains the last error code that occurred during the

call.

Related Functions:

AL_StopDevice

Program References:

Adlai01, Adlai02, Adlai04, Adlai05, Adlai07, Adlai08

Adlda02, Adlda03

Supported Logical Device Subsystems:

Pci55xx Series: ADC0, DAC0, DAC1,

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Measurement-computing ADLIB WIN Bedienungsanleitung Seite 54