Measurement-computing ADLIB WIN Instrukcja Użytkownika Pobierz pdf (Strona 119)

Chapter 39 Counter / Timer

26-1

26.3 AL_CounterIn

Prototype C\C++

STATUS AL_API AL_CounterIn(LHLD lhld);

Visual Basic for Windows

Function AL_CounterIn(ByVal lhld As Long,) As Long

LHLD lhld handle of the LDSD

After the Counter has been initialized, AL_CounterIn function immediately retrieves the current count of

a Counter Input port. The first time AL_CounterIn is called the return number is meaningless and returns

a value of zero; subsequent calls return the number of counts since the last call to AL_CounterIn in

PULSE_COUNTER_INCREMENTAL mode or the totalized number of counts for

PULSE_COUNTER_CUMMULATIVE mode. See the function AL_SetCtrMode for specific mode

settings.

Parameter Description

lhld Identifies the instance of the logical device subsystem.

Returns:

On success STATUS contains the current count, otherwise ERRNUM contains the negative error code that

occurred during the call.

Related Functions:

AL_SetCtrMode

AL_GetCtrMode

Supported Logical Device Subsystems:

Pci55xx Series: CTR0, CTR1

Note that CTR0, CTR1 Counters are referenced in the user manual as CNTR0/1.

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Measurement-computing ADLIB WIN Instrukcja Użytkownika Strona 119