Measurement Computing ADLIB WIN - Manual (Page 66)

Chapter 19 Digital Input/Output 18-2
18.2 AL_DigOutput
Prototype C\C++
ERRNUM AL_API AL_DigOutput(LHLD lhld, long lChan, long lOutputData, long
lMaskBits);
Visual Basic for Windows
Function AL_DigOutput(ByVal lhld As Long, ByVal lChan As Long,
ByVal lOutputData As Long,
ByVal lMaskBits As Long) As Long
LHLD lhld handle of the LDSD
long lChan specifies the output port channel number
long lOutputData specifies the data to be output
long lMaskBits
specifies the output port masking bits
The AL_DigOutput function immediately sets a digital output port.
Parameter Description
lhld Identifies the instance of the logical device subsystem.
lChan
Specifies the output port channel.
lOutputData
Specifies the output data to be sent to the port.
lMaskBits
Selects the bits that the function will operate on. All bits set in the mask will
be acted upon. Unselected bits in the mask will not change state.
Returns:
On success ERRNUM is set to 1, otherwise ERRNUM contains the negative error code that occurred
during the call.
Note:
Digital IO channels 0 & 1 for all supported hardware are only 8 bit ports. Digital Channels 2 & 3, for all
except a Pci5500 (which don’t have ports 2 & 3), are 16 bit ports. The lChan parameter for all Pci55xx
boards should be set to zero. All four digital ports are hardware programmable as either input or output
ports and are represented by DOTx for output ports. Port direction programming is determined by the first
call to either the AL_DigInput or AL_DigOuput functions.
Related Functions:
AL_DigInput
AL_DigBitsTest
Program References:
Adldio01, Adldio23
Supported Logical Device Subsystems:
Pci5500: DOT0, DOT1
Pci55xx Series: DOT0, DOT1, DOT2, DOT3
Program References:
Adldio01, Adldio23