User manual

Chapter 3 Software Overview
© National Instruments Corporation 3-67 NI-DAQ User Manual for PC Compatibles
Digital Group I/O Applications
Digital group I/O applications use one or more digital ports as a single
group to input or output digital information, except for the PCI-6115 and
the PCI-6120, which can create groups smaller than the port size for digital
operations.
Figure 3-23 is a flowchart for group digital applications that input
and output data one point at a time. Only the DIO-32F and 653X devices
can execute group input or output one point at a time.
Figure 3-23.
Simple Digital Group Input or Output Application
No
Ye s
Done?
DIG_Out_Grp
DIG_Grp_Mode
DIG_Grp_Config
Output data from group.Input data from group.
DIG_In_Grp
DIG_Grp_Status
Not Ready
Ready
Check if group is ready for transfer.
Alter handshaking mode?
Configure groups for input or output.