Nidaqmx and change of state interrupts on DIO

Hi All;
Does DAQmxbase support interrupt on change of state on a DIO port? I'm looking for a way to generate an interrupt ( sigusr2 or similar) whenever any bit changes on the dio port.
Is it possible to split the dio port into 4 bits in/4 bits out?
Pat

Pat,
What hardware are you using the DAQmxBase driver for? The ability to generate interrupts when DIO bits change are dependant on the hardware used rather than the driver. The hardware should be capabable to perform change detection operation in order to be able to generate interrupts based on changes to bits on the port. Also, some devices can be line (bit) configurable and some are only port configurable. In other words, your hardware might be one of those devices that support line configurability. Please look at the following knowledgebase entery to verify that your hardware is capable of performing individual line configuration. If your hardware supports individual line configurability, you could split the DIO port to half in and half out.
Which Devices Can the DIO Lines Individually Configured?
Can You Configure the Individual or Single Lines of the 8255 Digital Chip?
If you still have further questions pertainent to this issue, please post them and I will address them.
Ayman K
Applications Engineer
National Instruments

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boolean_count.vi ‏12 KB

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