GPCTR_Watch porting problem

[anarkie]

Hello?

My device is PCI-6025E and GPCTR_Watch function can't be ported to DAQmx clearly as long as I know.

The last parameter of this function is entity value which ranges from 0 to 2²⁴ - 1 in E series.

We used this third parameter to count up DMI samples that is feeding PFI3 pin. But there seems no way to count this DMI with any DAQmx code. How can I count this up just like MAX test panel does? The MAX test panel counts from 0 to 2²⁴ - 1.

Thanks, 

[Dan_K]

Hello Anarkie,

It looks like you're looking to perform a count edges task. There is an excellent group of examples in the NI Example Finder that shows how to perform these types of tasks in NI-DAQmx. It would be best to start with the Count Digital Events VI.



Let me know if you have any questions about any of these examples.

[anarkie]

Ah...I'm looking for Visual C++ solution not VI...

Thanks anyway.

[Dan_K]

Hello Anarkie,

You can find DAQmx ANSI C examples for the same type of function by going to Start»All Programs»National Instruments»NI-DAQ»Text-Based Code Support»DAQmx ANSI C Examples and then navigating to Counter\Count Digital Events\Cnt Dig Events. This should be what you are looking for to run in a Visual C++ application.

[anarkie]

Hello?

I know there is a function called DAQmxErrChk (DAQmxReadCounterScalarU32(taskHandle,10.0,&data,NULL)); in that folder.

But I really wonder the data parameter of DAQmxReadCounterScalarU32 is equivalent to the third parameter of GPCTR_Watch function.

Thanks,

[Dan_K]

Hello Anarkie,

The GPCTR_Watch function is defined as follows (from the Traditional NI-DAQ (Legacy)™ C Function Reference Help, Version 7.x😞

"status = GPCTR_Watch (deviceNumber, gpctrNum, entityID, entityValue)"

The third parameter, entityID, is described as the "identification of the feature you want to monitor". The correct correlation of the &data parameter would be the fourth parameter of the Traditional NI-DAQ function, entityValue.