Need help about using PCI-6221 and C# to control three Digital Port and one Analog input

[timinmanchester]

I need to send digital output to three ports and then read an analog voltage from Analog input by using PCI-6221.

I made a C# program to control it. I built four tasks in total. Three tasks for three digital output ports, and one task for analog input.

How can I reduce the time?

Using my method, it takes 3.3ms in total. And it is slow.

Can I build only one task for three DO ports?

What is the best way to control task to reduce communication time with PC ?

Is that possible to save a lot of analog input reading in DAQ device's memory, and then read it all together from computer to reduce time consumption?

One million thanks!

Jin

[StevenH · Accepted solution]

Hi Jin,

To answer your questions, yes you are able to configure one Digital Output Task to use three output ports, and the PCI-6221 does have an onboard FIFO memory buffer of 4095 samples.

I would like to direct you to the NI-DAQmx example files for C# which can be found at the following location on your machine

C:\Documents and Settings\All Users\Documents\National Instruments\NI-DAQ\Examples\DotNET2.0

In this location you will find prewritten examples in C# which should give you a good idea of how to go about architecting your code to achieve the results that you require.

There is also a useful Help file which can be found by navigating to Start>>All Programs>>National Instruments>>NI-DAQ>>NI-DAQmx .NET Framework 2.0 Help

I hope this response is helpful.

Best Regards

Steve H

Message Edited by StevenH on 11-19-2008 02:56 PM

Message Edited by StevenH on 11-19-2008 02:56 PM