how to reduce reading and recording data time/ Visual C++, PCI 6024E and PCI-MIO-16E?

[lwang2]

Right now I am working on a data communication programme. The time of reading digital signal and recording data is more than I expected, which is about 100 microsecond. I need to reduce the time. The software I am using is Visual C++ 6.0. I use two DAQ boards, which are PCI-6024E and PCI-MIO-16E. I have set the priority of Visual C++ to be realtime by task manager. The operating systme is Windows XP.

I am wondering how to set the interrupt of reading or writing data to be the highest and stop any other kind of interrupt.

Thanks in advance!

[JasonSmith]

The primary limitation you will encounter when trying to do high speed digital I/O using your E-Series hardware is that the digital lines are all software timed.  This means that for each and every digital read it is necessary for your software to issue a command to your hardware, read a single point, then receive the response from the board.  This prevents you from performing digital operations at very high speed.  In general, I would say that 100 microseconds is a very good response using software-timed digital I/O on a Windows computer.

It is difficult to make a good recommendation without more detail about what you are trying to do.  You may need to consider switching to a Real-Time operating system, or upgrading your DAQ hardware to a board that will allow you to time your digital acquisitions on the board itself.  These devices, such as the m-Series DAQ or the PCI-653x series, would allow you to use hardware triggers for your digital acquisitions, change detection, and buffered data acquisitions to reduce the software overhead involved in a rapid acquisition.