Since neither the analog out or digital are hardware timed (both are on demand - software timed), the max rates are going to be similar. Also, with software timing, the rates are going to be highly variable and not really something you can rely on.
Are you telling me that it would take 6.667 ms to set a digital bit using DAQmx software (via USB 2.0)??? Could someone (from NI) please tell me that ain't so?
Like Dennis said, since the DO are software timed we can't really tell what's the DO maximum frequency. It depends on a lot of factor, like your hardware, your OS, ...
Regards,
Message Edité par Maxime MULLER le 02-29-200807:09 AM
As mentioned, the rates you can expect will vary on a per system basis and also based on how quickly you are able to call the DAQmx write. Just as a reference, using LabVIEW and just toggling lines on my Dell GX280 desktop I was able to achieve an average period of ~2ms. This was with a 2ms wait added but was similar for a 1 ms wait and there was significant jitter. If you're looking for higher deterministic rates (like generating a digital waveform) then you'd be best served looking at a USB-M Series like the USB-6221 which support correlated DIO.
