usb 6009 - how to conrol rate at which digital output port is updated

[Laura F.]

Hi Johnnie,

I think that you will find that your suspicions are correct.  You definitely need to take into account the fact that the minimum resolution of the wait until next millisecond multiple function is 1 ms. 

Let us know the result.

Regards,

Laura

[Johnie]

Hi Laura,

All my suspicious concerning loop controlled signal generation proved to be true. I can controll " for loop" only with a time resolution that is multiple of 1 ms.

If I do so everthing goes well, but unfortunately maximum rate I can reach without destroing the output signal is 200 hz (5 ms send to "wait until next.. " function) I expect this rate to be dependent of PC hardware I use, but however the solution for my problem seems to be found.

many regards,

Johnnie

[Steve]

When I've tried to toggle a digital output bit of a USB-6008 as fast
as possible (in a while loop with no delay), the fastest rate I could
achieve was about 1 kHz. This may be limited by the manner in which
the USB system operates. It is not running in "burst" mode.