05-14-2010 09:52 AM
Hi,
I planned to output a TTL pulse with a specific timing.
I used a vi modified from an example(shown in the picture below and the vi is attached). I planned to read a column of integers of 0(0V) or 1(5V) from a spreadsheet and specify an update rate so the timing of this pulse can be controlled. I have done similar things with analog output and it has been working fine for me. Now I would like to do analog and digital output at the same time. I just need one digital ttl pulse and would like to know the relative timing between the ttl pulse and the analog output.
I got this error.
Possible reason(s):
Measurements: Requested value is not a supported value for this property.
Property: SampTimingType
You Have Requested: Sample Clock
You Can Select: On Demand
Task Name: _unnamedTask<15>
the output card is pci-6713 and i also have a pci-6032e card. both card would show this error. I was wondering if i could do digital output with timing with either of the two cards and if they only support software timing, if there is any way to get around. thanks,
05-17-2010 11:45 AM
Hi Zexi-
Unfortunately, both the 6711 and the 6032e only support software digital I/O timing. How fast are you wanting to go through this digital data? If you are wanting to update really slow, say 10 times a second, you will probably be okay with software timing. Software timing above 500Hz-100kHz definitely gets really non-deterministic, but at lower frequencies, software timing might be okay. This all depends on how fast you want to go, your system setup, etc.
I hope this helps. If you want timed digital output, you should look into the X Series DAQ cards. They have a dedicated clock for the digital lines.
Best of luck with your application!
05-19-2010 09:56 PM