error during writing digital output in usb-6343

[vkatre]

PFA LV10 VIs. While downgrading, it has shown a warning about the DAQmx polymorphic VIs. So I dont know if everything will work fine. Just seek the logic out of it and make your own code. 

[d_2014]

hey.. 

first of all i like to apreciate you for your front panel. it's realy so good.

Beside this problem if you can give me some tips regarding it? this will be grateful.

yet i only check "Digital - Finite Output". so can you tell me why we keep 100ms delay..? what is its min  value..? we have any data for USB 6343 daq..?

regards,

[d_2014]

continue...

in your earlier post you said.

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Query 2:
You must write to the buffer before starting the task. i.e. in the virtual channel, DAQmx Write function should come before the DAQmx Start function.

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this is opposite to your Vi. so what is right thing..?

[vkatre · Accepted solution]

1. Thank you for the compliment. But, the VIs I have posted are Sample examples in LabVIEW, so I cant take the credit for the UI. 

2. If you are using Hardware timed finite samples mode, write to the buffer then start the task. If you are using software timed (i.e. not putting the sample clock) you must start the task outside the loop, then write in the loop as many times as you want. 

3. Since software timing is implemented using wait function which takes input in milliseconds, maximum you can go is 1 ms which is 1 kHz.

4. The USB-6343 spec says "48 digital I/O lines (32 hardware-timed up to 1 MHz)". So, software timing may not be supported. 

[d_2014]

hey,..

 thanks for point 2.. it is really helpful.

so if i have to go more than 1Khz, i have to use hardware timing.?

regards & thanks,

[vkatre]

Yes. That is correct. 

[d_2014]

thanks a lot vkatre.... i solved my doughts here.. it is just small part of my task.

thanks & regards,