how to send data into parallel data port by visa interface?

[mmm2006]

HI, all,

i want to send data to parallel data port by visa interface. I get a example vi from

ni webpage. But it seem that it cannot work. Becuse when i set a value. read value

by other tool, nothing is set.  Can you tell me ho to uset it?

http://sine.ni.com/devzone/cda/epd/p/id/4213

I attached that example too.

Thanks.

[peter_liu]

Hi,

Can you tell me more details how you verify the data you have sent?

what is the instruments that you are communicating to?

NI AE Yang Liu

[mmm2006]

hi peter_liu

After  set, i can use Parallel_Debug.exe to read data register, but no change.

For labview example proram:Parallel Port Read and Write Loop.vi, it has the same result.

So i don't know how to set data register by visa interface. I mean if i use Parallel Port Read and Write Loop.vi

or Parallel_Debug.exe  to set data, it can work.

I try to communcate with a test board, it need command to open switch on it.

thanks.