no reading from visa read

[tk_ghani]

dear all,

I'm having some problem with visa. I need to read a data from spectrophotometer into Labview.I've tried two design for block diagram.

for the first diagram, the problem is the time out period at visa read.

for this diagram, all of the connection is ok while running but there is no reading at the read buffer.what should I do??

please help me!!!!!!!im still new with Labview....

[davidpcl]

Most VISA Instruments require you to send them a query command before they send data back - if the instrument uses SCPI (probably the most commonly used protocol) then this will be of the format of something like GETDATA? (question mark indicating a query)

Do you have a make and model number of the Spectrophotometer?

[billko]

To add to David's post, I see you've configured some, but not all, VISA serial params.  I suppose you're sure that the VISA serial defaults for the params you haven't set are appropriate?

But definitely go check the equipment programmer's guide to see how you should be addressing the equipment...