USB Thermometer works in Hyperterminal & MAX, but not in my VI

[Chknrckd]

I have USB thermometer (Omega TJ-USB).  I've communicated with it successfully in Hyperterminal.  When i go to try it with MAX, it usually starts working after the second attempt at write/read.  But even though i set the termchar to 0xD and termchar_en to True, i still have to type my write as 'C\r' for it to return '20.2 C\r' (20.2 C being the temperature)  Any idea as to why this happens?

Also, i go ahead and make my VI, very similar to the one found in this labview tutorial - image shown here:  http://zone.ni.com/cms/images/devzone/tut/a/e09bfd41228.gif  I set it for baud:38400, 8n1.  and i also write 'c\r', but i get the 1073807339 error.  I tried changing the buffer with no change in results.

I thought this would be a fairly straight-forward task, but it seems like I am wrong, or overlooking something simple.  

[Dennis_Knutson]

Setting the term character with the VISA Configure Serial Port has nothing to do with a write. It determines what character will terminate a read.

Post your VI. Are you sure you right clicked on the string control and selected '\' Code Display?

[Christopher_T. · Accepted solution]

Hi Chknrckd,

Also what could be the issue is the way hyperterminal sends out characters (when you type that is). LabVIEW will send out a string at a time, while hyperterminal sends out individual characters at a time.

More information could be found here:

Why Does My Serial Instrument Work in Hyperterminal But Not in LabVIEW or VISA Test Panels in MAX?

http://digital.ni.com/public.nsf/allkb/171D2D70CFB66E74862571390062D12B

Hope this helps!

[Chknrckd]

yep. that was the problem. thanks Chris!