LabView VISA problem

Hi, I'm very new to LabvView and I'm having trouble with communicating
with an instrument. It's on an RS232 port Com1. I decided to test if
LabView could communicate with the device so I loaded the setup
software that came with it which established a connection on Com1. So I
went into Instrument I/O assist and I was able to successfully validate
the the port settings. I went into the VISA test Panel and I ran the
Basic I/O *IDN?\n and I got I read count of 6 back, but a status of 0.
I executed viGetAttribute VI_ATTR_TMO_VALUE and it returned 2000. So I
added a Query and Parse step for the *IDN?\n command and I get a
timeout Status code : bfff0015 no matter what I set the timeout value
to. So I'm wondering if this means the VI's that came with our
instrument won't be able to communicate with it. Or is there some
obvious thing I'm doing wrong?
Thanks for your patience,
-Shane

Hi Shane,
Also make sure that you are using the proper termination character with the command you send to your device. Here and here are documents that discuss adding termination characters automatically for you with VISA. Otherwise, you can just add this character to the end of the string you write to the device. I hope this helps!
Regards,
Missy S.
Calibration Engineer
National Instruments

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Set lvapp = CreateObject("LabVIEW.Application")
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Message Edited by Roger Isaksson on 09-09-2005 10:22 AM
Message Edited by Roger Isaksson on 09-09-2005 10:22 AM
Attachments:
VBError.JPG ‏181 KB
Test1.vi ‏9 KB

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I haven't tried this yet but I had the same problem as you. This was
pasted from an earlier response from a post I made a month ago.
>There are 2 things to try here:
>1) Set the serial input end mode attribute to 0. The
>attribute/property name is either "ASRL End In" or "Serial End Mode
>for Reads".
>2) Use the "VISA Set I/O Buffer Size" function in the VISA Interface
>Specific subpalette. This will let you set the receive and/or
>transmit buffer size.
>LabVIEW VISA Software Dude...
Koen wrote:
> Hello,
>
> I have the following rather strange problem with serial communication
> on a Macintosh:
>
> 1. I wrote a program using the simple serial VIs provided in LabVIEW
> and write and receive amounts of data up to about 25000 bytes. The
> serial buffers are bo
th set to 32000 bytes. If I wait long enough
> everything works perfect (this was just a test VI for reference)
> 2. I wrote the same program using VISA calls, I initialize the port
> exactly the same (or so I think), set and flush both read and write
> buffers. Then I send the data, which seems to work, except that I have
> to increase the general time out of the VISA session (which is already
> odd as it should just be sent to the buffer). However the read
> operation allways fails. It seems that no matter how long I wait after
> the write operation the buffer only contains 63 bytes, where is the
> rest going (from the program described above and the reaction of the
> instrument I know that everything is sent!)? What I read is the echo
> of what is sent plus one extra byte, it seems that those 63 bytes are
> the first 63 that are sent, the buffer is thus not overwritten as I
> would expect if the buffersize was to small.
>
> If anyone could shed some light on this problem I would be
very
> greatfull.
>
> Best regards
> Koen

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Message Edited by Tunde A on 04-18-2007 02:28 PM
Attachments:
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The instrument driver for the HP 35670A is only
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wfarid wrote:
Hello,
I'm working on a data logger at 200 Hz frequency. I wanted to log the data to a file after eace sample received. When I used (fopen,fprintf,....) on Mathscript, the Labview started to log the data at a slower rate. I then used the Labview file VIs and it is working fine up till now.
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Hello,
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解決済！
解決策の投稿を見る。

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日本ナショナルインスツルメンツ株式会社　技術部　巳波裕介
Yusuke Minami, Applications Engineering, National Instruments Japan
技術サポートウェブページ:　http://www.ni.com/support/ja
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Does anyone have a VI or utility that will collect lines of code equivalents
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Wesley Wong wrote:
> Does anyone have a VI or utility that will collect lines of code equivalents
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