Hello, I am trying to read data from the gaussmeter but I am getting problem while running program, the bytes read is atomically getting zero, Before running the program I was giving value of 1000 bytes read, after compiling the program bytes read is getting zero and no data is getting potted in the chart. Could you please give me your suggestion, Did I do mistake anywhere in the program. I am attaching the front panel and block diagram of my code. Could you please check it and looking forward for your help. Thanks Vijay

Ok, you have a few problems here. 1. The command you are writing is wrong. You are sending "*READ?" when it should be ":READ?" (you used a star instead of a colon). 2. It appears like you did not terminate your command with a Line Feed. It is really hard to tell when looking at a string in "normal" view. You might want to change that to use "\ Codes" if you are going to include it in the string. I just use Concatenate String with a Line Feed Constant to make sure it is at the end of the command. 3. DO NOT USE THE BYTES AT PORT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! (still not enough emphasis). I could go on a big giant rant here. But to keep it really simple for you, you just need to tell the VISA Read to read more bytes than you ever expect in a response and the VISA Read will stop reading when it encounters the termination character (default is a Line Feed). This will ensure you are getting the full response back and not part of a message. So with that said, here is the code I recommend you start with. Also attached is the VI saved in LabVIEW 2009, so you should be able to open it.

LabVIEW

Unable to read data from the Gaussmeter

Solved!

@vijay0507 wrote:

So my doubt is how do I convert the values in milliTesla in waveform chart same as instrument values.

Just multiply your readings by 1000.

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