Error code 1073676294 in visa read

[Ashley.w]

Hi

I am communicating to my instrument over a serial link using string commands with the the code attached.  I keep getting the error code 1073676294 pop up at the serial read function.

This is strange though because the VI seems to execute ok, i.e. the error handle transmits the ok message despite the error code popping up.

Can anybody shed light on this?

Many thanks

Ashley

[Marc_A]

I looked up the error code, and all it's saying is that when you called VISA Read, it returned the same amount of data that you requested and there could be more waiting.  This happened because you have the property node with "Bytes at Port."  I imagine this is just a warning.  If you set the byte count input of VISA Read to something high like 4000 instead of using the property, you won't get the error.  Make sense?

[Ashley.w]

Many thanks Marc

Does indeed make sense

Regards

Ashley

[Rodnebb]

Hi,

wouldn't setting the bytes to read at a very high number (4000 is suggested) have some negative side effects (lowering performance springs to mind).

I have this error even though I've been a good boy and checks the number of bytes at port with the "serial instr" node (the serial instr returns a too low bytecount) and I'm looking for a solution.

[Marc_A]

Not really. It will stop reading when it gets to a termination character. I always just set it to a number bigger than what I'm expecting. If it never gets a termination character and isn't able to get as many bytes as you told it, you'll get a timeout expired before operation completed error. Although that shouldn't happen if everything is set up right. The error Ashley was getting is really just a warning, though. It's telling her that there still might be data at the port. Simply adding 1 to 'bytes at serial port' would probably even get rid of the error.

Message Edited by Marc A on 03-29-2007 08:37 AM