Error 1073807339 VISA READ TIME OUT

[Seabass666]

Hi! I am writing a VI used for Razorbill RP100 strain cell power supply. 

I wrote a small and simple VI to see if I can communicate with LabView and it turned out that VISA Read got problem every time, getting Error 1073807339.

I can write and read from NI Max VISA panel perfectly well, and I have installed NI VISA on my laptop. 

The VISA open doesn't have problem so I assume it's not the problem from the connection.

I got the baud rate and other stuff from the settings of VISA panel of NI MAX( when the read and write were working well).

I followed the suggestions from here: https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z0000019L3mSAE&l=en-GB ; but neither of them worked.

Does anyone have any ideas on how to solve this?

Thank you!

[RavensFan]

1.  Do you know if your device will respond to the command *IDN?

2.  In your string to write, you have *IDN?\r\n   Is that string constant in normal mode or \Code mode?  Make Sure it is in \Code mode.  (This is item "D" in the link you attached.)

[cbutcher · Accepted solution]

Hi,

• *IDN? is allowed as a command, so I also suspect that you've used the default string display, and if you switch it to \ Display you'll see "*IDN?\\r\\n" (note double backslash - the first escapes the second).
  • To fix this, whilst in the \ mode, remove one of each pair of \. Then you'll see "*IDN?\r\n". If you go back to the normal display, you'll see a 2 line string constant.
• Your device always replies with CRLF, but LabVIEW will only allow 1 termination character - you can set this to LF and then trim the CR each time, but creating a subVI to do that for you might be useful
• Your device accepts any of CR, LF, or CRLF as terminators, so you can just use one to make it a bit simpler (especially if you choose to use the LF constant (or CF, etc) and Concatenate String, which removes ambiguity regarding display styles).

[Seabass666]

Hi! Thank you for replying. 

I tested it and I think the device can't read *IDN? itself but has to have a \n as well.

[Seabass666]

Thank you!

I added one block for termination character and finally I can read string.