Using tilde(~)

[Mike_RF]

That picture is the contents of the VI.  I do a line feed just to see the error on the serial port monitor (Error - Unknown command:  '~.').  Again if I enter "~." in tera term the DUT exits the menu as expected.

No error on output of VISA write

[nathand]

Any chance you can provide a link to documentation for your device? What are you using for a serial port monitor?

[Mike_RF]

I'm just using a homemade cable(rx only) with tera term to monitor serial port activity.  i don't have documentation on the device.

[Dennis_Knutson]

Serial devices don't have visible menus unless it's something like the vt100 as I mentioned. Why didn't you answer my question about that? If you do have such an interface, then the tilde may be an escape sequence and not the ascii character. TerraTerm has terminal emulation capability but VISA does not. Can you attach an image of the TerraTerm screen m

[Mike_RF]

Dennis,

    I attached a snippit of tera term.

[Dennis_Knutson]

Well, that makes it pretty clear that the serial interface, is in fact a VT100 type. You'll need to find what the tilde means for that.

[nathand]

Perhaps you could turn your setup around. Let LabVIEW (which won't do any translation) do the serial monitoring, and do the communication with TeraTerm. Send ~. from TeraTerm. Do a read in LabVIEW. See what bytes actually get sent.

[Mike_RF]

Dennis/Nathand,

      Thank you for your feedback.  I've attached a snippit of me entering ~. on the serial port and reading it back in labview.  Labview appears to be reading back ~.

I'm also searching to see if ~ is interpreted as some other character in tera term but no luck so far.

Thanks

[Dennis_Knutson · Accepted solution]

You need to be searching for VT100 references. There is a very long list of special escape characters that the interface supports and dedicated keys.

[Mike_RF]

Dennis and all,

Thank you.

Mike