LabVIEW
LabVIEW serial port programming using the WinAPI and CreateFile() and CloseHandle()? Yes or no?
Solved!
"It’s called the NIH (Not Invented Here) syndrome. It’s highly contagious among engineers and incurable.
"
But is that really it?
Or, rather, is it I know it'll work if I do it? If you don't know exactly how something works, how do you know it'll continue to work as it has in the past? Perhaps there's a gotcha! in there. You don't want a gotcha! with Mr. Murphy's hypothesis about your domain. That's what engineering is about. It's about designing something that works and continues to work. That's the challenge.
Some engineering is designed not to work in perpetuity, as such engineering would crush the sales numbers. However, I submit that such engineering is actually successful engineering, for it is doing what it was designed to do: sustain and/or increase sales. But nowadays, sustaining is actually increase.
@*3d0g wrote:
Some may ask, "why resurrect this old thread -- I thought this was solved?" To this I return to the post that started the thread where I said, "explain at least a little bit how it'll work."
I don't think the explanation ever came in, and I'd still like to hear it.
If using VISA, how could it be done? How could I successfully (not an attempt that may or may not succeed) do the equivalent of what's been done independent of VISA?
To recap, here's what's been done:
The VI
1) accepts only a number, a number that should be a valid COM port number but may not be valid
2) accepts a string of hexadecimal bytes, simply a string like 000102030405060708F1E2D3
3) transmits the string out the COM port, if possible, and receives the response, if there was one
4) if it wasn't possible simply identifies where there was an error and does not crash the VI
I still don't think it is possible using VISA. But yet, just because I think something it doesn't mean I am correct.
This was said many weeks ago. VISA does this already. It takes 3 seconds. Wire "COM4" to the VISA Resource input and it works fine
If you want to simplify it to being just a single number, use a Format Into String with the format code "COM%d" and wire in the single number. That's it. That's all there is to it. Yes there is a coercion dot. No it's not a problem. If you don't like the dot you can use "Coerce to type" and it would've gotten rid of the dot.
