labview (serial port from usb)

[Chris_R.]

Hi kehander,

Yes, it is an old thread, but still very useful info!  Thanks for posting!

As for PCMCIA-Serial hardware, you can find NI product information for our PCMCIA serial products at this link.  Click on "PCMCIA" in the upper left "Form Factor" section.  Remember, hardware purchased from National Instruments will come with a warranty AND technical support!  Much better deal in my opinion!    

Thanks to everybody for the great posts!

Message Edited by Chris_R. on 11-06-2007 02:28 PM

[K C]

Hi,

Still no real failure description like Dennis asked for 

But here is another possible solution for a problem with USB <==> Serial devices:

Add 'VISA set I/O buffer size' after your port config. My Belkin USB device won't work without it.

[convert]

hi, Giuseppe

I want to ask you about the circuit of temperature, I use to created that circuit by using COM, but it dont work. your created your own circuit too, right? if you are not mine can you give me some sample, or circuit that i can do it well?

Thanks

[RavensFan]

You should post a new message thread with your question, then it will be easier for you to get attention and help.

This thread is a couple years old.  And your question really has nothing to do with the topic of this old thread.  Also provide more detail in that new thread as it doesn't make sense as to how you would be using a Com port to measure temperature.

[carlosmayer]

   Hello Giuseppe,

   I am with exactly the same problem as you.

   Have you managed to fix it?

   Thanks. 

[carlosmayer]

    Just to complement my question, I have tryed to connect a mouse through the serial-USB converter and it worked perfectly. This appears to mean that the windows is recognizing the usb port, different from LabVIEW. I have looked in the MAX, and nothing appears. And just to remember, the same VI has worked in a desktop with serial input.

    Thanks in advance.

    ps.: I am asking here since my question is the same as the topico owner, and so I think there is no need to create another one.

[kehander]

As I wrote earlier in this thread, a USB-to-serial adapter (i.e. one that allows you to connect a serial device to a USB port) may not be adequately compatible with all devices.  Just because it works with a serial mouse doesn't mean it will work with something else.

(In fact, regardless of what you see in MAX, you could probably set up a VI to read the input from the serial mouse.) 

[Brendan_C]

Here's a success story with this problem written by a novice programmer... I'm writing this for my own records since I'm going to have to repeat this process again soon, but thought I'd copy it here as well:

I just resolved a similar problem.  Using a Conrad USB-RS232 converter... MAX (with NI VISA, Serial, and DAQmx drivers loaded) was recognizing the port's presence, but was unable to use VISA to (forgot the appropriate word that goes here... communicate?) with the port.  A previous poster's comment led me to Windows' (7) device manager (control panel>system>device manager link in upper left on my copy of windows 7) where I learned that the USB>Serial converter did not register any installed drivers (despite having installed the drivers from the DVD that came with theconverter).  I used Windows' utility to browse for a driver on the converter's DVD.  It located one, installed it, and everything is now working properly.

Thanks as always for these discussions, folks.  If nothing else, it is nice to not feel alone!

[wok]

hi,i'm trying to run an RS 232 multimeter in labview.i don't have serial in my laptop,am therefore using a serial to usb also and a'm having quite the same problem,it is saying framing error has occured.what should i do.thnx

[K C]

Hi,

Framing errors are mostly caused by wrong serial parameters. Baudrate and parity. Assuming the cable is OK.

Kees