Can't see COM port

Hi,
I'm trying to read in serial data from an Arduino Uno board that's connected via USB on Windows. I have the driver installed, and the Device Manager in Control Panel shows an "Arduino UNO (COM3)" listed under Ports (COM & LPT). Furthermore, the serial monitor in the Arduino software is succesfully displaying values read from the board.
However, when I tried using the sample VI posted here (serial_arduino3.vi):
http://ni.i.lithium.com/t5/LabVIEW/Writing-terminal-COM-data-to-graph-using-Visa/m-p/1511430
I could not change the COM port in the front panel - only COM1 was listed, and when I clicked on "Refresh" nothing happened.
any suggestions?
thanks,
imran

Can you see it in max? Also have you just tried typing com3 into the control?
=====================
LabVIEW 2012

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VISA "Find" not seeing COM port but Win7 sees it

Allo. I'm trying to communicate via virtual com ports with a device with an FTDI chip. The device with the FTDI chip has both a USB type B port as well as a 9 pin dsub port, and I need to verify both ports work.
I'm using a laptop with Windows 7 and my program is in LV 2010. I have a Sabrent USB to serial cable to test the dsub port, and a standard USB cable to test the other port. I've installed the latest FTDI drivers and when I plug in both cables and look under Windows Device Manager, I will see both of them under unique COM port settings (usually COM4 and COM 5). So Windows sees and recognizes both virtual COM ports, and no yellow warnings.
However when I run the "VISA Find" function in LabView, it only sees COM5 (the Sabrent serial cable) but not the COM port using the USB type B cable. I send the results of the "VISA find" to a display and it will show other ports, like the parallel port, so I know it's seeing more than one port.
Any ideas why Windows can see the two COM ports but the "VISA Find" function can only see one? My guess is there's something with the FTDI driver set up.
Amateur programmer for over 10 years!

Yes, but its not for the faint of heart!
You can probably do what you want by using the refresh "F5" in MAX or add this token
[VISA-CONFIG]
ShowRegisteredDevOnly = 0
to C:\ProgramData\National Instruments\NIvisa\visaconfig.ini
Another thing to try is to recover the unused COM Port numbers each time you change the device. By default Windows will "Save" those previously connected COM port numbers an if it sees the device again it will re-assign the old number. This means that the COM number keeps getting larger and larger. At some point the PC's BIOS will say that's rediculous and you will experience trouble.
Programatically you could call
C:\Program Files\National Instruments\NI-Serial\NiPortConfig.exe to launch the same utility. there is probably even and unpublished switch to click just that one big button for you but I can't find it.
It looks like you may be running into some part of this known issue
Jeff

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Attachments:
conection.JPG ‏27 KB

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I need to programatically change the COM port within LabView.
I am writing a program for clients and need to save the COM port settings within an exicutable. I was going to atchieve this by writing to an ini file. I cannot directly save the VISA variable but can save the following properties.
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Message Edited by Ravens Fan on 03-16-2009 10:30 AM
Attachments:
Example_VI_BD.png ‏1 KB

VISA unable to communicate with or see RS232 serial com port

I have a Dell Optiplex GX260 which has recently had Windows XP (Service Pack 2) re-installed on it. National Instruments VISA is unable to communicate with the single RS232 serial com port on the computer. Neither the "VISA Resource Name" control in LabVIEW 8.5 nor the "Measurement and Automation Explorer" can see the serial port. Refreshing the list does not help. "HyperTerminal"is able to both see and communicate with instruments connected to the serial port. In Windows "Device Manager, the serialport appear in the list of hardware without any warnings.
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Solved!
Go to Solution.

AKA_TG wrote:
Just passing by but I gotta say
Guyts who answer like that do really irritate me
Someone oughta apologize to the porr guy trying to get some help here.
Go ahead and put me on your ignore list please!
First, there is a plethora of messages on this forum and a plethora of information in the NI KnowledgeBase. If someone doesn't make the simple effort to take 5 minutes to perform a search what does that say? The issue being raised has come up, literally, dozens of times. Do you like answering the same question over and over and over and over and over again?
Second, my feelings are not unique. You will find that the irritation of people not bothering to do a simple search is shared by most of the regulars here. Why do you think search engines are available? Just so that ads can be sold?
Third, posting the SAME question in multiple threads is self-defeating. People who try to answer don't know what's already been suggested, and end up wasting their time as well as the poster's time in providing the SAME answer and/or suggestions that were provided in the other thread.
Fourth, simple forum netiquette. In both threads the poster essentially hijacked someone else's thread. This is frowned upon in just about every forum that I've ever seen.

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Can't see COM port

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