MAX does not see the computer's serial port (RS-232)

[DanceWiz]

Hi,

MAX (Measurements and Automation Explorer) cannot see the computer's serial ports (9 pin RS-232s).  I am using Labview 7.1, and running Windows XP (although I believe that the manufacturer has also installed Windows Vista).  When I go under Control Panel> Systems> Hardware> Device Manager> Ports, I do see both of the ports (COM1 and COM2), and both have the latest drivers on them.  Does anyone know of any way to add the "Ports" sub-branch under the "Devices and Interfaces" branch in the Configuration tree in MAX? 

Thanks in advance for any suggestions.

P.S.  Labview had been shutting down in the middle of editing a block diagrams a number of times before and I reinstalled it a few days (without getting rid of the problem, unfortunately).  I wonder if this problem with MAX is somehow related to that...

[Dennis_Knutson]

Do you have NI-VISA installed? You can check by expading the software listing in MAX.

[DanceWiz]

Hi Dennis,

Yes, NI-VISA 4.4 and NI-VISA Runtime 4.4 are listed under Software in MAX.

[ghlaah]

1. How about your OS's version, is it a professional version or modified version? Mybe you need take care of your Operating System;

2. Please open your COM port's property dialog and check if the default value was change? this issue maybe happen on a modified OS.

[Dennis_Knutson · Accepted solution]

You could try upgrading to 4.5 or simply unistalling/reinstall the version you have.

[DanceWiz]

Hi ghlaah,

It is an unmodified, professional version.  I checked the COM port's property dialog and the default value has not been changed.

[DanceWiz]

Hello again,

I just upgraded to 4.5 and it has solved the problem.  Thank you very much for your help.

[Dennis_Knutson]

I suspect that reinstalling 4.4 would have solved the problem as well but I'm glad that it's working.