Error finding third party device with VISA

[lauraalkhoury]

Hello all,

Background: I'm using this tutorial to learn how to communicate with my third-party USB device using NI-VISA (bear with me, I'm a newbie). I'm using a Windows 7 64-bit laptop.

Problem #1: I've used the Driver Wizard to successfully create the .inf files for my device, but when I try to install them in the last step of the wizard, I get the following error: "ERROR 1073676407: VISA failed to open resource manager session" (see attached image). It asks me to verify that my device is recognized under NI-VISA Devices in Windows Device Manager (it is, see other attached image).

Problem #2: Proceeding with the instructions, I copied those .inf files into C:\Windows\inf. According to the tutorial, right-clicking the .inf file and selecting "Install" should create a .pnf file. It doesn't.

Question: I'm sure either one or both of these problems is why I can't see my device in MAX. How can I resolve them? Also, if my device is already recognized as an NI-VISA device in the Windows Device Manager, shouldn't I be able to see it already in MAX?

Many thanks,

Laura

[Dennis_Knutson]

Why did you use the VISA Wizard? If it's an FTDI USB-RS232 port you simply had to use the driver from FTDI. You will have to completely undo all of the steps that you performed with the wizard.

Please, take note that the tutorial is only to be used when a USB connection does not already have a driver. It should NEVER be used simply because you have a USB device. Perhaps if you had responded to the question I asked in your other post, you could have avoided a lot of unnecessary work.

[lauraalkhoury]

Wow, that was a HUGE fail on my behalf, and here I thought I was making progress.

I followed your instructions, undid everything and used the FTDI driver. Working on it now.