Place HP 34401A in Local Mode with GPIB-USB-HS

[leto_II]

Hello, 

I'm using LabVIEW 2010 SP1 to control the HP 34401A with the NI GPIB-USB-HS device. I'm using the built-in 34401A instrument I/O drivers.

If I have everything connected, the 34401A will immediately be placed in "Remote" mode when I run my software. However, I'd like the ability to use LabVIEW to force the 34401A to "Local" mode. Unfortunately I haven't been able to find a way to achieve this. I've tried Close.vi, but that doesn't have an effect.

Here's my intended operation if it makes things more clear:

1. Launch the software
2. Initialize the 34401A
3. Place the 34401A in 4W-resistance measurement mode
4. Switch the 34401A to "local" mode so that the end user can adjust a trimpot until the desired resistance is obtained while seeing the resistance value change on the 34401A
5. Re-initialize the 34401A when I need to switch to a different measurement

Alternatively, is there a way to get the 34401A to continuously display whatever measurement it's taking while in remote mode?

Best regards,

Ian Williams
Linear Applications Engineer
Precision Linear and Sensing Products 

[Dennis_Knutson]

Why don't you try the VISA GPIB Control REN function?

[leto_II]

Dennis,

I actually needed the opposite - enable Local instead of enable Remote. Regardless, your suggestion led me to digging around in the GPIB commands and I found what I needed. Thanks for the tip!

Best regards,

Ian Williams

 

[Dennis_Knutson · Accepted solution]

The function I mentioned does exactly the same thing except you don't have to do that goofy parsing of the address. It's a VISA function and you should have just used the search button to find it (and turned on Context Help) to get the explanation of what it does.

[leto_II]

Dennis,

I apologize if I offended you. I found the function you suggested and it's indeed a more elegant solution. Many thanks for the help.

Best regards,

Ian Williams

 

[Dennis_Knutson]

No offense was taken.