New GPIB can't control

[JerryChen8888]

Our company have a software to control Instrument by GPIB-USB. We want have set up 20 more systems. After buy new GPIB-USB, we can't connect on current software by new once But the old once working well always. How can I to adjust it? The pictures are new once. Thanks,

[cstorey]

That's not really enough detail to get good help.  Can you try to answer these questions..

 - Where did you buy the new USB-GPIB adaptors? 

 - What error messages do you get or how do you know they aren't working? 

 - How do you test the USB-GPIB?  How many instruments are attached and powered on?

 - How long is the total length of GPIB cable to the instruments?

What operating system?  What version of NI software drivers did you install?

Note there are reports of fake NI hardware that isn't supported by NI software - https://forums.ni.com/t5/Instrument-Control-GPIB-Serial/Genuine-NI-GPIB-USB-HS-warning-message/m-p/3...

Craig 

[JerryChen8888]

Actually, this problem is happen on my customer.

1. They are in China.

2. No any error message.

3. Use old system to Running, and confirm it is working well. Then change GPIB-USB from old to new once. After change to new once, it can't work again.

4. It is stand length on GPIB-usb cable. (We can't find any instrument include first once.)

5. My co-work had this problem long time ago. But he forgot how to solve it. He just remember that NI engineer came to solve in our company. He adjusted some parameter on NI's software(Should be NI max). This happened in Taiwan. 

Thanks,

[cstorey]

Still not much info to help solve your problem.  There should be error messages or more clues why things don't work.  What software is being used to test these?

There aren't many setting you can tweak with a GPIB controller.  But, if you plug a new (or second) USB-GPIB into an existing system it will assign that USB-GPIB Interface a new address (Default is GPIB0, next one is GPIB1, etc..)  Is that what is happening?  Software expects interface to be GPIB0, but because there were 2 plugged in when you remove the old one the new one is at GPIB1 not GPIB0? 

The only other setting of note is Bus Timing - https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z0000019YG5SAM&l=en-CA

Good luck.

Craig