Hi,
I am trying to get the stored data in the 34972A via the USB interface, but I can only get a couple of scans and then the software stops communicating with the 34972A. I have tested the software with interfaces such as: RS232, GPIB for 34970A LAN for 34972A and all work, I have been able to get the stored data from the equipment. When I try to use the USB interface, I could control all the functions in the equipment, but when i am about to download the data, I could only get a few readings and then I loose communication. I have also use NI MAX to send the FETCh? command and then start reading the data... I get the same problem after exactly the same number of readings.. The last read before the error reads the following in my program: ..... ,-9.90000000E+37,2012,08,16,14,37,12.017,205,0,-9.90000000E+37,2012,08,16,14,37,12.055,206,0,-9.90000000E+37,2012,08,16,14,37,12.094,207,0,-9.90000000E+37,2012,08,16,14,37,12.1??? .... in NIMAX .... ,-9.90000000E+37,2012,08,16,14,37,12.1\x98\xFA\xDA\x00\x05\x00\00\x00\n ....
The software was developed using the following: Windows 7, C#, NIVISA (latest version).
I am sending the FETCh? Command and reading back the stored data.
I tried the FETCh? Command using the LAN interface and it works great.
In the 34970A I tried the FETCh? Command with RS232 and GPIB and it worked well.
Now I was trying to use the USB interface, but it starts getting the data okay and after a couple of bytes it stops and NIVISA times out.
It is weird that the same library same software works well with all the other interfaces, but not USB.
All other commands like setting up the channels, scanning list, etc. all work fine using all interfaces. Only when I need to retrieve lots of data the USB interface starts okay, but eventually times out.
Please help.
