VISA read Problem: After a while the device stop responding
Hi everyone,
I am facing a really strange bug that anything that I have done could not solve it. I have a PIC device that I made myself communicating with LabVIEW by a RS232 -> USB converter. Everything seems to be ok, but suddenly (it can last 30, 45 or 50 seconds), LabVIEW stops receiving data and any buttons do not respond anymore, not even the stop button. I have to remove the usb converter to get the buttons to respond again, and then I got the error:
Other programs that opens this same terminal can communicate with my device for hours without errors. I sure open the session and only close after the while loop. Can anybody help me?
Solved!
Go to Solution.
Hello,
Same problem for me! It can last 1 hour or 5 hours but at some point the two parts of the program that have a RS-485 to usb stop. This program was working perfectly until I changed the computer. The OS was vista (32 bits) and it is now 7 (64 bits). This is the only thing that has changed.
I also found that if more parts of the program are running this problem appears earlier. It was definitely not issue before since the program could be running for weeks.
Thanks for your help.
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VISA Read over USB Problem: After a while the xBFFF0015 Timeout Error occurred
Hi,
I have trouble using labview with my non-NI USB device:
The device is an analog input DAQ board. I was able to setup communication with the board using a VISA driver specifically created for this board and direct FW calls using the product's firmware specification provided by the manufacturer.
This method has been working pretty good so far, but when I try to get large amount of data (64k samples @100ksps), the VISA Read returns the 'VISA: (Hex 0xBFFF0015) Timeout expired before operation completed.' error.
Please see the attached screenshot of the block diagram for details.
First, an 'analog input scan start' command is sent to the DAQ device, and then the vi tries to read all collected data from the device, once the right amount of data retrieved, or no more data is available the data collecting process (the while loop) ends and an 'analog input scan stop' command is sent to the DAQ device.
The data collection starts with no problem, but after a while, in loop# 400, the VISA Read hangs and then returns the error mentioned above.
I tried to increase the time out value, but it didn't help, the error occurred after the same number of loops, the VISA Read got hosed and the error occurred after the longer timeout expired.
I also tried to add some delays in the loop, but it didn't help either.
I am not sure what do I miss here and I would highly appreciate if anyone could give me some guidance how to solve this issue.
Thanks,
John
Attachments:
usb-read.png 18 KBI just wanted to specify that this is not an NI board avoiding to make people think this is a hardware issue. And I think that the rest of the code is irrelevant in this case.
I believe that I don't use the VISA functions correctly. I assumed that someone who used these functions before would be able to point out the obvious steps missing in the data collecting process using the VISA functions. -
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http://support.apple.com/kb/ht1430
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