VXI Register-based versus Message-based Device Communications
DAQ application using LabView 8.6 communicating with VXI chassis with multiple cards (both register and message based devices). Register-based devices randomly stop communicating (after many hours at 200 scans/sec) while message-based devices continue to communicate. Currently searching for the cause and a resolution to the problem.
David,
Thanks so much for your response.
Our application (after initial setup and configuration of data communication cards in the 2 VXI chassis) enters an overall loop which contains many separate individual loops which carry out the data communication with the various individual cards. Some of these individual loops contain counters which increment each time through the loop. This overall loop continues until the operator interrupts it. We have been running the executable of the code so when we encounter the problem it is difficult to get much in the way of details of what's exactly happening. We are now planning on running the source code so if the problem occurs we could possibly get more information about what is happening.
1. By stop communicating I mean that the some of the counters that I mention above go to zero which indicates that particular loop is somehow "hung-up" and not incrementing the counter.
2. When we encounter the problem we have to exit the program, reboot the computer and start the program again. We have to reboot the computer because after the problem occurs we try to run Resman and we get the error "Unable to initialize ni-vxi driver". I researched this error and found information in the Resman Troubleshooting Guide which mentioned the possibility of a conflict between the NI-VXI device driver and some other memory resident program or device driver. The guide recommended adding lines to the config.sys and system.ini files to exclude the VXI device driver region of memory (0xD000 - 0xEFFF) from other device drivers (MS-OS). We did this but we still had the problem.
3. We have not tried changing the scan rate (currently 200 scans/second) for the cards but the problem occurs at very random times (anywhere from a few hours to 24+ hours).
V/R,
Craig
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