I have a system with 4 tasks (VI's). One to read data, one to crunch the data, one to log the data, and one to display the data. They are designed to run on a PXI computer system. When I run them from the labview development enviornment (they still run on the PXI system this way) everything works fine. When I build them into a real time executable and set up the PXI computer to load the executable at startup the data acquisition VI no longer works. The VI is designed to run at a rate of 20 Hz. It reads data from both a serial port and a analog input board. When I run it from the IDE it works fine. In the real time executable it sometimes reads the data, but the serial port does not work. Because I'm using VISA to read from the serial port the user must select the port from a drop down box (Visa Resource Name). This drop down box does not get populated when the VI is a part of the RT executable, but does populate when run from the IDE. I've also had a lot of problems where the VI would stop reading data altogether, but only when it is run from the RT executable. Some things I have tried that sometimes make a difference is that I now store the RT executable and all of its helper files in C:\ni-rt\system and added a 5 second delay at the beginning of the VI.. I have also seen this error message in the log.
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#Date: Fri, Jun 16, 2006 1:23:13 PM
#OSName: PharLap
#OSVers: 12.0
#AppName: PH_EXEC
#Version: 8.0.1
#AppKind: AppLib
LVRT.DLL reference address: 0x002F8BAA
I have reinstalled the OS on the PXI which helped get the data back, but I still have the problem with the VISA Resource Name. Is there any way I can put a constant in the block diagram instead of using the VISA Resource Name drop down box? What could be causing the problems I'm seeing?
