BOUNCING VISA Write error - hair pulling

Running an application that uses some standard features.  Lies in stepper motor which is controlled by simply sending chains of command to the inverter via a serial connection.

Update for Windows 7 (from XP) and thus to level to 2013 LV.    Now all of a sudden I get errors of the vi that writes to the port series. He'll sometimes for a few hours before appearing, sometimes 15 minutes.  There is not much consistency as to which iteration of the vi pops up the error.  I added delays here and there, put a delay in writing vi (attached), added a clear before writing pad, etc, etc.  This bug won't go away.  This is the error that appears...

I have attached the vi.  It is about as simple as they come that's why I'm pulling what little hair I have left.  Two changes in this version of the original that ran forver on XP, the delay of 150ms between writing and close System (since door to 400) and I also changed the time-out on the configuration of ms 10000 to 5000 ms (10s and 5s).

Once this happens then all series the connection with the computer is watered and I have to restart the system to get there again.  The computer, a relatively new dell, has a port built series ini and I use an expansion card StarTech for two additional ports. (2-port PCIe RS232 w / UART 16550)

ANY help is very appreciated on what having to reset the system 10 - 15 times a day is killing me.

Tags: NI Software

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