Visa error code -1073807299

[Bhongtip]

I use 4 comports in my program, 2 from computer mainboard and the other 2 from PCI com port card.

I got error from pci comport card whe visa flush/set buffer size. The error code is -1073807299.  There is no such error report on comport from computer mainboard. 

Is there anyone has such experience?  

What could be potential root cause and how can I fix it?

Thank you in advance.

Boonserm H.

[crossrulz]

Help->Explain Error

That error states "Invalid buffer mask specified."  Please share your code so we can examine it and help find your issue.

[Bhongtip]

The whole vi file size is big so I captured only portion that error take place.

[crossrulz]

I'm left to assume there is something wrong with your serial port card and/or its drivers.  Your flush VI worked just fine in my system.  But you have something from Comtrol, which I had a bear of a time getting one of their devices to work (Ethernet-Serial port hub).  And the tool you are using has a copyright of 2014, so you should see if there is an updated driver.

[Martin_Henz]

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@crossrulz wrote:

I'm left to assume there is something wrong with your serial port card and/or its drivers.

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That`s the point. An updated driver may solve this isse.

I also think, that VISA is doing some magic staff before or after calling the windows API function PurgeComm inside "VISA Flush I/O Buffer". Have you tried the other options ("Flush Receive Buffer (No I/O)" instead of "Flush Receive Buffer").

For "VISA Set I/O Buffer Size" try "I/O Receive and Transmit Buffer" instead of "I/O Transmit Buffer" because the windows API function SetupComm always needs both buffer sizes (receive and transmit buffer). Try much smaller buffer sizes.