Windows GetCommError Cose xF9C0

[Valen Li]

Hi,
I developed a labview 6.0.2 application to test a UUT via the USB Port on a PC with Win2000. On the PC, a PCI serial card is used for COM1, an external USB to Serial adapter is used for COM2. After the test program initializes COM1 and COM2 and the DMMs connected to them, and when the program tried to talk to the UUT via the USB port, A Windows GetCommError code xF9C0 came up. Can this error caused by the USB Serial Adapter? Or it is a windows driver or labview related issue? Your hints are appreciated. BTW, my application is generated on a Windows 98 PC, will it matter?

[Ray K]

Any USB-serial adapter should have a driver that emulates the behavior of the native windows serial driver and you should be able to access the serial port as if it is a native com port (ie the usb layer should be transparent). If this is not the case, you should contact the manufacturer of the USB-Serial device.


BTW The error message denotes that the error occurred at "USB-Port Open.vi". This seems to indicate that you are accessing the USB port directly. You should be accessing COM2 through VISA and not be accessing the USB port itself.