What do you mean by saying "I set the Serial ActiveX setting"?
>>> I mean the setting of baud rate and other properties is like picture below:
What exactly do you do and how?
For the first time it runs well. But after several times open and close the port, the Activex Control throw an error code 12 and 0
In what scenario does the problem occur?
I don't know yet what trigger this error. I suspect it has something to do with the data that supplied from the comport.
How can we verify it on our side?
For now I can temporary fix it by change the Databits value from 7 to 8.
Open the port and close again (manually, using UI). Change the Databits value back from 8 to 7. Open the port, the data will back to normal again and the error not shown.
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>>> (-.- )! I forgot to download the priority_support_email.PDF file
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>>> Okay. Thanks for your advice.