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Topic:   A strange Error

By: Rob ConleyPosted on: Aug 4 2010 at 04:01:05 PM
Occasionally we this following error while using USB Serial Ports

MSComm Serial Error 8021 “Internal error retrieving device control block for the port”

Shutting down the software and restarting cures the problem.

Would Comm32 help with this type of error?

By: SupportPosted on: Aug 5 2010 at 02:25:04 PM
Unfortunately we can't say what causes the error with mscomm32. It seems this error is more common when mscomm32 is used with virtual com ports.

All I could say is that you should try with the trial version of Comm32. If there is a problem with the hardware Comm32 might not work either but you may get a more informative error message.

Comm32 also has other properties which can detect whether hardware exists or not and even if the hardware doesn't exist it will tell you if drivers are installed etc so might be easier to diagnose your problem.

By: GuestPosted on: Jan 15 2020 at 04:49:18 AM
runtime error 8021,Internal error retrieving device control block for the port, what can I do for it?

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