BrowserUK, You idea solved the problem. I was able to check the status of the com port before and after running different programs and using the copy to port mechanism.

What I found was that I was using xoff for handshaking and when I changed that to none the additional characters come through Win32::SerialPort. Looks like xoff handshaking handles certain bytes differently.

Thanks for the guidance.

Mike

In reply to Re^4: Win32:SerialPort not reading all characters by sxmwb
in thread Win32:SerialPort not reading all characters by sxmwb

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