Place the two statements $PortObj->error_msg(1); $PortObj->user_msg(1); before the initialization (i.e. just after new). Also, please follow all of the advice from this node.

Also, this thread is starting to sound incredibly similar to this one, in which the problem was reportedly solved by using 32-bit Strawberry Perl instead of 64-bit. Another user reported similar problems.

In reply to Re^3: can't write-Win32::SerialPort by Anonymous Monk
in thread can't write-Win32::SerialPort by franko

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