Sorry, but I don't. If you have called $obj = Device::SerialPort->new(...), and not received a message telling you "can't open device: ...", then the port should be open and the handle obj->{FD} should be valid.
If the port failed to open during the new() call, then you would have received a null return from new() and your attempt to use $obj->{FD} in the call to binmode would have resulted in a "Use of uninitialized value in ref-to-glob cast at ..." message.
Without seeing the code you used, it is impossible to try and diagnose this further.
Examine what is said, not who speaks.
"Efficiency is intelligent laziness." -David Dunham
"When I'm working on a problem, I never think about beauty. I think only how to solve the problem. But when I have finished, if the solution is not beautiful, I know it is wrong." -Richard Buckminster Fuller
If I understand your problem, I can solve it! Of course, the same can be said for you.
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