I'm using Perl to write to a series of serial ports. I have 20 ports, numbered COM1 ... COM20. I can write to ports COM1 ... COM9 just fine, but ports COM10 to COM20 generate the following error...

The system can not find the file specified. Can't open device COM10

The line it dies on is... 
my $ob = Win32::SerialPort->new ('COM10') || die;

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Any ideas?

In reply to Com ports over COM9 by John Whitney

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