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  1. or download this
    open(Client,"+>/dev/ttyUSB0") || die "open: $!";
use IO::Stty;
...
IO::Stty::stty(\*Client,"19200");
IO::Stty::stty(\*Client,"-echo");
IO::Stty::stty(\*Client,"-icrnl");
  2. or download this
    IO::Stty::stty passed invalid parameter 'crtscts'
Can't use string ("POSIX::B19200") as a subroutine ref while "strict r
+efs" in use at /usr/share/perl5/IO/Stty.pm line 567.