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  1. or download this
    my ($receivedBytes, $data) = $HandleToRS232->read();
  2. or download this
    my ($receivedBytes, $data) = $HandleToRS232->read_bg();
  3. or download this
    my($done, $count_in, $string_in) = $HandleToRS232->read_done(1);
  4. or download this
    my ($result) = Win32API::CommPort::ReadFile(
$HandleToRS232,$data,$NumberOfBytesToRead,
$ActualReadBytes,$template);