#!perl

use strict;
use warnings;

use Win32::SerialPort;

my $port = Win32::SerialPort->new( "COM4" );
$port->user_msg(1);     # misc. warnings
$port->error_msg(1);    # hardware and data errors

$port->baudrate(19200);
$port->databits(8);
$port->stopbits(1);
$port->parity("none");
$port->read_const_time(1000);
#$port->stty_clear("0");
$port->pulse_dtr_on(300);

$port->write_settings;

my $baud = $port->baudrate;
my $parity = $port->parity;
my $data = $port->databits;
my $stop = $port->stopbits;
my $hshake = $port->handshake;

print "B = $baud, D = $data, S = $stop, P = $parity, H = $hshake\n";

undef $port; 

__END__
liefert bei mir:
B = 19200, D = 8, S = 1, P = none, H = rts