I've only used Device::SerialPort under Linux, but, your stated data format looks funny. 1 start bit is ok. 1 stop bit is ok. 8 data bits dictates no parity, not odd parity. Serial data bytes are 8 bits, not 11.

Sample code:

# Perl Polling Test

# Title: Perl to chipKIT Serial Poll Test
# Author: James M. Lynes, Jr.
# Version: 1.0
# Creation Date: June 10, 2012
# Modification Date: June 10, 2012

use strict;
use warnings;

# Initialize the serial port - creates the serial port object $Arduino

use Device::SerialPort::Arduino;

  my $Arduino = Device::SerialPort::Arduino->new(
    port     => '/dev/ttyUSB0',
    baudrate => 9600,
    databits => 8,
    parity   => 'none',
  );

while(1) {
  $Arduino->communicate('P');                     # Send a poll
  print ($Arduino->receive(), "\n");              # Print poll respons
+e
  sleep(1);                                       # Delay until next p
+oll
}
[download]

package Device::SerialPort::Arduino;

use strict;
use warnings;

use Time::HiRes;
use Carp;
use Device::SerialPort;

use vars qw($VERSION);

our $VERSION = '0.07';

sub new {
    my $class = shift;
    
    my $self = bless {}, $class;

    my %init = @_;

    # Sets many parameters for Device::SerialPort usage

    $self->{'port'}     = $init{'port'};
    $self->{'baudrate'} = $init{'baudrate'};

    $self->{'databits'} = $init{'databits'};
    $self->{'parity'}   = $init{'parity'};
    $self->{'stopbits'} = $init{'stopbits'};

    $self->initialize();

    return $self;
}

sub initialize {

    my $self = shift;

    $self->{'DSP'} = Device::SerialPort->new( $self->{'port'} )
      or croak "Can't open " . $self->{'port'} . " - $!\n";
[download]

James