Upd Post fixed, this is redundant.

Please use <code> tags around your code. It will look better:

#!C:/Program Files/ActivePerl/ActivePerl/perl/bin -w 
# This is an example file showing how to send data to the serial port.
# 
# It does not include error checking. 
# 
use strict; 
#use Device::SerialPort; # on UNIX 
use Win32::SerialPort; # on Windows 
sub openPort($); 
sub closePort($); 
#my $DEVICE = "/dev/ttyS1"; # on UNIX 
my $DEVICE = "COM1"; # on Windows 
my $serial = openPort($DEVICE); 
$serial->write("Hello World"); 
closePort($serial); 

#*********************************************************************
+***** 
#* Serial functions 
#*********************************************************************
+***** 

#* Open raw serial port using: 
#* 8 data bits 
#* 1 stop bit 
#* 19200 bps 
#* no parity 

sub openPort($) 
{ 
    my ($device) = @_; 
    #my $serial = Device::SerialPort->new ($device, 1); # on UNIX 
    my $serial = Win32::SerialPort->new ($device, 1); # on Windows 
    die "Can't open serial port $serial: $^E\n" unless ($serial); 
    $serial->user_msg(1); 
    $serial->databits(8); 
    $serial->baudrate(19200); 
    $serial->parity("none"); 
    $serial->stopbits(1); 
    $serial->handshake("rts"); 
    return $serial; 
} 

sub closePort($) 
{ 
    my ($serial) = @_; 
    $serial->close(); 
}
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