Years ago I had to make a call to a Parallel Port using perl This is the code that I used. This was used to check if a radio station was broadcasting or not.. Hope this helps

use strict;
my $settings;

while (1 > 0 ) {
    $settings->{ports}->{status} = &CheckPort($settings);
          
    &SetStatus($settings);
}

sub CheckPort {
    my $parport = Device::ParallelPort->new('win32');
      $parport->set_control(32);
    #Grab values from DATA port
    my $data = $parport->get_bit(0);
    $data = $data . $parport->get_bit(1);
    $data = $data . $parport->get_bit(2);
    $data = $data . $parport->get_bit(3);
    $data = $data . $parport->get_bit(4);
    $data = $data . $parport->get_bit(5);
    $data = $data . $parport->get_bit(6);
    $data = $data . $parport->get_bit(7);
    return unpack("N", pack("B32", substr("0" x 32 . $data, -32)));
}
###########################################################
# Set the status of each port
###########################################################
sub SetStatus {
   my $settings = shift(@_);
   my $sendMail;
   my $station;
   my $stationNumber;
   my $writeStatus;

   my $number   = $settings->{ports}->{status};
   my $checkFor = $settings->{checkFor};

   # the port has 8 data registers.  if port 8 is low then we have 011
+11111 as a binary value.
   print "--[ If the port is not " . $checkFor . " then we have a prob
+lem\n";
  
   $bin = sprintf("%08b", $number);

   print "--[ sprintf result " . $bin . "\n";

   @chars  = unpack("A1" x length($bin), $bin);
 
   for( $i=0; $i <= $#chars; $i++) {
      # convert 
      $status = sprintf("%d", $chars[$i]);
      # $i + 1 is equivelent to the position on the port
      $stationNumber = ($i+1);

      # may not have a station for all ports
      unless (exists($settings->{ports}->{$stationNumber})) {next;} 

      # station id
      $station = $settings->{ports}->{$stationNumber}->{id};

      if ($status != $checkFor) {
        print "--[ houston we have a problem\n";

        $writeStatus = $settings->{statusBad};
        $color = $settings->{colorBad};
        $sendMail = 1;
      }else{
        print "--[ all ok \n";

        $writeStatus = $settings->{statusGood};
        $color = $settings->{colorGood};
        $sendMail = 0;
      }
       $settings->{ports}->{$stationNumber}->{status} = $writeStatus;
       $settings->{ports}->{$stationNumber}->{sendMail} = $sendMail;
       $settings->{ports}->{$stationNumber}->{color} = $color;
       print "--[ " . $station . " on port  " . $stationNumber . " is 
+" . $writeStatus . "\n";
 
   }
   return;
}
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