Thanks for the help but when I run the code, it cannot calculate addition of members of @message

Argument "\0^I^A\0\0^H^A\0^A\0^X\0\0aM-^?^E\0 \0\0\0\0^A\0M-^?\0M-^D..
+." isn't numeric in addition (+) at VPAP_test.pl line 32.
Wide character in print at VPAP_test.pl line 37.
þ1Äý

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To be able to run it, I fixed some errors

#!/usr/bin/perl
use warnings;
use strict;
use IO::Socket;


my $SM = "\xfe";
my $ADRDSTN= "\x00\x09\x01\x00";
my $ADRSRC= "\x00\x08\x01\x00";
my $MID= "\x01";
my $MDLH= "\x00";
my $MDLL= "\x18";
my $SUBMID= "\x00";
my $CHreq= "\x00\x61";
my $Pity= "\xFF\x05";
my $Flags= "\x00\x20";
my $Timeout= "\x00\x00";
my $Level= "\x00\x00";
my $NumOfSrcEl= "\x01";
my $SrcEl= "\x00\xFF\x00\x84\x10\x00";
my $NumOfDstnEl= "\x01";
my $DstnEl= "\x08\x10\x00\x01\x01";
my $Rsvd= "\x00";
my @message= $ADRDSTN . $ADRSRC . $MID .$MDLH . $MDLL
           . $SUBMID . $CHreq . $Pity .$Flags . $Timeout
           . $Level . $NumOfSrcEl . $SrcEl . $NumOfDstnEl
           . $DstnEl . $Rsvd;
my $EM= "\xfd";


my $count=0;
$count += $message[$_] for 0..@message-1 ;
$count = 256 - ($count % 256);
my $CHECKSUM= chr( $count );
my @VPAP= $SM . @message . $CHECKSUM . $EM;

print  @VPAP,"\n";
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