Sending a data string from Perl script that requires Start (0x02) and End (0x03) of Text data string layout is 

 
####    STX                          1 byte (0x02)
####    byte count                   8 bytes, leading zeros, inclusive
+ of wrapper (payload length + 18)
####    reserved                     8 bytes, all zeros (required and 
+reserved for future use)
####    payload                        (Data record to send)
####    ETX                          1 byte (0x03)

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Results of code below are not STX = 0x02 and ETX = 0x03 but $hex02_ascii = E2 98 BB $hex02_ascii = E2 99 A5 example: ☻0000052500000000<payload>♥ Note "byte count" is correct as is the "reserved" 

 
my $hex02 = 0x2; 
my $hex03 = 0x3;
my $hex02_ascii = sprintf "%c", $hex02;
my $hex03_ascii = sprintf "%c", $hex03;
my $MsgLgth = 0;
my $Message = " ";

chomp $Message;    
$Message = $_;    

# Calculate Length of Message
$MsgLgth = length($_)+18;
  
if ( $MsgLgth < 100 ) {
$Message = $hex02_ascii . '000000' . $MsgLgth . '00000000' . $Message 
+. $hex03_ascii;
}elsif ( $MsgLgth < 1000 ) {
$Message = $hex02_ascii . '00000'  . $MsgLgth . '00000000' . $Message 
+. $hex03_ascii;
}elsif ( $MsgLgth < 10000 ) {
$Message = $hex02_ascii . '0000' .   $MsgLgth . '00000000' . $Message 
+. $hex03_ascii;
}elsif ( $MsgLgth < 100000 ) {
$Message = $hex02_ascii . '000' .    $MsgLgth . '00000000' . $Message 
+. $hex03_ascii;
}elsif ( $MsgLgth < 1000000 ) {
$Message = $hex02_ascii . '00' .     $MsgLgth . '00000000' . $Message 
+. $hex03_ascii;
}else{
# Max length is 300000
# If hit here, too long ... by a LOT
print "Formated Message exceeds MaxMessageLength\n\n";

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In reply to Help adding STX and ETX to data string in Perl by CuriousMark

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