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$packet_out = 4;
On the serial wire: 0x34 (which is ASCII code for character 4)
...

$packet_out = 0x65;
On the serial wire: 0x31 0x30 0x31 (which, bizarrely, is ASCII code fo
+r '101' which is a string of the decimal ASCII code for 'e' which has
+ the ASCII code 0x65)

unless (open ($SERIALPORT, "+<", $comport)) {die "Cannot open $comport
+: $!"}
system("stty -cstopb hupcl ignbrk -iexten -echo -echoe -echok " . 
    "-echoctl -echoke -crtscts -ignpar cs8 9600 time 5 -icrnl " .
    "-ixon -opost -isig -icanon -F $comport");
die unless binmode($SERIALPORT, ':raw:bytes'); #numerous variations tr
+ied