This code produces the answer - you should be able to incorporate the idea into your code.
perl -e '@x=qw| 28 8a 1c 59 cc 85|;
my $o="";
for (my $i=0; $i<$#x; $i+=2){
$o.=$x[$i].$x[$i+1]."."}
chop $o;
print "$o\n"'
288a.1c59.cc85
Update: Fixed typo in code above, to produce right answer.
There are other, slightly more elegant methods (using natatime from List::MoreUtils), but to use those, you will need to use CPAN modules.
Here is another option (Has trailing "."):
perl -e '@x=qw| 28 8a 1c 59 cc 85|;
while ($_=shift @x){
print "$_" .shift (@x) . "."}'
Note -: This one destroys the source array.
This is not an optical illusion, it just looks like one.
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