In the example that you have shown the characters are in decimal and not hex. To convert them use chr:
#!/usr/bin/perl -wl
my @nums = qw(84 67 49 67 83 50 79);
my @chars = map {chr} @nums;
print join '', @chars;
__END__
Prints:
TC1CS2O
If the numbers were in hex you could convert them with hex:
my @chars = map {chr hex} @nums;
--
John.
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