Or use perl itself for a rudimentary dump of the stream: 
echo "ATDT123456 \r\nBUSY" | perl -e 'local $/=undef;@chars=split //, 
+<STDIN>; for(@chars) {print $_ . " " . ord($_) . "\n"; }'

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In reply to Re^4: Regex Help by eXile
in thread Regex Help by Dru

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