--- 3m-810.pl	2010/02/09 14:52:13	62
+++ 3m-810.pl	2010/02/11 10:52:14	63
@@ -121,6 +121,7 @@
 					next unless $p =~ m/^tag_(\S+)/;
 					my $tag = $1;
 					my $content = "\x04\x11\x00\x01" . $param->{$p};
+					$content = "\x00" if $param->{$p} eq 'blank';
 					$status = 302;
 
 					warn "PROGRAM $tag $content\n";