Unable to read the string

Hi this is Arun here, i am new to perl.Here i am trying to read a
string from the serial port but i am not able to and this is my
program:

# Read serial port until message or timeout occurs
sub ReadPort($$$) {
(my $String, my $TimeOut, my $Display) = @_;
$ob->read_const_time($TimeOut); # Setup timeout value in mS
my $Reply = ""; # Initialize message
do {
($Count, $Result) = $ob->read(1); # Read serial port
$Reply .= $Result; # Build message
print "$Result" if ($Display); # Display messages if enabled
} while($Count > 0 and $Reply !~ m/$String/);
print "\n" if ($Display); # Put carriage return at end of
displayed output
if ($Reply !~ m/$String/) {
print "ERROR: Read timed out waiting for '$String' \n";
return(1);
}
return($Reply);


So just needed help for the above program to be solved.

.

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